Muscular Fitness and Cardiovascular Risk Factors in Children and Adolescents: A Systematic Review
Rodrigues de Lima, T, Custódio Martins, P, Henrique Guerra, P, and Augusto Santos Silva, D. Muscular fitness and cardiovascular risk factors in children and adolescents: A systematic review. J Strength Cond Res 34(8): 2394–2406, 2020—The purpose of this study was to identify and summarize the relationships between muscular fitness (MF) and individual components of metabolic syndrome (high waist circumference [WC], high blood pressure [BP], high systolic BP [SBP], high diastolic BP [DBP], high triglycerides [TG], fasting blood glucose [FG], and low HDL cholesterol levels [HDL-C]) in children and adolescen...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Women's Football: An Examination of Factors That Influence Movement Patterns
Griffin, J, Larsen, B, Horan, S, Keogh, J, Dodd, K, Andretta, M, and Minahan, C. Title: Women’s football: An examination of factors that influence movement patterns. J Strength Cond Res 34(8): 2384–2393, 2020—The popularity and professionalism of women's football has increased in conjunction with participation rates over the last 10 years, with projected female participation rates to double worldwide by 2026. Scientific interest has also increased, in part due to Fédération Internationale de Football Association now allowing global positioning system (GPS) units to be worn during all competi...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

The Influence of Movement Tempo on Acute Neuromuscular, Hormonal, and Mechanical Responses to Resistance Exercise—A Mini Review
Wilk, M, Tufano, JJ, and Zajac, A. The influence of movement tempo on acute neuromuscular, hormonal, and mechanical responses to resistance exercise—a mini review. J Strength Cond Res 34(8): 2369–2383, 2020—Resistance training studies mainly analyze variables such as the type and order of exercise, intensity, number of sets, number of repetitions, and duration and frequency of rest periods. However, one variable that is often overlooked in resistance training research, as well as in practice, is premeditated movement tempo, which can influence a myriad of mechanical and physiological factors associated wi...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Determining Maximal Muscle Strength in Mice: Validity and Reliability of an Adapted Swimming Incremental Overload Test
Gouvêa, AL, Martinez, CG, and Kurtenbach, E. Determining maximal muscle strength in mice: validity and reliability of an adapted swimming incremental overload test. J Strength Cond Res 34(8): 2360–2368, 2020—At present, there are no reliable methods to determine maximal muscle strength in small rodents. Here, we established an adapted swimming incremental overload test (SIOT) as an instrument for this purpose. First, to validate the test, BALB/c mice received 20 mg·kg−1·d−1 of dexamethasone (DEXA group) or water (control group). After 14 days, with a cumulative dose of 120 mg&mid...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Methodological Reports Source Type: research

Modeling Fitness Variable Responses to Training in Prepubescent Children
Alves, AR, Marta, C, Neiva, HP, Nunes, C, Izquierdo, M, and Marques, MC. Modeling fitness variable responses to training in prepubescent children. J Strength Cond Res 34(8): 2352–2359, 2020—The aim of this study was to determine strength and oxygen uptake (V̇o2max) performances according to different training program intervention design with 8-week duration in prepubescent children through a multiple linear regression models. Two hundred forty-five healthy prepubescent children (aged 10.9 ± 0.5 years) were randomly assigned to a specific training program (strength training only—S; aerobic training...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Short Research Report Source Type: research

Different Foot Positioning During Calf Training to Induce Portion-Specific Gastrocnemius Muscle Hypertrophy
Nunes, JP, Costa, BDV, Kassiano, W, Kunevaliki, G, Castro-e-Souza, P, Rodacki, ALF, Fortes, LS, and Cyrino, ES. Different foot positioning during calf training to induce portion-specific gastrocnemius muscle hypertrophy. J Strength Cond Res 34(8): 2347–2351, 2020—The aim of this study was to compare the changes in gastrocnemius muscle thickness (MT) between conditions such as which foot was pointed outward (FPO), foot was pointed inward (FPI), or foot was pointed forward (FPF). Twenty-two young men (23 ± 4 years) were selected and performed a whole-body resistance training program 3 times per week for 9 ...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Short Research Report Source Type: research

Effect of the Fatigue on the Physical Performance in Different Small-Sided Games in Elite Football Players
Calderón Pellegrino, G, Paredes-Hernández, V, Sánchez-Sánchez, J, García-Unanue, J, and Gallardo, L. Effect of the fatigue on the physical performance in different small-sided games in elite football players. J Strength Cond Res 34(8): 2338–2346, 2020—Football players need to be able to perform high-intensity efforts of short duration with brief recovery periods. The aim of this study was to analyze the influence of the pitch dimension on high-intensity actions and the effect of a repeated sprint ability (RSA) test on the physical performance in different 4-against-4 (4v4) sma...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Sex Differences in Physical Capacities of German Bundesliga Soccer Players
Cardoso de Araújo, M, Baumgart, C, Jansen, CT, Freiwald, J, and Hoppe, MW. Sex differences in physical capacities of German Bundesliga soccer players. J Strength Cond Res 34(8): 2329–2337, 2020—Sex differences in physical capacities of elite soccer players have received limited attention. Therefore, this study investigated sex differences in linear and nonlinear sprint, squat and countermovement jump, core endurance, as well as incremental and intermittent endurance capacities in German Bundesliga soccer players. A total of 76 field players (29 women) were tested for the mentioned anaerobic- and aerobic-...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Physical Characteristics of Elite Youth Female Soccer Players Characterized by Maturity Status
Emmonds, S, Scantlebury, S, Murray, E, Turner, L, Robsinon, C, and Jones, B. Physical characteristics of elite youth female soccer players characterized by maturity status. J Strength Cond Res 34(8): 2321–2328, 2020—The purpose of this study was to investigate the influence of maturity status on the physical characteristics of youth female soccer players. One hundred fifty-seven players from 3 elite soccer academies in England completed assessments of anthropometry, strength (isometric midthigh pull), lower-body power (countermovement jump [CMJ]), aerobic capacity (Yo-Yo intermittent recovery test level 1), cha...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Monitoring Wellness, Training Load, and Running Performance During a Major International Female Field Hockey Tournament
McGuinness, McMahon, G, A, Malone, S, Kenna, D, Passmore, D, and Collins, K. Monitoring wellness, training load, and running performance during a major international female field hockey tournament. J Strength Cond Res 34(8): 2312–2320, 2020—The current observational study quantified players' activity profiles during a major international female field hockey tournament and determined whether an association exists between well-being measures and running performance within elite female hockey players. Elite female field hockey players (23 ± 3 years; 162.6 ± 13 cm; and 66 ± 6 kg) participated i...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Association of Functional Screening Tests and Noncontact Injuries in Division I Women Student-Athletes
Warren, M, Lininger, M, Smith, CA, Copp, A, and Chimera, NJ. Association of functional screening tests and noncontact injuries in Division I women student-athletes. J Strength Cond Res 34(8): 2302–2311, 2020—To determine the association between functional screening tests and lower-body, noncontact injuries in Division I women basketball, soccer, and volleyball student-athletes (SA). Sixty-eight injury-free women SA (age: 19.1 ± 1.1 years, height: 171.3 ± 8.7 cm, and mass: 68.4 ± 9.5 kg) were tested preseason with single hop (SH), triple hop (TH), and crossover hop (XH) for distance, and iso...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Relationship Between Repeated Kicking Performance and Maximal Aerobic Capacity in Elite Junior Australian Football
Joseph, J, Woods, C, and Joyce, C. Relationship between repeated kicking performance and maximal aerobic capacity in elite junior Australian football. J Strength Cond Res 34(8): 2294–2301, 2020—Australian football (AF) is a physically demanding game, requiring players to engage in a range of anaerobic activities interspersed with prolonged aerobic exercise. Coupled, players have to perform a range of technical skills, the most fundamental of which being to effectively kick (dispose) the ball. The aim of this study was to ascertain the extent to which aerobic capacity influenced kicking performance in AF. Twenty...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Monitoring Changes in Power, Speed, Agility, and Endurance in Elite Cricketers During the Off-Season Period
Herridge, R, Turner, A, and Bishop, C. Monitoring changes in power, speed, agility, and endurance in elite cricketers during the off-season period. J Strength Cond Res 34(8): 2285–2293, 2020—The purpose of this study was to monitor changes in power, speed, agility, and endurance in elite cricketers during the 20-week off-season period. Fourteen elite male cricketers (age 26.2 ± 5.3 years; height 180.8 ± 8.5 cm; mass 83.5 ± 6.7 kg) conducted a physical testing battery in week 1 and week 18 of the off-season period. The testing included a yoyo intermittent recovery test, bilateral and unilate...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Endurance Exercise Bouts in Hypoxia, Hyperoxia, and Normoxia on mTOR-Related Protein Signaling in Human Skeletal Muscle
This study investigated the effects of short-term hypoxia (HY), hyperoxia (PER), and normoxia on anabolic signaling proteins in response to an acute bout of moderate endurance exercise (EEX) before and after an endurance exercise training intervention. Eleven healthy male subjects conducted one-legged cycling endurance exercise (3 × 30 min·wk−1 for 4 weeks). One leg was trained under hypoxic (12% O2) or hyperoxic conditions (in a randomized cross-over design), and the other leg was trained in normoxia (20.9% O2) at the same relative workload. Musculus vastus lateralis biopsies were taken at baseline (T0)...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of an Upper-Body Training Program Involving Resistance Exercise and High-Intensity Arm Cranking on Peak Handcycling Performance and Wheelchair Propulsion Efficiency in Able-Bodied Men
Chaikhot, D, Reed, K, Petroongrad, W, Athanasiou, F, van Kooten, D, and Hettinga, FJ. Effects of an upper-body training program involving resistance exercise and high-intensity arm cranking on peak handcycling performance and wheelchair propulsion efficiency in able-bodied men. J Strength Cond Res 34(8): 2267–2275, 2020—The aim of this study was to determine the training effects of an upper-body training program involving resistance exercise and high-intensity arm cranking on peak handcycling performance, propulsion efficiency, and biomechanical characteristics of wheelchair propulsion in able-bodied men. The t...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Physiological Adaptations to High-Intensity Interval and Continuous Training in Kayak Athletes
This study compared physiological adaptations with HIIT and CT in flat water kayak athletes. Twenty-four national-class kayakists were divided into 3 groups (n = 8 per group), 2 of which participated in an 8-week CT or HIIT program, whereas the third one served as control (C). An incremental maximum oxygen uptake (V̇o2max), a maximal anaerobic Wingate-type, as well as 1,000-m (T1,000 m) and 200-m (T200 m) time test were performed before and after the training period on a kayak ergometer, to determine changes in V̇o2max, peak blood lactate ([La+2]peak), paddling speed at V̇o2max (JOURNAL/jscr/04.03/00124278-202008000-000...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Use of Visual Feedback During Jump-Squat Training Aids Improvement in Sport-Specific Tests in Athletes
This study investigated the effects of instantaneous performance feedback during the jump-squat exercise over a 6-week training period. Twenty-five strength-trained athletes were randomly divided into an instant feedback (n = 13, half-squat 3-repetition maximum (3RM)/body mass = 2.38 ± 0.19) or a nonfeedback (n = 12, half-squat 3RM/body mass = 2.03 ± 0.44) group. Both groups performed the same training program (3 × week), consisting of 4 sets of 8 repetitions (weeks 1–3) and 8 sets of 4 repetitions (weeks 4–6) using a barbell with a load that maximized the average concentric power output (Pm...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Acute Effects of Interset Rest Duration on Physiological and Perceptual Responses to Resistance Exercise in Hypoxia
This study aimed to determine whether manipulating interset rest periods during resistance training in hypoxia impacts on physiological and perceptual responses to exercise. Twelve healthy males completed 1 repetition maximum (1RM) testing for the bilateral leg extension, before completing 4 separate randomized trials comprising 5 × 10 repetitions of leg extensions at 70% 1RM. Experimental trials were completed in both moderate hypoxia (FIO2 = 15%) and normoxia (FIO2 = 21%), using interset rest periods of both 60 and 180 seconds for each environmental condition. Near-infrared spectroscopy was used to quantify muscle ...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Acute Effects of Different Rest Intervals Between Sets of Resistance Exercise on Neuromuscular Fatigue in Trained Older Women
Jambassi Filho, JC, Gurjão, ALD, Prado, AKG, Gallo, LH, and Gobbi, S. Acute effects of different rest intervals between sets of resistance exercise on neuromuscular fatigue in trained older women. J Strength Cond Res 34(8): 2235–2240, 2020—The aim of this study was to investigate the acute effect of different rest intervals (RIs) between sets on total volume, time under tension, maximal voluntary contraction (MVC), and integrated electromyography (iEMG) activity of the vastus lateralis (VL) and vastus medialis (VM) muscles. Twenty-one resistance-trained older women (66.4 ± 4.4 years; 69.1 ±...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Comparison of Mechanical Outputs Between the Traditional and Ballistic Bench Press: Role of the Type of Variable
This study aimed to comprehensively explore the differences in mechanical outputs between the bench press (BP) and the bench press throw (BPT) exercises performed by 21 men (age: 22.0 ± 4.2 years, body mass: 73.4 ± 7.7 kg, height: 177.2 ± 8.0 cm, and concentric-only [C-O] BP 1 repetition maximum: 81.3 ± 6.8 kg) against a fixed external load of 27 kg using both the (C-O) and eccentric-concentric (E-C) execution techniques. The types of variables collected by means of a linear velocity transducer were the traditional mean values (i.e., from the first positive velocity until the barbell reaches max...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Acute and Delayed Effects of a Resistance Training Session Leading to Muscular Failure on Mechanical, Metabolic, and Perceptual Responses
This study explored the acute and delayed (24 and 48 hours after exercise) effects of a resistance training session leading to muscular failure. Eleven resistance-trained men completed a training session consisting on 3 sets of repetitions to failure during the back-squat exercise performed at the maximum possible speed with a load equivalent to a mean propulsive velocity (MPV) of 1 m·s−1 (≈60% of 1 repetition maximum). A number of mechanical (number of repetitions and starting MPV of the set, MPV achieved against the 1MPV load, countermovement jump [CMJ] height, and handgrip strength), metabolic (lactat...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Influence of Adding Single-Joint Exercise to a Multijoint Resistance Training Program in Untrained Young Women
Barbalho, M, Gentil, P, Raiol, R, Fisher, J, Steele, J, and Coswig, V. Influence of adding single-joint exercise to a multijoint resistance training program in untrained young women. J Strength Cond Res 34(8): 2214–2219, 2020—The aim of the present study was to investigate the effects of adding single-joint (SJ) exercises to a multijoint (MJ) resistance training (RT) program on muscle strength and anthropometric measures of young women. Twenty untrained women were divided into a group that performed only MJ exercises or a group that performed both SJ and MJ exercises (MJ + SJ). Before and after 8 weeks of train...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Eight Weeks of Strength and Power Training Improves Club Head Speed in Collegiate Golfers
Oranchuk, DJ, Mannerberg, JM, Robinson, TL, and Nelson, MC. Eight weeks of strength and power training improves club head speed in collegiate golfers. J Strength Cond Res 34(8): 2205–2213, 2020—Club head speed (CHS) is a major determinant of drive distance, a key component of golf performance. The purpose of this study was to determine the indirect effects of an 8-week strength and power program on CHS. Twelve (6 men, 6 women) NCAA Division II golfers (20.3 ± 1.5 years) randomly assigned to an intervention or control group underwent either a periodized strength and power program consisting of high-load b...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Reliability and Validity of a New Portable Tethered Sprint Running Test as a Measure of Maximal Anaerobic Performance
In conclusion, our results suggest that despite insufficient stimulation of anaerobic metabolism in some subjects resulting from poor implementation of test instructions, the PTSR is a reliable and valid test for an easy and practical assessment of maximal anaerobic performance under different field conditions. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Different Training Interventions on the Recovery of Physical and Neuromuscular Performance After a Soccer Match
Trecroci, A, Porcelli, S, Perri, E, Pedrali, M, Rasica, L, Alberti, G, Longo, S, and Iaia, FM. Effects of different training interventions on the recovery of physical and neuromuscular performance after a soccer match. J Strength Cond Res 34(8): 2189–2196, 2020—In competitive soccer, players are frequently required to play in periods with congested fixtures in which they have limited time to recover between matches (3–4 days). Thus, finding the most appropriate intervention strategy to limit players' neuromuscular (muscle function of lower limbs) and physical (running performance) impairments in this shor...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

The Effect of 12 Weeks of Different Exercise Training Modalities or Nutritional Guidance on Cardiometabolic Risk Factors, Vascular Parameters, and Physical Fitness in Overweight Adults: Cardiometabolic High-Intensity Interval Training-Resistance Training Randomized Controlled Study
Ramírez-Vélez, R, Castro-Astudillo, K, Correa-Bautista, JE, González-Ruíz, K, Izquierdo, M, García-Hermoso, A, Álvarez, C, Ramírez-Campillo, R, and Correa-Rodríguez, M. The effect of 12 weeks of different exercise training modalities or nutritional guidance on cardiometabolic risk factors, vascular parameters and physical fitness in overweight adults: cardiometabolic high-intensity interval training-resistance training randomized controlled study. J Strength Cond Res 34(8): 2178–2188, 2020—Evidence suggests that exercise training improves cardiometabolic r...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Physiological Demands of Professional Flat and Jump Horse Racing
This study aimed to quantify the respective demands of short and long flat and jump race distances. Twenty professional jockeys (10 flat and 10 jump) participated in the study. The subjects initially performed a graded incremental exercise test to volitional exhaustion on a treadmill to determine the peak heart rate (HR) and blood lactate concentrations. Two competitive races (short and long) were then monitored on 2 separate occasions for each jockey type to obtain hydration, HR, blood lactate concentration, and rating of perceived exertion data. Mean distances for the 4 races were: 1,247.2 ± 184.7 m (short flat ra...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

The Effect of Personal Protective Equipment on Firefighter Occupational Performance
Lesniak, AY, Bergstrom, HC, Clasey, JL, Stromberg, AJ, and Abel, MG. The effect of personal protective equipment on firefighter occupational performance. J Strength Cond Res 34(8): 2165–2172, 2020—The purpose of this study was to evaluate the effects of load carriage (LC) and LC plus respirator use (LC + self-contained breathing apparatus [SCBA]) on firefighters' work capacity to enhance our understanding of occupational demands. Twenty-one male structural firefighter recruits (age: 28.6 ± 4.3 years; height: 178.6 ± 7.2 cm; body mass: 94.1 ± 15.4 kg; body fat: 22.9 ± 6.1%) participat...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Energy Demands in Well-Trained Alpine Ski Racers During Different Duration of Slalom and Giant Slalom Runs
Bottollier, V, Coulmy, N, Le Quellec, L, and Prioux, J. Energy demands in well-trained alpine ski racers during different duration of slalom and giant slalom runs. J Strength Cond Res 34(8): 2156–2164, 2020—The purpose of this study was to investigate the energy demands of different duration slalom (SL) and giant slalom (GS) events in well-trained alpine ski racers. Eight well-trained alpine ski racers (age: 18.2 ± 0.8 years; stature: 1.72 ± 0.10 m; body mass: 65.8 ± 12.0 kg) performed an incremental laboratory test on cycle ergometer and 4 standardized alpine ski runs: short (ST) and long ...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Exercise on Body Posture, Functional Movement, and Physical Fitness in Children With Overweight/Obesity
This study aims to analyze whether a 13-week exercise program based on “movement quality” and “multi-games” can lead to simultaneous benefits to body posture, fundamental movements, and physical fitness of children with overweight/obesity. A total of 64 children (10.9 ± 1.3 years, 25.9 ± 3.8 kg·m−2, 38 girls and 26 boys) with overweight/obesity were assigned either to a 13-week exercise-based intervention group (IG) (n = 33) or to a control group (CG) (n = 31). Subjects underwent assessments of basic anthropometry (body mass and height), body posture (2-dimensional photogr...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

The Influence of Biological Maturity and Competitive Level on Isometric Force-Time Curve Variables and Vaulting Performance in Young Female Gymnasts
Moeskops, S, Oliver, JL, Read, PJ, Cronin, JB, Myer, GD, Haff, GG, and Lloyd, RS. The influence of biological maturity and competitive level on isometric force-time curve variables and vaulting performance in young female gymnasts. J Strength Cond Res 34(8): 2136–2145, 2020—This cross-sectional study investigated isometric force-time curve variables and vaulting performance in young female gymnasts of varying maturity and competitive levels. One hundred twenty gymnasts aged 5–14 years were subdivided into maturity groupings and also according to their competitive level. Subjects performed isometric midthi...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effectiveness of a Generic vs. Specific Program Training to Prevent the Short-Term Detraining on Repeated-Sprint Ability of Youth Soccer Players
Rodríguez-Fernández, A, Villa, JG, Sánchez-Sánchez, J, and Rodríguez-Marroyo, JA. Effectiveness of a generic vs. specific program training to prevent the short-term detraining on repeated-sprint ability of youth soccer players. J Strength Cond Res 34(8): 2128–2135, 2020—The aim of this study was to analyze the effects of 2 short-term training programs to prevent the negative effect of detraining on repeated-sprint ability (RSA) performance. The study was performed during a 2-week midseason break without official matches. Forty-five youth soccer players (17.7 ± 0.8 years...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Elevating the Noninvolved Limb Reduces Knee Extensor Asymmetry During Squat Exercise in Persons With Reconstructed Anterior Cruciate Ligament
The objective of this research was to examine if knee extensor NJM symmetry between the involved and noninvolved limbs could be attained with a modified squat. Six individuals with unilateral ACL reconstructed knees performed bilateral squats under normal conditions and with their noninvolved limb elevated on a 5-cm platform. Knee extensor NJM was determined using 3-dimensional motion analysis. Knee extensor NJM was lower in the involved compared with the noninvolved limb (95% confidence interval [CI], 0.08–0.28 N·m·kg−1; d = 1.66 SD) during normal squats. Knee extensor NJM was greater in the invo...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

The Effects of a Preconditioning Rolling Session on Subsequent Eccentric Exercise–Induced Muscle Damage
West, JT, Miller, WM, Jeon, S, and Ye, X. The effects of a preconditioning rolling session on subsequent eccentric exercise–induced muscle damage. J Strength Cond Res 34(8): 2112–2119, 2020—The aim of this study was to examine the effects of a preexercise unilateral quadriceps muscle rolling intervention on subsequent ipsilateral (IPSI) or contralateral (CTRA) knee extension eccentric exercise–induced muscle damage. Twenty-seven healthy volunteers (14 men) underwent an eccentric exercise protocol (6 sets of 10 repetitions with 75% of the maximal isometric strength) with a single-leg knee extension m...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

A Comparison of Bilateral vs. Unilateral-Biased Strength and Power Training Interventions on Measures of Physical Performance in Elite Youth Soccer Players
Stern, D, Gonzalo-Skok, O, Loturco, I, Turner, A, and Bishop, C. A comparison of bilateral vs. unilateral-biased strength and power training interventions on measures of physical performance in elite youth soccer players. J Strength Cond Res 34(8): 2105–2111, 2020—The aim of the present study was to compare the effects of bilateral and unilateral-biased strength and power training programs on measures of physical performance in male youth soccer players. Twenty-three elite youth players (age: 17.6 ± 1.2 years) were randomly assigned to either a unilateral (n = 11) or a bilateral (n = 12) group, who compl...
Source: Journal of Strength and Conditioning Research - July 30, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Manuscript Clarification
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Manuscript Clarification for Ischemic Preconditioning Improves Resistance Training Session Performance
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

What do Firefighting Ability Tests Tell Us About Firefighter Physical Fitness? A Systematic Review of the Current Evidence
Fyock-Martin, MB, Erickson, EK, Hautz, AH, Sell, KM, Turnbaugh, BL, Caswell, SV, and Martin, JR. What do firefighting ability tests tell us about firefighter physical fitness? A systematic review of the current evidence. J Strength Cond Res 34(7): 2093–2103, 2020—The firefighting profession is a physiologically demanding occupation. Currently, sudden cardiac deaths account for 40–50% of firefighter job-related deaths, for which, inadequate aerobic fitness (AF) and obesity are established as risk factors. Departments have instituted firefighting physical ability tests (FPATs) as a method of quantifying rea...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Tweeting for Nutrition: Feasibility and Efficacy Outcomes of a 6-Week Social Media-Based Nutrition Education Intervention for Student-Athletes
In conclusion, social media-based nutrition education may provide university-based strength and conditioning coaches and other sports practitioners with a tool for widespread and timely access to students to facilitate healthy dietary behaviors. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effect of Ibuprofen on Muscle, Hematological and Renal Function, Hydric Balance, Pain, and Performance During Intense Long-Distance Running
de Souza, RF, de Matos, DG, Ferreira, ARP, Chilibeck, P, Barros, NdA, de Oliveira, AS, Cercato, LM, da Silva, DS, and Aidar, FJ. Effect of ibuprofen on muscle, hematological and renal function, hydric balance, pain, and performance during intense long-distance running. J Strength Cond Res 34(7): 2076–2083, 2020—The aim of this study was to investigate the effect of prophylactic use of nonsteroidal anti-inflammatory drugs (i.e., ibuprofen) on physical performance, vertical jump, muscle biomarkers, liver, kidney, acute pain, and hydration status of participants in the 42-km Trail Running Challenge, a long-distanc...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Validity of Real-Time Ultra-wideband Global Navigation Satellite System Data Generated by a Wearable Microtechnology Unit
This study aimed to determine the validity of real-time ultra-wideband data generated by a wearable microtechnology unit during rugby league training sessions using a repeated-measures crossover study. Twenty-four semiprofessional rugby league players wore a commercially available microtechnology device (StatSports Apex, Newry, Northern Ireland) during 10 training sessions. Total distance; moderate-speed running (3.6–4.9 m·s−1); high-speed running (5.0–6.9 m·s−1); very high-speed running (≥7 m·s−1); maximum velocity (m·s−1); the number of high-intensity acc...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Physical Demands of Amateur Domestic and Representative Netball in One Season in New Zealand Assessed Using Heart Rate and Movement Analysis
King, DA, Cummins, C, Hume, PA, and Clark, TN. Physical demands of amateur domestic and representative netball in one season in New Zealand assessed using heart rate and movement analysis. J Strength Cond Res 34(7): 2062–2070, 2020—The purpose of this descriptive cohort study was to describe physical demands of netball for positions and between playing levels using microtechnology. Data were collected from 34 female netball players across 3 teams at different levels (over 19 years representative [O19], under 19 years representative [U19], and open-age amateur club domestic) for 20 games using heart rate and mic...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Influence of a Vented Mouthguard on Physiological Responses in Handball
Schulze, A, Laessing, J, Kwast, S, and Busse, M. Influence of a vented mouthguard on physiological responses in handball. J Strength Cond Res 34(7): 2055–2061, 2020—Mouthguards (MGs) improve sports safety. However, airway obstruction and a resulting decrease in performance are theoretical disadvantages regarding their use. The study aim was to assess possible limitations of a “vented” MG on aerobic performance in handball. The physiological effects were investigated in 14 male professional players in a newly developed handball-specific course. The measured values were oxygen uptake, ventilation, hea...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Differences in Physical Performance According to the Competitive Level in Amateur Handball Players
Estibaliz, R, Fabio, N, Rodrigo, RC, Daniel, C, Josune, RN, and Javier Y. Differences in physical performance according to the competitive level in amateur handball players. J Strength Cond Res 34(7): 2048–2054, 2020—The aim of this study was to compare physical performance in amateur handball players of 2 different competitive levels. Thirty-four senior handball players were divided into 2 groups according to their competitive level (regional category: REG or national category: NAC). Although no significant differences were found between groups in any of the horizontal jump (HJ) or vertical jump (VJ) variables...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Investigation in to the Positional Running Demands of Elite Gaelic Football Players: How Competition Data Can Inform Training Practice
This study investigated the positional running demands of elite Gaelic football players during match play and compared these demands with typical training activities used to prepare players for competition. Global positioning system (GPS) data were obtained from 30 elite Gaelic football players (26.9 ± 3.5 years, 182.8 ± 6.1 cm, 84.6 ± 8.1 kg) across a full season (13 competitive games and 78 training sessions). Only players who completed the full match and respective training sessions were included (n = 107 match files and n = 1,603 training files). Data were collected using 4-Hz GPS units (VX Sport, ...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Chronic Effects of Static and Dynamic Stretching on Hamstrings Eccentric Strength and Functional Performance: A Randomized Controlled Trial
Barbosa, GM, Trajano, GS, Dantas, GAF, Silva, BR, and Vieira, WHB. Chronic effects of static and dynamic stretching on hamstrings eccentric strength and functional performance: A randomized controlled trial. J Strength Cond Res 34(7): 2031–2039, 2020—The purpose of this study was to investigate the effect of static or dynamic stretching training program on hamstrings eccentric peak torque and functional performance. Forty-five active healthy men were randomly allocated into 3 groups (n = 15 per group): no stretching (control), static stretching (3 sets of 30 seconds), and dynamic stretching (3 sets of 30 repeti...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Exploring the Effects of Playing Formations on Tactical Behavior and External Workload During Football Small-Sided Games
This study aimed to identify the effects of playing formations on tactical behavior and external workload during football small-sided games. Twenty-three semiprofessional footballers integrated 3 different playing formations in a 7-a-side small-sided game, according to their specific player positions: team 4:3:0 (4 defenders and 3 midfielders); team 4:1:2 (4 defenders, 1 midfielder, and 2 forwards); and team 0:4:3 (4 midfielders and 3 forwards). Based on players' movement trajectories, the following individual and collective tactical variables were calculated: total distance covered and distance covered while walking, jogg...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Assessing Repeated-Sprint Ability in Division I Collegiate Women Soccer Players
Lockie, RG, Liu, TM, Stage, AA, Lazar, A, Giuliano, DV, Hurley, JM, Torne, IA, Beiley, MD, Birmingham-Babauta, SA, Stokes, JJ, Risso, FG, Davis, DL, Moreno, MR, and Orjalo, AJ. Assessing repeated-sprint ability in Division I collegiate women soccer players. J Strength Cond Res 34(7): 2015–2023, 2020—Repeated-sprint ability (RSA) is a key component of soccer, and is the capacity to repeatedly produce near-maximal to maximal sprints with short recovery periods. Repeated-sprint ability has received little analysis in collegiate women soccer players. The purpose of this study was to investigate relationships betwee...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Importance of Strength and Power on Key Performance Indicators in Elite Youth Soccer
Wing, CE, Turner, AN, and Bishop, CJ. Importance of strength and power on key performance indicators in elite youth soccer. J Strength Cond Res 34(7): 2006–2014, 2020—The purpose of this investigation was to examine the importance of strength and power in relation to key performance indicators (KPIs) within competitive soccer match play. This was achieved through using an experimental approach in which 15 subjects were recruited from a professional soccer club's scholarship squad during the 2013/14 season. Following anthropometric measures, power and strength were assessed across a range of tests which included...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Influence of Maximal Strength on In-Water and Dry-Land Performance in Young Water Polo Players
This study suggests that upper- and lower-body maximal strength parameters are important predictors of the performance capacity of water polo players. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research