Journal of Strength and Conditioning Research 
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This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.Countermovement Jump and Squat Jump Force-Time Curve Analysis in Control and Fatigue Conditions
This study aimed to reanalyze previously published discrete force data from countermovement jumps (CMJs) and squat jumps (SJs) using statistical parametric mapping (SPM), a statistical method that enables analysis of data in its native, complete state. Statistical parametric mapping analysis of 1-dimensional (1D) force-time curves was compared with previous zero-dimensional (0D) analysis of peak force to assess sensitivity of 1D analysis. Thirty-two subjects completed CMJs and SJs at baseline, 15 minutes, 1, 24, and 48 hours following fatigue and control conditions in a pseudo random cross-over design. Absolute (CMJABS/SJA...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Muscle Architecture and Maturation Influence Sprint and Jump Ability in Young Boys: A Multistudy Approach
Radnor, JM, Oliver, JL, Waugh, CM, Myer, GD, and Lloyd, RS. Muscle Architecture and Maturation Influence Sprint and Jump Ability in Young Boys: A Multistudy Approach. J Strength Cond Res 36(10): 2741–2751, 2022—This series of experiments examined the influence of medial gastrocnemius (GM) and vastus lateralis (VL) muscle architecture (muscle thickness, pennation angle, and fascicle length) on sprint and jump performance in pre–, circa–, and post–peak height velocity (PHV) boys. In experiment 1, 1-way analysis of variance and Cohen's d effect sizes demonstrated that most muscle architecture measures were significa...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Physiological and Perceptual Responses to a Single Session of Resisted Sled Sprint Training at Light or Heavy Sled Loads
Monahan, M, Petrakos, G, and Egan, B. Physiological and perceptual responses to a single session of resisted sled sprint training at light or heavy sled loads. J Strength Cond Res 36(10): 2733–2740, 2022—The acute physiological and perceptual responses to a single session of resisted sled sprint (RSS) training are largely unexplored, nor have differences, if any, between male and female athletes been compared. Team field sport athletes (n = 27; male/female, 15/12; 21.1 ± 2.7 years) were assessed for Maximal Resisted Sled Load (MRSL) from which light (L-RSS, 30%MRSL) and heavy (H-RSS, 80%MRSL) sled loads were prescribe...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Effects of Different Loading Conditions During Resisted Sprint Training on Sprint Performance
Rodríguez-Rosell, D, Sáez de Villarreal, E, Mora-Custodio, R, Asián-Clemente, JA, Bachero-Mena, B, Loturco, I, and Pareja-Blanco, F. Effects of different loading conditions during resisted sprint training on sprint performance. J Strength Cond Res 36(10): 2725–2732, 2022—The aim of this study was to compare the effects of 5 loading conditions (0, 20, 40, 60, and 80% of body mass [BM]) during weighted sled sprint training on unresisted and resisted sprint performance and jump ability. Sixty physically active men were randomly assigned into 5 groups according to the overload used during sled sprint training: 0% (G0%, ...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Acute Effects of Warming Up on Achilles Tendon Blood Flow and Stiffness
Pieters, D, Wezenbeek, E, De Ridder, R, Witvrouw, E, and Willems, T. Acute effects of warming up on Achilles tendon blood flow and stiffness. J Strength Cond Res 36(10): 2717–2724, 2022—The aim of this study was to investigate the acute effect of frequently used warm-up exercises on the Achilles tendon blood flow and stiffness. In doing so, we want to explore which exercises are suitable to properly prepare the athlete's Achilles tendon in withstanding high amounts of loading during sport activities. This knowledge could help sport physicians and physiotherapists when recommending warm-up exercises that are able to imp...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Metabolic Profile of Reciprocal Supersets in Young, Recreationally Active Women and Men
This study suggests that a RSS is a metabolically demanding RE session that may elicit increases in musculoskeletal, cardiorespiratory, and physiological adaptations while decreasing the duration of exercise. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Influence of Movement Velocity on Accuracy of Estimated Repetitions to Failure in Resistance-Trained Men
This study explored the accuracy in estimated repetitions to failure (ERF) and changes in mean concentric velocity (MCV) during resistance exercise. Twenty male resistance trainers (age, 26.3 ± 6.9 years; body mass, 82.0 ± 6.0 kg; stature, 178.0 ± 5.5 cm) completed 5 sets of 10 repetitions for the bench press and squat at 70% one-repetition maximum. Subjects' reported their rating of perceived exertion (RPE) and ERF after the 10th repetition of each set and then continued repetitions to momentary muscle failure (5-minute recovery between sets). Barbell velocity was assessed using a linear position transducer. For the be...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Repetitions in Reserve Is a Reliable Tool for Prescribing Resistance Training Load
This study investigated the reliability of repetitions in reserve (RIR) as a method for prescribing resistance training load for the deadlift and bench press exercises. Fifteen novice trained men (age: 17.3 ± 0.9 years, height: 176.0 ± 8.8 cm, body mass: 71.3 ± 10.7 kg) were assessed for 1 repetition maximum (1RM) for deadlift (118.1 ± 27.3 kg) and bench press (58.2 ± 18.6 kg). Subsequently, they completed 3 identical sessions (one familiarization session and 2 testing sessions) comprising sets of 3, 5, and 8 repetitions. For each repetition scheme, the load was progressively increased in successive sets until subject...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Understanding Bench Press Biomechanics—The Necessity of Measuring Lateral Barbell Forces
In conclusion, all bench press variations may stimulate strength gains and hypertrophy of the elbow extensors and shoulder flexors and horizontal adductors. However, greater adaptations of the elbow extensors and shoulder flexors may be expected when selecting narrower grip widths, whereas wider grip widths may induce greater adaptations of the shoulder horizontal adductors. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Effect of Footwear on the Biomechanics of Loaded Back Squats to Volitional Exhaustion in Skilled Lifters
This study examined whether footwear influences the movement dynamics of barbell back squats to volitional exhaustion in experienced lifters. Eleven men (1 repetition maximum [1RM] = 138 ± 19 kg; 1RM % body mass = 168 ± 18%) performed 3 sets (5–12 ± 4 repetitions per set) of loaded barbell back squats to volitional exhaustion using raised-heel and flat-heel footwear. Barbell motion as well as moments, angles, angular velocity, and power in the sagittal plane at the ankle, knee, hip, and lumbopelvis were examined during the second repetition of the first set (Tsecond) and the final repetition of the third set (Tfinal)....
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Arousal/Stress Effects of “Overwatch” eSports Game Competition in Collegiate Gamers
Kraemer, WJ, Caldwell, LK, Post, EM, Beeler, MK, Emerson, A, Volek, JS, Maresh, CM, Fogt, JS, Fogt, N, Häkkinen, K, Newton, RU, Lopez, P, Sanchez, BN, and Onate, JA. Arousal/stress effects of “Overwatch” eSports game competition in collegiate gamers. J Strength Cond Res 36(10): 2671–2675, 2022—To date, no physical response data are available for one of the most popular eSport games, Overwatch. The purpose of this investigation was to describe the stress signaling associated with competitive Overwatch play and to understand how acute hormonal responses may affect performance. Thirty-two male college-aged gamers (ag...
Source: Journal of Strength and Conditioning Research - September 26, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
Efficacy of Alternative Forms of Creatine Supplementation on Improving Performance and Body Composition in Healthy Subjects: A Systematic Review
Fazio, C, Elder, CL, and Harris, MM. Efficacy of alternative forms of creatine supplementation on improving performance and body composition in healthy subjects: a systematic review. J Strength Cond Res 36(9): 2663–2670, 2022—Novel forms of creatine have appeared in the marketplace with substantial claims of improved efficacy compared to creatine monohydrate (CrM). The purpose of this study was to conduct a systematic review on alternative forms of creatine to determine (a) whether they are effective ergogenic aids and (b) whether they outperform CrM. A separate comparison was conducted to determine average cost of var...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Brief Review Source Type: research
Momentum-Based Load Prescriptions: Applications to Jump Squat Training
Harry, JR, Krzyszkowski, J, Harris, K, Chowning, L, Mackey, E, Bishop, C, and Barker, LA. Momentum-based load prescriptions: Applications to jump squat training. J Strength Cond Res 36(9): 2657–2662, 2022—Velocity-based training is often applied to ballistic exercises, like the barbell jump squat, to improve vertical jump performance. However, determining the ideal training load based on velocity data remains difficult because load prescriptions tend to be limited to subjective velocity loss thresholds, velocity ranges, or both. Using data from jump squats performed with 0, 15, 30, 45, and 60% of the 1-repetition maxim...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Technical Report Source Type: research
Total Body and Extracellular Water Measures Are Unrelated to Cramp Sensitivity in Euhydrated Cramp-Prone Individuals
Earp, JE, Stearns, RL, Agostinucci, J, Lepley, AS, and Ward-Ritacco, CL. Total body and extracellular water measures are unrelated to cramp sensitivity in euhydrated cramp-prone individuals. J Strength Cond Res 36(9): 2653–2656, 2022—Spectral bioelectrical impedance analysis (BIA) is a valid and noninvasive tool for measuring total body water (TBW), intracellular water (ICW), and extracellular water (ECW). As altered hydration and electrolyte imbalance have been proposed as one of 2 etiologies for exercise-associated muscle cramps (EAMC), the purpose of this study was to determine if distribution of body water is relat...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Short Research Report Source Type: research
Feasibility of High-Intensity Resistance Training Sessions in Cancer Survivors
Schlüter, K, Schneider, J, Rosenberger, F, and Wiskemann, J. Feasibility of high-intensity resistance training sessions in cancer survivors. J Strength Cond Res 36(9): 2643–2652, 2022—Moderate-intensity resistance training (MIRT) is regarded as safe in cancer survivors (CS), but for high-intensity resistance training (HIRT), evidence is lacking. Hence, in the current exploratory analyses, single sessions of HIRT are compared with MIRT regarding safety and feasibility. Twenty-three of 24 included CS (14 breast and 10 prostate CS, 61.6 ± 9.5 years, body mass index 27.0 ± 4.3 kg·m−2, 6–52 weeks after end of primar...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research
