Impact of Six Consecutive Days of Sprint Training in Hypoxia on Performance in Competitive Sprint Runners
Kasai, N, Mizuno, S, Ishimoto, S, Sakamoto, E, Maruta, M, Kurihara, T, Kurosawa, Y, and Goto, K. Impact of six consecutive days of sprint training in hypoxia on performance in competitive sprint runners. J Strength Cond Res 33(1): 36–43, 2019—The purpose of this study was to determine the effects of 6 successive days of repeated sprint (RS) training in moderate hypoxia on anaerobic capacity in 100–200-m sprint runners. Eighteen male sprint runners (age, 20.0 ± 0.3 years; height, 175.9 ± 1.1 cm; and body mass, 65.0 ± 1.2 kg) performed repeated cycling sprints for 6 consecutive days in ...
Source: Journal of Strength and Conditioning Research - December 19, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Biomechanical Comparison of Loaded Countermovement Jumps Performed on Land and in Water
Louder, T, Bressel, E, Nardoni, C, and Dolny, D. Biomechanical comparison of loaded countermovement jumps performed on land and in water. J Strength Cond Res 33(1): 25–35, 2019—Researchers have observed physical improvements after the completion of aquatic-based jump training. However, there is a lack of research on the biomechanical specificity of aquatic-based movement. Therefore, the purpose of this investigation was to evaluate the kinetics and kinematics of loaded countermovement jumps performed in water versus land. Twenty young men and 24 National Collegiate Athletic Association (NCAA) Division I female ...
Source: Journal of Strength and Conditioning Research - December 19, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Comparison of the Hang High Pull and Loaded Jump Squat for the Development of Vertical Jump and Isometric Force-Time Characteristics
Oranchuk, DJ, Robinson, TL, Switaj, ZJ, and Drinkwater, EJ. Comparison of the hang high pull and loaded jump squat for the development of vertical jump and isometric force-time characteristics. J Strength Cond Res 33(1): 17–24, 2019—Weightlifting movements have high skill demands and require expert coaching. Loaded jumps have a comparably lower skill demand but may be similarly effective for improving explosive performance. The purpose of this study was to compare vertical jump performance, isometric force, and rate of force development (RFD) after a 10-week intervention using the hang high pull (hang-pull) or ...
Source: Journal of Strength and Conditioning Research - December 19, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Perceptual, Mechanical, and Electromyographic Responses to Different Relative Loads in the Parallel Squat
Chapman, M, Larumbe-Zabala, E, Gosss-Sampson, M, Colpus, M, Triplett, NT, and Naclerio, F. Perceptual, mechanical, and electromyographic responses to different relative loads in the parallel squat. J Strength Cond Res 33(1): 8–16, 2019—The effectiveness of the OMNI-RES (0–10) Scale and the electromyographic signal for monitoring changes in the movement velocity were examined during a set to muscular failure using different percentages of 1 repetition maximum (1RM) in the parallel squat exercise (PSQ). Twelve men (26.3 ± 5.8 years) were evaluated on 8 separate days with 48 hours of rest between sess...
Source: Journal of Strength and Conditioning Research - December 19, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Effect of Strength on Velocity and Power During Back Squat Exercise in Resistance-Trained Men and Women
Askow, AT, Merrigan, JJ, Neddo, JM, Oliver, JM, Stone, JD, Jagim, AR, and Jones, MT. Effect of strength on velocity and power during back squat exercise in resistance-trained men and women. J Strength Cond Res 33(1): 1–7, 2019—The purpose was to examine load-velocity and load-power relationships of back squat in resistance-trained men (n = 20, 21.3 ± 1.4 years, 183.0 ± 8.0 cm, 82.6 ± 8.0 kg, 11.5 ± 5.0% total body fat) and women (n = 18; 20.0 ± 1.0 years; 166.5 ± 6.9 cm; 63.9 ± 7.9 kg, 20.3 ± 5.0% body fat). Body composition testing was performed followed ...
Source: Journal of Strength and Conditioning Research - December 19, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Authors' Response
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Methodological Flaws in Aubry, RL, Power, GA, and Burr, JF. An Assessment of Running Power as a Training Metric for Elite and Recreational Runners. J Strength Cond Res 32: 2258–2264, 2018
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Physical Fitness Performance of Young Professional Soccer Players Does not Change During Several Training Seasons in a Spanish Elite Reserve Team: Club Study, 1996–2013 Erratum
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Response to Effects of Reactiv “Maximum Beta-Hydroxy Beta-Methylbutyrate” on Body Mass and Performance in Elite Male Rugby Players
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

The Lack of Electromyography Normalization May Limit the Conclusions in: Traditional vs. Suspended Push-up Muscle Activation in Athletes and Sedentary Women
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Reliability and Sensitivity of Neuromuscular and Perceptual Fatigue Measures in Collegiate Men’s Basketball: Retraction
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Retraction Source Type: research

Athletic Profile of Alpine Ski Racers: A Systematic Review
Ferland, PM and Comtois, AS. Athletic profile of alpine ski racers: a systematic review. J Strength Cond Res 32(12): 3591–3600, 2018—The purpose of this study was to review all anthropometric and physical test results performed on alpine ski racers that were published in the scientific literature to build an athletic profile specific to the skier's sex and level. Four electronic databases were systematically searched using the following key words: alpine, skiing, and physiology. The manual search was performed through the reference list of all suitable publications, the author's personal collection, and the pro...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Brief Review Source Type: research

Concurrent Training Promoted Sustained Anti-atherogenic Benefits in the Fasting Plasma Triacylglycerolemia of Postmenopausal Women at 1-Year Follow-up
Rossi, FE, Diniz, TA, Fortaleza, ACS, Neves, LM, Picolo, MR, Monteiro, PA, Buonani, C, Lira, FS, and Freitas, IF Jr. Concurrent training promoted sustained anti-atherogenic benefits in the fasting plasma triacylglycerolemia of postmenopausal women at 1-year follow-up. J Strength Cond Res 32(12): 3573–3582, 2018—The aim of this study was to compare the effects of aerobic and concurrent training (aerobic plus strength training) on the lipid profiles of normotriacylglycerolemic and hypertriacylglycerolemic postmenopausal women and to verify whether the benefits of aerobic and concurrent training were sustained aft...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Self-Paced Team-Sport Match Simulation Results in Reductions in Voluntary Activation and Modifications to Biological, Perceptual, and Performance Measures at Halftime and for up to 96 Hours Postmatch
Tofari, PJ, Kemp, JG, and Cormack, SJ. Self-paced team-sport match-simulation results in reductions in voluntary activation and modifications to biological, perceptual, and performance measures at halftime and for up to 96 hours postmatch. J Strength Cond Res 32(12): 3561–3572, 2018—Assessing responses to soccer match play is limited by match variability or unrealistic simulations. To address this, the biological, perceptual, and performance responses were assessed using a self-paced, simulated soccer match protocol using a nonmotorized treadmill. Twelve male team-sport athletes performed the 90-minute simulati...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Comparison of Different Methods for the Swimming Aerobic Capacity Evaluation
This study compared velocity (v) and bioenergetical factors using different methods applied for the swimming aerobic capacity evaluation. Ten elite female swimmers (17.6 ± 1.9 years, 1.70 ± 0.05 m, and 61.3 ± 5.8 kg) performed an intermittent incremental velocity protocol until voluntary exhaustion to determine the v associated with the individual anaerobic threshold (IAnT), ventilatory threshold (VT), heart rate threshold (HRT), lactate threshold fixed in 3.5 mmol·L−1 (LT3.5), and maximal oxygen uptake (V[Combining Dot Above]O2max). Two-to-three 30-minute submaximal constant tests for the...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Hemodynamic and Cardiorespiratory Predictors of Sport Rock Climbing Performance
Fryer, SM, Giles, D, Garrido Palomino, I, de la O Puerta, A, and España-Romero, V. Hemodynamic and cardiorespiratory predictors of sport rock climbing performance. J Strength Cond Res 32(12): 3543–3550, 2018—Rock climbing performance has been suggested to involve a notable contribution from aerobic metabolism. Previously, it has been shown that forearm oxygenation kinetics can be used to distinguish ability groups and predict red-point sport climbing performance. Currently, it is not known if forearm oxygenation kinetics or a sport-specific assessment of cardiorespiratory fitness best predicts sport rock...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Basketball Players' Dynamic Performance Across Competition Levels
Bullock, GS, Arnold, TW, Plisky, PJ, and Butler, RJ. Basketball players' dynamic performance across competition levels. J Strength Cond Res 32(12): 3537–3542, 2018—Dynamic balance is an integral component in screening lower extremity injury risk. Previous research has identified the need to create sport- and competition level–specific dynamic balance injury cut points. The purpose of this study was to determine if dynamic balance differences exist, using the Lower Quarter Y Balance Test (YBT-LQ), across varying competition levels (middle school, high school, college, and professional), in basketball playe...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Benefits of Compression Garments Worn During Handball-Specific Circuit on Short-Term Fatigue in Professional Players
Ravier, G, Bouzigon, R, Beliard, S, Tordi, N, and Grappe, F. Benefits of compression garments worn during handball-specific circuit on short-term fatigue in professional players. J Strength Cond Res 32(12): 3528–3536, 2018—The purpose of this study was to investigate the benefits of full-leg length compression garments (CGs) worn during a handball-specific circuit exercises on athletic performance and acute fatigue-induced changes in strength and muscle soreness in professional handball players. Eighteen men (mean ± SD: age 23.22 ± 4.97 years; body mass: 82.06 ± 9.69 kg; height: 184.61 &plu...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Quantification of a Professional Football Team's External Load Using a Microcycle Structure
Martín-García, A, Gómez Díaz, A, Bradley, PS, Morera, F, and Casamichana, D. Quantification of a professional football team's external load using a microcycle structure. J Strength Cond Res 32(12): 3520–3527, 2018—The aims of this study were to (a) determine the external load of a football team across playing position and relative to competition for a structured microcycle and (b) examine the loading and variation the day after competition for players with or without game time. Training and match data were obtained from 24 professional football players who belonging to the reserve sq...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Individualizing Acceleration in English Premier League Academy Soccer Players
Abbott, W, Brickley, G, Smeeton, NJ, and Mills, S. Individualizing acceleration in English Premier League academy soccer players. J Strength Cond Res 32(12): 3512–3519, 2018—Global thresholds are typically used to band acceleration dependent on intensity. However, global thresholds do not account for variation in individual capacities, failing to quantify true intensity of acceleration. Previous research has investigated discrepancies in high-speed distance produced using global and individual speed thresholds, not yet investigated for acceleration. The current aim was to investigate discrepancies between globa...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Grip Strength in Youth Ice Hockey Players: Normative Values and Predictors of Performance
This study describes normative grip strength values in youth ice hockey players according to age, sex, body mass, and playing level. These athlete-specific norms may be used to help evaluate and monitor changes in grip strength over time in youth ice hockey players. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Importance, Reliability, and Usefulness of Acceleration Measures in Team Sports
This study assessed movement data from one professional rugby league team throughout 2 full seasons and 1 preseason period. Using both 5 and 10 Hz global positioning systems (GPS) units, a range of acceleration-based variables were evaluated for their interunit reliability, ability to discriminate between positions, and associations with perceived muscle soreness. The reliability of 5 Hz global positioning systems for measuring acceleration and deceleration ranged from good to poor (CV = 3.7–27.1%), with the exception of high-intensity deceleration efforts (CV = 11.1–11.8%), the 10 Hz units exhibited moderate-t...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Self-reported Measures of Strength and Sport-Specific Skills Distinguish Ranking in an International Online Fitness Competition
Serafini, PR, Feito, Y, and Mangine, GT. Self-reported measures of strength and sport-specific skills distinguish ranking in an international online fitness competition. J Strength Cond Res 32(12): 3483–3493, 2018—To determine if self-reported performance measures could distinguish ranking during the 2016 CrossFit Open, data from 3,000 male (n = 1,500; 27.2 ± 8.4 years; 85.2 ± 7.9 kg; 177.0 ± 6.5 cm) and women (n = 1500, 28.7 ± 4.9 years; 63.7 ± 5.8 kg; 163.7 ± 6.6 cm) competitors was used for this study. Competitors were split by gender and grouped into quintiles (Q1&n...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

The Seasonal Variations in Anthropometric and Performance Characteristics of Elite Intercounty Gaelic Football Players
Kelly, RA, and Collins, K. The seasonal variations in anthropometric and performance characteristics of elite inter county gaelic football players. J Strength Cond Res 32(12): 3475–3482, 2018—There is limited research assessing the anthropometric and performance variations in elite Gaelic football. The aim of this study was to assess the anthropometric and performance characteristics of an elite intercounty squad within a season. After ethical approval and informed consent, 26 participants were assessed at the start of preseason (November), after early in-season (January), and midseason (March). Measurements in...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Movement Patterns and Muscle Damage During Simulated Rugby Sevens Matches in National Team Players
Pereira, LA, Nakamura, FY, Moraes, JE, Kitamura, K, Ramos, SP, and Loturco, I. Movement patterns and muscle damage during simulated rugby sevens matches in national team players. J Strength Cond Res 32(12): 3465–3474, 2018—The aim of this study was to analyze the match performance (i.e., distance covered in different intensities), signs of muscle damage (assessed by means of creatine kinase [CK] activity and rate of force development [RFD]), and neuromuscular fatigue (using linear sprint and vertical jump performances) after 3 single-day simulated matches performed by rugby sevens players from the Brazilian Nat...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Energetic Demands of Interchange and Full-Match Rugby League Players
Cummins, CJ, Gray, AJ, Shorter, KA, Halaki, M, and Orr, R. Energetic demands of interchange and full-match rugby league players. J Strength Cond Res 32(12): 3456–3464, 2018—The purpose of this study was to describe and compare the metabolic demands of rugby league for interchange and full-match players in relation to positional groups. Eighteen elite rugby league players were recruited. A time-motion model was used to estimate the energy expenditure and metabolic demands of rugby league match-play using Global Positioning System (GPS) technology. This approach uses players' GPS velocity-time curves to examine r...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

The Activity Profile of Elite Male Amateur Boxing After the 2013 Rule Changes
Davis, P, Connorton, AJ, Driver, S, Anderson, S, and Waldock, R. The activity profile of elite male amateur boxing after the 2013 rule changes. J Strength Cond Res 32(12): 3450–3455, 2018—An activity profile of competitive elite amateur boxing after the rule changes in 2013 was created from video footage to allow identification of the technical and tactical demands as well as differences between winners and losers. The study analyzed 50 World Championship bouts involving 60 male boxers (mean ± SD) of age: 23.5 ± 2.8 years, height: 176.2 ± 12.2 cm, and body mass: 71.7 ± 16.2 kg. The r...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Response Time and Effectiveness in Elite Greco-Roman Wrestlers Under Simulated Fight Conditions
Gierczuk, D, Bujak, Z, Cieśliński, I, Lyakh, V, and Sadowski, J. Response time and effectiveness in elite Greco-Roman wrestlers under simulated fight conditions. J Strength Cond Res 32(12): 3442–3449, 2018—The purpose of the study was to determine changes in response time and its correlations with tactical and technical actions performed by Greco-Roman wrestlers in a fight. Twenty wrestlers aged 19–25 (21.4 JOURNAL/jscr/04.02/00124278-201812000-00017/math_17MM1/v/2018-11-25T214713Z/r/image-tiff 1.8) years were divided into 2 groups, i.e., finalists of Polish Senior Championships (winners of 1st and 2...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Relationships and Reliability Between a Drive Block Test and Traditional Football Performance Tests in High School Offensive Line Players
This study investigated the reliability of the average and peak velocity (avgV, peakV) and momentum (avgM, peakM) of a drive block test (DBT) in 15 high school OL and relationships to performance tests. A linear position transducer attached to the OL waist measured the DBT from a 3-point stance into a blocking pad. Linear speed was measured by a 36.58-m sprint. Change-of-direction (COD) ability was measured by the pro-agility shuttle (first COD, second COD, and total time) and COD deficit from the first (COD deficit 1) and second COD (COD deficit 2) of the pro-agility shuttle. Vertical jump, standing broad jump (SBJ), and ...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Changes in Vertical and Joint Stiffness in Runners With Advancing Age
Powell, DW and Williams, DSB. Changes in vertical and joint stiffness in runners with advancing age. J Strength Cond Res 32(12): 3425–3431, 2018—Age-related changes in the neuromuscular system underlie reduced performance and injury but may be mitigated through regular physical activity. It was hypothesized that older (OLD) compared with young (YOUNG) adults would exhibit greater vertical and joint stiffness when running at 3.35 m·s−1. Nine YOUNG and 10 OLD runners performed over ground running trials while three-dimensional biomechanics were recorded. Ankle and knee joint angles, moments and stiff...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Impact of Mild Hypohydration on Muscle Endurance, Power, and Strength in Healthy, Active Older Men
In this study, we examined this question, believing it may identify a factor exacerbating dynapenia. One-hour after having been passively exposed to heat where either a body mass loss of 1% was induced or euhydration maintained with fluid ingestion, 8 healthy, active older men (age: 68 ± 5 years) completed an exercise testing session where indices of muscle strength (30-second chair stand, grip strength, maximal isometric seated leg-press extension), endurance (seated leg-curl flexion + seated leg-press extension to exhaustion at 60% of 1 repetition maximum), and power (30-second Wingate test) were assessed. Gastroi...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Impact of Direction of Unloading Influence on Template Rate of Perceived Exertion
This study examined how altering workload intensity during a positive-pressure treadmill task may impact Rating of Perceived Exertion (RPE). In a counterbalanced design, 15 collegiate cross-country runners (7 men and 8 women) performed 2 25-minute runs at a constant velocity, while body mass (BM) was either increased from 60 to 100% (low-to-high progression trial [INC]) or decreased from 100 to 60% (high-to-low progression trial) in 5-minutes increments. Oxygen consumption (V[Combining Dot Above]O2), heart rate (HR), and respiratory exchange ratio (RER) were collected. RPE was recorded at the end of each stage, and energy ...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of High-Intensity Interval Training With Different Interval Durations on Physical Performance in Handball Players
Viaño-Santasmarinas, J, Rey, E, Carballeira, S, and Padrón-Cabo, A. Effects of high-intensity interval training with different interval durations on physical performance in handball players. J Strength Cond Res 32(12): 3398–3406, 2018—The purpose of this study was to compare the effects of 2 high-intensity interval training (HIIT) protocols with different interval durations (short [SI] vs. long [LI]) based on peak running velocity in 30–15 Intermittent Fitness Test (VIFT) in handball players. Eighteen highly-trained players (age: 22.7 ± 3.9 years; height: 181.5 ± 6.6 cm; body m...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Ammonia Inhalation Does Not Increase Deadlift 1-Repetition Maximum in College-Aged Male and Female Weight Lifters
Vigil, JN, Sabatini, PL, Hill, LC, Swain, DP, and Branch, JD. Ammonia inhalation does not increase deadlift 1-repetition maximum in college-aged male and female weight lifters. J Strength Cond Res 32(12): 3392–3397, 2018—Ammonia inhalant use by powerlifters and weight lifters is a prevalent practice with little research support for improved performance. The purpose of this study was to investigate the effects of ammonia as a stimulant on athletic performance during a deadlift 1-repetition maximum (1RM) absolute strength test. Subjects (men: n = 10, mean ± SD age = 21 ± 1 year, mass = 72.5 ±...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

A Low-Carbohydrate Ketogenic Diet Reduces Body Mass Without Compromising Performance in Powerlifting and Olympic Weightlifting Athletes
Greene, DA, Varley, BJ, Hartwig, TB, Chapman, P, and Rigney, M. A low-carbohydrate ketogenic diet reduces body mass without compromising performance in powerlifting and Olympic weightlifting athletes. J Strength Cond Res 32(12): 3382–3391, 2018—Weight class athletes use weight-making strategies to compete in specific weight categories with an optimum power-to-weight ratio. There is evidence that low carbohydrate diets might offer specific advantages for weight reduction without the negative impact on strength and power previously hypothesized to accompany carbohydrate restriction. Therefore, the purpose of this...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Between-Session Reliability of Isometric Midthigh Pull Kinetics and Maximal Power Clean Performance in Male Youth Soccer Players
Dos'Santos, T, Thomas, C, Comfort, P, McMahon, JJ, Jones, PA, Oakley, NP, and Young, AL. Between-session reliability of isometric midthigh pull kinetics and maximal power clean performance in male youth soccer players. J Strength Cond Res 32(12): 3373–3381, 2018—The aim of the study was to determine the between-session reliability of isometric midthigh pull (IMTP) kinetics and maximal weight lifted during the power clean (PC) in male youth soccer players, and to identify the smallest detectable differences between sessions. Thirteen male youth soccer players (age: 16.7 ± 0.5 years, height: 1.80 ± ...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Differences in the Electromyographic Activity of the Hamstring, Gluteus Maximus, and Erector Spinae Muscles in a Variety of Kinetic Changes
This study aimed to clarify the differences in the electromyographic (EMG) activity of the semitendinosus (ST), semimembranosus (SM), biceps femoris long head (BFl), gluteus maximus (GM), and erector spinae (ES) muscles during leg curl and bridge exercises across different knee angles and isometric contraction outputs. Sixteen male volunteers participated in this study. The EMG of all targeted muscles was measured at 20 and 40% of the maximal voluntary isometric contraction (MVIC) in the leg curl and during bilateral and unilateral bridge exercises. The knee flexion angle was randomly set at 30, 60, 90, and 120° during...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

The Effects of 10-week Integrated Neuromuscular Training on Fundamental Movement Skills and Physical Self-efficacy in 6–7-Year-Old Children
This study examined the effect of INT on process and product fundamental movement skill measures and physical self-efficacy in 6–7-year-old children. Ninety-four children from 2 primary schools were randomized into either a 10-week INT program or a control group (CON) (n = 41). Results indicated significantly greater increases in process fundamental movement skill (FMS) scores in INT vs. CON (p = 0.001). For product measures of FMS, 10-m sprint time, counter movement jump, seated medicine ball throw and standing long jump (all p = 0.001), all significantly increased to a greater extent in the INT group vs. CON. A sig...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Repetition Performance and Blood Lactate Responses Adopting Different Recovery Periods Between Training Sessions in Trained Men
Miranda, H, Maia, MF, Paz, GA, de Souza, JAAA, Simão, R, Farias, DA, and Willardson, JM. Repetition performance and blood lactate responses adopting different recovery periods between training sessions in trained men. J Strength Cond Res 32(12): 3340–3347, 2018—The purpose of this study was to examine the effect of different recovery periods (24, 48, and 72 hours) between repeated resistance training (RT) sessions for the upper-body muscles on repetition performance and blood lactate responses in trained men. Sixteen recreationally trained men (age: 26.1 ± 3.1 years; height: 179 ± 4.5 cm; b...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

The Effects of Ballistic and Nonballistic Bench Press on Mechanical Variables
Moir, GL, Munford, SN, Moroski, LL, Davis, SE. The effects of ballistic and nonballistic bench press on mechanical variables. J Strength Cond Res 32(12): 3333–3339, 2018—The purpose of this study was to investigate the effects of ballistic and nonballistic bench press performed with loads equivalent to 30 and 90% 1 repetition maximum (1RM) on mechanical variables. Eleven resistance-trained men (age: 23.0 ± 1.4 years; mass: 98.4 ± 14.4 kg) attended 4 testing sessions where they performed one of the following sessions: (a) 3 sets of 5 nonballistic repetitions performed with a load equivalent to 30% ...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Maximal Strength Training Improves Strength Performance in Grapplers
Øvretveit, K and Tøien, T. Maximal strength training improves strength performance in grapplers. J Strength Cond Res 32(12): 3326–3332, 2018—The aim of this study was to assess the short-term effects of maximal strength training (MST) as an accessory to grappling training on strength performance in competitive Brazilian Jiu-Jitsu (BJJ) athletes. Fourteen male BJJ athletes underwent measurements of 1 repetition maximum (1RM) in the squat and bench press, rate of force development (RFD) and peak force (PF) in the squat jump, countermovement jump (CMJ) height, and muscular endurance in pull-ups, sit-...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Metabolic Responses to a Battling Rope Protocol Performed in the Seated or Stance Positions
Brewer, W, Kovacs, R, Hogan, K, Felder, D, and Mitchell, H. Metabolic responses to a battling rope protocol performed in the seated or stance positions. J Strength Cond Res 32(12): 3319–3325, 2018—The purpose of this study is to compare the levels of oxygen consumption and heart rate responses elicited by a treadmill or cycle V[Combining Dot Above]O2max test with a standing or sitting battling rope protocol (BRP) (treadmill vs. standing BRP) (cycle vs. seated BRP). Forty healthy subjects performed either a ramped V[Combining Dot Above]O2max treadmill or cycle test. At least 3 days later, the subjects who perfor...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Acute Physiological Responses to an Intensity-And Time-Under-Tension-Equated Single- vs. Multiple-Set Resistance Training Bout in Trained Men
Cintineo, HP, Freidenreich, DJ, Blaine, CM, Cardaci, TD, Pellegrino, JK, and Arent, SM. Acute physiological responses to an intensity-and time under-under-tension-equated single- vs. multiple-set resistance training bout in trained men. J Strength Cond Res 32(12): 3310–3318, 2018—Regardless of the setting, proper manipulation of resistance training program design variables is pivotal in eliciting the desired physiological adaptations. Furthermore, how these variables, especially volume and intensity, work together to affect training outcomes is a major topic of investigation. The purpose of this study was to co...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Kinetic Analysis of Isometric Back Squats and Isometric Belt Squats
This study compared lower extremity and low-back kinetics during isometric back squats and isometric belt squats. Sixteen men (age: 22.6 ± 3.4 years; height: 1.74 ± 0.11 m; mass: 82.0 ± 5.6 kg) and 10 women (age: 21.5 ± 2.5 years; height: 1.64 ± 0.10 m; mass: 68.9 ± 7.1 kg) performed isometric back squats and belt squats at 4 squat depths. Joint resultant moments were calculated from kinematic and ground reaction force data. Linear interpolation was used to estimate peak vertical forces and joint moments at a 45° thigh segment angle. Subjects increased peak forces, ankle moment...
Source: Journal of Strength and Conditioning Research - November 27, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Variable Resistance Training on Maximal Strength: A Meta-Analysis Retraction
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Retraction Source Type: research

Effects of Variable Resistance Training on Maximal Strength: A Meta-analysis
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Sex-Related Differences in the Accuracy of Estimating Target Force Using Percentages of Maximal Voluntary Isometric Contractions vs. Ratings of Perceived Exertion During Isometric Muscle Actions
Keller, JL, Housh, TJ, Smith, CM, Hill, EC, Schmidt, RJ, and Johnson, GO. Sex-related differences in the accuracy of estimating target force using percentages of maximal voluntary isometric contractions vs. ratings of perceived exertion during isometric muscle actions. J Strength Cond Res 32(11): 3294–3300, 2018—The purpose of this study was to examine sex-related differences in the accuracy of estimating actual target force and to compare the accuracy of estimating actual target force using percentages of maximal voluntary isometric contraction (MVIC) or ratings of perceived exertion (RPE) values during isomet...
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Time Response of Photobiomodulation Therapy on Muscular Fatigue in Humans
Rossato, M, Dellagrana, RA, Sakugawa, RL, Lazzari, CD, Baroni, BM, and Diefenthaeler, F. Time response of photobiomodulation therapy on muscular fatigue in humans. J Strength Cond Res 32(11): 3285–3293, 2018—The aim of this study was to identify the effects of 2 different time responses on fatigue of knee extensor. Sixteen male volunteers (26 ± 6.0 years, 81 ± 12 kg, and 181 ± 7.4 cm) participated in the study. Participants performed the same protocol in 5 sessions {control, placebo (placebo applied both 6 hours before and immediately before the test), 6 hours before + immediately before (p...
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Differential Effects of Different Warm-up Protocols on Repeated Sprints-Induced Muscle Damage
Chen, CH, Ye, X, Wang, YT, Chen, YS, and Tseng, WC. Differential effects of different warm-up protocols on repeated sprints-induced muscle damage. J Strength Cond Res 32(11): 3276–3284, 2018—The purpose of this investigation was to examine whether adding a set of hamstring resistance exercise or dynamic stretching to a regular running-based warm-up before a bout of repeated sprints provides protective effects against the sprinting-induced muscle damage. Twelve elite tennis players participated in this study. After the familiarization, subjects completed 3 separate randomly sequenced experimental visits, during ...
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Original Research Source Type: research

Self-Preferred Initial Position Could Be a Viable Alternative to the Standard Squat Jump Testing Procedure
Petronijevic, MS, Garcia Ramos, A, Mirkov, DM, Jaric, S, Valdevit, Z, and Knezevic, OM. Self-preferred initial position could be a viable alternative to the standard squat jump testing procedure. J Strength Cond Res 32(11): 3267–3275, 2018—The purpose of this study was to compare both the magnitude and reliability of different variables (knee angle, squat depth, jump height [Hmax], maximum force [Fmax], and maximum power [Pmax]) between the standardized squat jump (SJ) and the SJ performed from the self-preferred position. Eleven team handball players (age: 19.5 ± 1.1 years; height: 1.88 ± 0.06 m;...
Source: Journal of Strength and Conditioning Research - November 1, 2018 Category: Sports Medicine Tags: Original Research Source Type: research