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

Lower Extremity Strength and Recovery Time in Youth Baseball Pitchers: A Pilot Study
Livingston, JL and Tavoukjian, NM. Lower extremity strength and recovery time in youth baseball pitchers: a pilot study. J Strength Cond Res 34(7): 1990–1998, 2020—The purpose of this study was to investigate the Little League pitching regulations by measuring the change in lower extremity force production after a pitching performance and the subsequent days of rest required for youth baseball pitchers to recover. Bilateral manual muscle testing of the gluteus maximus, hamstrings, gluteus medius, triceps surae, and quadriceps was conducted using a handheld dynamometer. Fifteen healthy, youth baseball pitchers (...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Match-Play Demands of Elite U17 Hurlers During Competitive Matches
Young, D, Mourot, L, Beato, M, and Coratella, G. Match-play demands of elite U17 hurlers during competitive matches. J Strength Cond Res 34(7): 1982–1989, 2020—The current study aimed to quantify the match-play workload in elite male under 17 hurlers, measuring the differences between the first and second halves and between positions. Global positioning system (10-Hz) and heart rate monitors were used to collect data from 76 players during 18 matches. Players' total distance (TD), relative distance (RD), high-speed running (HSR), the number and length of sprints, and the total sprint distance (TSD) was 6,483 &p...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Maximum Movement Workloads and High-Intensity Workload Demands by Position in NCAA Division I Collegiate Football
Sanders, GJ, Roll, B, Peacock, CA, and Kollock, RO. Maximum movement workloads and high-intensity workload demands by position in NCAA Division I collegiate football. J Strength Cond Res 34(7): 1974–1981, 2020—The purpose of the study was to quantify the average and maximum (i.e., peak) movement workloads, and the percent of those workloads performed at high intensity by NCAA Division I football athletes during competitive games. Using global positioning system devices (Catapult Sports), low, moderate, and high and total multidirectional movement workloads were quantified by each position. Strategically achievi...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Combined Balance and Plyometric Training on Athletic Performance in Female Basketball Players
Bouteraa, I, Negra, Y, Shephard, RJ, and Chelly, MS. Effects of combined balance and plyometric training on athletic performance in female basketball players. J Strength Cond Res 34(7): 1967–1973, 2020—The purpose of this study was to examine the effect of 8 weeks combined balance and plyometric training on the physical fitness of female adolescent basketball players. Twenty-six healthy regional-level players were randomly assigned to either an experimental group (E; n = 16, age = 16.4 ± 0.5) or a control group (C; n = 10, age = 16.5 ± 0.5). C maintained their normal basketball training schedule, ...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Sequencing Effects of Plyometric Training Applied Before or After Regular Soccer Training on Measures of Physical Fitness in Young Players
Ramirez-Campillo, R, Alvarez, C, Gentil, P, Loturco, I, Sanchez-Sanchez, J, Izquierdo, M, Moran, J, Nakamura, FY, Chaabene, H, and Granacher, U. Sequencing effects of plyometric training applied before or after regular soccer training on measures of physical fitness in young players. J Strength Cond Res 34(7): 1959–1966, 2020—To compare the effects of short-term (i.e., 7 weeks) plyometric jump training applied before (PJT-B) or after (PJT-A) soccer practice on components of physical fitness in young soccer players, a single-blind randomized controlled trial was conducted. Postpubertal boys aged 17.0 ± 0....
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Hamstring Myoelectrical Activity During Three Different Kettlebell Swing Exercises
Del Monte, MJ, Opar, DA, Timmins, RG, Ross, JA, Keogh, JWL, and Lorenzen, C. Hamstring myoelectrical activity during three different kettlebell swing exercises. J Strength Cond Res 34(7): 1953–1958, 2020—Kettlebell exercises have become an increasingly popular form of resistance training and component of lower-body rehabilitative training programs, despite a lack of scientific literature illustrating internal mechanisms and effectiveness of these approaches. Participants (n = 14) performed 3 different styles of kettlebell swings (hip hinge, squat, and double knee extension) and were assessed for medial hamstrin...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Knee Kinetics During Squats of Varying Loads and Depths in Recreationally Trained Women
Flores, V, Becker, J, Burkhardt, E, and Cotter, J. Knee kinetics during squats of varying loads and depths in recreationally trained women. J Strength Cond Res 34(7): 1945–1952, 2020—The back squat exercise is typically practiced with varying squat depths and barbell loads. However, depth has been inconsistently defined, resulting in unclear safety precautions when squatting with loads. In addition, women exhibit anatomical and kinematic differences to men, which may predispose them to knee joint injuries. The purpose of this study was to characterize peak knee extensor moments (pKEMs) at 3 commonly practiced s...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Alcohol After Resistance Exercise Does Not Affect Muscle Power Recovery
Levitt, DE, Idemudia, NO, Cregar, CM, Duplanty, AA, Hill, DW, and Vingren, JL. Alcohol after resistance exercise does not affect muscle power recovery. J Strength Cond Res 34(7): 1938–1944, 2020—The purpose of this study was to investigate the effect of alcohol consumed after heavy eccentric resistance exercise on measures of muscle power. After familiarization and an initial eccentric exercise bout to control for the “repeated-bout effect,” 10 recreationally resistance-trained men completed 2 identical heavy eccentric squat bouts (4 sets of 10 repetitions at 110% of concentric 1-repetition maximum)...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Neuromuscular Fatigue in Pitchers Across a Collegiate Baseball Season
Stone, BL and Schilling, BK. Neuromuscular fatigue in pitchers across a collegiate baseball season. J Strength Cond Res 34(7): 1933–1937, 2020—Neuromuscular fatigue in baseball pitchers has become an important aspect of injury risk. It is imperative to understand how fatigue is manifested to enhance resiliency and mitigate injury risk. Secondarily, collecting data on neuromuscular characteristics of baseball pitchers provides a framework to address these concerns. Using the countermovement jump, this study observed neuromuscular performance during the preseason, midseason, and postseason of a collegiate basebal...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Range of Motion and Injury Occurrence in Elite Spanish Soccer Academies. Not Only a Hamstring Shortening—Related Problem
Sanz, A, Pablos, C, Ballester, R, Sanchez-Alarcos, JV, and Huertas, F. Range of motion and injury occurrence in elite Spanish soccer academies. Not only a hamstring shortening—related problem. J Strength Cond Res 34(7): 1924–1932, 2020—Age-related development of range of motion (ROM) during an active hip flexion (active straight leg raise) and its relationship with hamstring injury occurrence were examined in 1657 young male soccer players (9–18 years of age). Age-related differences in ROM showed a significant decrease from U9 to U11 (p = 0.001), from U11 to U13 (p (Source: Journal of Strength and ...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Anthropometric and Body Composition Profile of Young Professional Soccer Players
Bernal-Orozco, MF, Posada-Falomir, M, Quiñónez-Gastélum, CM, Plascencia-Aguilera, LP, Arana-Nuño, JR, Badillo-Camacho, N, Márquez-Sandoval, F, Holway, FE, and Vizmanos-Lamotte, B. Anthropometric and body composition profile of young professional soccer players. J Strength Cond Res 34(7): 1911–1923, 2020—The purpose was to describe the anthropometric and body composition profile of young professional soccer players and to compare the players profiles between different competitive divisions and playing positions. A retrospective cross-sectional study was carried out with anthrop...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Pacing During 200-m Competitive Masters Swimming
This study aimed to examine masters athletes pacing strategies categorized by stroke, gender, age, and performance level. Data were retrieved from World and European masters swimming championships and contained data for 4,272 performances. Performances were coded for stroke, gender, age, and performance classification (PC). Performance classification was based on comparison to the appropriate masters world record. Performances were then normalized, with split times being expressed as a percentage faster or slower than average 50-m split time to determine relative pace. Coefficient of variation (CV) of 50-m time was examine...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Strength and Conditioning Practices of Head Coaches of Male and Female Interscholastic Sport Teams
Shurley, JP, Ednie, AJ, and Rudebeck, TJ. Strength and conditioning practices of head coaches of male and female interscholastic sport teams. J Strength Cond Res 34(7): 1894–1902, 2020—In a 1989 position paper, the National Strength and Conditioning Association (NSCA) recommended that male and female athletes be trained in a similar manner with regard to modalities and program design. To determine whether that recommendation is being followed, this study examined training practices of coaches of male and female athletes at the interscholastic level. Electronic surveys regarding strength training practices were ...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of a Multi-ingredient Beverage on Recovery of Contractile Properties, Performance, and Muscle Soreness After Hard Resistance Training Sessions
This study compared the effects of postworkout supplementation ingesting a multi-ingredient (MTN) vs. carbohydrate alone (CHO) on the recovery of muscle function and perceived of delayed onset of muscle soreness (DOMS) after hard resistance workouts. In a double-blinded, crossover design, 10 resistance trained men (26.9 ± 7.4 years) performed 2 identical 5-day intervention periods while ingesting either MTN or CHO. The subjects performed one workout per day during the first 3 days. Thereafter, they were assessed 1, 24, and 48 hours after the completion of the third workout session. Primary outcome was tensiomyograph...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Maximal vs. Submaximal Isometric Fatiguing Exercise on Subsequent Submaximal Exercise Performance
Miller, WM, Ye, X, and Jeon, S. Effects of maximal vs. submaximal isometric fatiguing exercise on subsequent submaximal exercise performance. J Strength Cond Res 34(7): 1875–1883, 2020—Exercise-induced muscle fatigue directly influences subsequent exercise performance. Thus, we examined task failure times for submaximal intermittent fatiguing isometric contractions performed after a bout of sustained maximal vs. submaximal isometric fatiguing contractions with the dominant elbow flexors. Twenty physically active individuals 8 men (mean ± SD = 21.4 ± 1.8 years; 80.9 ± 12.5 kg; 180 ± 6...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Rest Redistribution Does Not Alter Hormone Responses in Resistance-Trained Women
Merrigan, JJ, Tufano, JJ, Fields, JB, Oliver, JM, and Jones, MT. Rest redistribution does not alter hormone responses in resistance-trained women. J Strength Cond Res 34(7): 1867–1874, 2020—The purpose was to examine acute effects of rest redistribution (RR) on perceptual, metabolic, and hormonal responses during back squats. Twelve resistance-trained women (training age 5 ± 2 years; one repetition maximum [1-RM] per body mass, 1.6 ± 0.2) performed traditional (TS, 4 sets of 10 repetitions with 120 seconds interset rest) and RR sets (4 sets of two 5 repetition clusters with 30-second intraset rest...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Attentional Focus and the Effect on Change-of-Direction and Acceleration Performance
McNicholas, K and Comyns, TM. Attentional focus and the effect on change-of-direction and acceleration performance. J Strength Cond Res 34(7): 1860–1866, 2020—The purpose of this study was to investigate whether changing the focus of attention of field sport athletes would affect their performance for a change-of-direction (COD) and acceleration task incorporating diagonal cutting movements of less than or equal to 90°, specific to the demands of field-based sports. Seventeen male college students were recruited to perform 9 trials each of a change-of-direction and acceleration test using verbal instruction...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Training With Free Weights Versus Machines on Muscle Mass, Strength, Free Testosterone, and Free Cortisol Levels
Schwanbeck, SR, Cornish, SM, Barss, T, and Chilibeck, PD. Effects of training with free weights versus machines on muscle mass, strength, free testosterone, and free cortisol levels. J Strength Cond Res 34(7): 1851–1859, 2020—Free weights offer a more unstable training environment, which enhances muscle recruitment, whereas some machines have the advantage of using a “cam” pulley system that better matches strength curves. We compared the effect of training with free weights vs. machines on muscle mass, strength, free testosterone, and free cortisol concentrations. Forty-six subjects (26 women; 22 &...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Preparing for a National Weightlifting Championship: A Case Series
This study aimed to characterize psychological, physiological, and performance changes of a high-level female (24.5 years; 53.8 ± 0.3 kg; 155.4 cm) and male (25.8 years; 92.7 ± 1.2 kg; 189 cm) weightlifter over 28 weeks while preparing for a national championship. Body mass, hydration, psychological inventories, serum biomarkers, vastus lateralis muscle cross-sectional area (CSA), and squat jump (SJ) performance were assessed weekly beginning 11 weeks from the competition date. Weightlifting performance goals were met for the female athlete (actual total = 159 kg) but not for the male athlete (actual total = ...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

A Comparison of Kinetic and Kinematic Variables During the Midthigh Pull and Countermovement Shrug, Across Loads
This study compared kinetic and kinematic variables during the midthigh pull (MTP) and countermovement shrug (CMS). Eighteen men (age: 29.43 ± 3.95 years, height: 1.77 ± 0.08 m, body mass: 84.65 ± 18.79 kg, and 1 repetition maximum [1RM] power clean: 1.02 ± 0.18 kg·kg−1) performed the MTP and CMS at intensities of 40, 60, 80, 100, 120, and 140% 1RM, in a progressive manner. Peak force (PF), mean force (MF), peak velocity, peak barbell velocity (BV), peak power, (PP), mean power (MP), and net impulse were calculated from force-time data during the propulsion phase. During the CMS, PF...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

A Comparison of Kinetic and Kinematic Variables During the Pull From the Knee and Hang Pull, Across Loads
Meechan, D, McMahon, JJ, Suchomel, TJ, and Comfort, P. A comparison of kinetic and kinematic variables during the pull from the knee and hang pull, across loads. J Strength Cond Res 34(7): 1819–1829, 2020—Kinetic and kinematic variables during the pull from the knee (PFK) and hang pull (HP) were compared in this study. Eighteen men (age = 29.43 ± 3.95 years; height 1.77 ± 0.08 m; body mass 84.65 ± 18.79 kg) performed the PFK and HP with 40, 60, 80, 100, 120, and 140% of 1-repetition maximum (1RM) power clean, in a progressive manner. Peak force (PF), mean force (MF), peak system velocity (P...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Training With Weightlifting Derivatives: The Effects of Force and Velocity Overload Stimuli
Suchomel, TJ, McKeever, SM, and Comfort, P. Training with weightlifting derivatives: The effects of force and velocity overload stimuli. J Strength Cond Res 34(7): 1808–1818, 2020—The purposes of this study were to compare the training effects of weightlifting movements performed with (CATCH) or without (PULL) the catch phase of clean derivatives performed at the same relative loads or training without the catch phase using a force- and velocity-specific overload stimulus (OL) on isometric and dynamic performance tasks. Twenty-seven resistance-trained men completed 10 weeks of training as part of the CATCH, PUL...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Intervention for Reducing Sleep Disturbances After a 12-Time Zone Transition
Hoshikawa, M, Uchida, S, and Dohi, M. Intervention for reducing sleep disturbances after a 12-time zone transition. J Strength Cond Res 34(7): 1803–1807, 2020—The purpose of this study was to examine the effect of an intervention consisting of bright light exposure, sleep schedule shifts, and ramelteon on sleep disturbances after a transition of 12 time zones. Two groups, which flew from Tokyo to Rio, participated in this study. The experimental group received the treatment, whereas the control group did not receive any treatment. The experimental group members were exposed to bright light at night and their sl...
Source: Journal of Strength and Conditioning Research - June 25, 2020 Category: Sports Medicine Tags: Research Note Source Type: research

Anthropometric and Physiological Characteristics of Elite Male Rugby Athletes
Brazier, J, Antrobus, M, Stebbings, GK, Day, SH, Callus, P, Erskine, RM, Bennett, MA, Kilduff, LP, and Williams, AG. Anthropometric and physiological characteristics of elite male rugby athletes. J Strength Cond Res 34(6): 1790–1801, 2020—This is the first article to review the anthropometric and physiological characteristics required for elite rugby performance within both rugby union (RU) and rugby league (RL). Anthropometric characteristics such as height and body mass, and physiological characteristics such as speed and muscular strength, have previously been advocated as key discriminators of playing level...
Source: Journal of Strength and Conditioning Research - May 27, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Strength Training to Improve Performance in Athletes With Cerebral Palsy: A Systematic Review of Current Evidence
Fleeton, JRM, Sanders, RH, and Fornusek, C. Strength training to improve performance in athletes with cerebral palsy: A systematic review of current evidence. J Strength Cond Res 34(6): 1774–1789, 2020—Persons with cerebral palsy (CP) can partake in many different forms of organized sport including elite competition at state and international levels. There is limited evidence on how CP athletes should train to enhance performance. The purposes of this article were to conduct a systematic review of the current evidence on ambulatory individuals with CP for (a) strength and functional improvement through strength...
Source: Journal of Strength and Conditioning Research - May 27, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research