Effects of Integrative Neuromuscular Training on Motor Performance in Prepubertal Soccer Players
Menezes, GB, Alexandre, DR, Pinto, JC, Assis, TV, Faigenbaum, AD, and Mortatti, AL. Effects of integrative neuromuscular training on motor performance in prepubertal soccer players. J Strength Cond Res 36(6): 1667–1674, 2022—The present study examined the effects of integrative neuromuscular training (INT) on motor performance in prepubertal soccer players. Subjects were randomly assigned to the experimental group (INT; n = 20, age: 8.2 ± 1.2 years; body mass: 28.4 ± 6.4 kg; height: 1.3 ± 0.1 m) or the control group (CON; n = 18, age: 8.5 ± 1.3 years; body mass: 32.8 ± 8.9 kg; height: 1.3 ± 0.1 m). Integrative ne...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Bilateral vs. Unilateral Countermovement Jumps: Comparing the Magnitude and Direction of Asymmetry in Elite Academy Soccer Players
Bishop, C, Abbott, W, Brashill, C, Turner, A, Lake, J, and Read, P. Bilateral vs. unilateral countermovement jumps: comparing the magnitude and direction of asymmetry in elite academy soccer players. J Strength Cond Res 36(6): 1660–1666, 2022—The aims of this study were to compare the magnitude and direction of asymmetry in comparable bilateral and unilateral countermovement jumps (CMJs). Forty-five elite academy soccer players from under-23 (n = 15), under-18 (n = 16), and under-16 (n = 14) age groups performed bilateral and unilateral CMJs as part of their routine preseason fitness testing. For the magnitude of asymm...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

A Congested Match Schedule Alters Internal Match Load and Affects Salivary Immunoglobulin A Concentration in Youth Soccer Players
Mortatti, AL, Oliveira, RSCd, Pinto, JCBdL, Galvão-Coelho, NL, Almeida, RN, Aoki, MS, and Moreira, A. A congested match schedule alters internal match load and affects salivary immunoglobulin A concentration in youth soccer players. J Strength Cond Res 36(6): 1655–1659, 2022—The aim of this study was to analyze the effects of a congested match schedule (CMS) undertaken after a tapering week, on internal match load (IML) and salivary immunoglobulin A (SIgA) concentration in 12 youth soccer players (16.6 ± 0.5 years; 175 ± 8 cm; 65 ± 8 kg) who performed 4 official matches within a 4-day period. Internal match load wa...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Psychophysiological Stress Markers During Preseason Among Elite Female Soccer Players
This study aimed to investigate changes and correlations between mood states and various physiological stress markers after a 7-week preseason period among elite female soccer players. Twenty-four elite female soccer players participated in this study (26.4 ± 3.7 years). Their internal training load, mood states, day and evening salivary testosterone and cortisol concentrations, blood creatine kinase concentration (CK), and heart rate variability (HRV) were assessed during the first week of preseason (PRE), and again 7 weeks after a systematic training period (END). After the preseason, there were significant increases in...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

The Effects of Physical Fitness on Postactivation Potentiation in Professional Soccer Athletes
Guerra, MA Jr, Caldas, LA, Souza, HL, Tallis, J, Duncan, MJ, and Guimarães-Ferreira, L. The effects of physical fitness on postactivation potentiation in professional soccer athletes. J Strength Cond Res 36(6): 1643–1647, 2022—To investigate the relationship of the response to postactivation potentiation (PAP) with scores of physical fitness. Twenty-four professional male soccer players undertook tests of agility, muscular power, aerobic capacity, and body composition. Conditioning activities (CAs) were performed consisting of plyometrics exercises and sprints with sled towing. In the first and second sessions, body c...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Reduced Dose of Beta-Alanine Is Sufficient to Maintain Performance in Repeated Sprints
Zandona, BA, Ramos, RA, de Oliveira, CdS, McAnulty, SR, Ferreira, LHB, Smolarek, AC, Enes, AAN, Urbinati, KMdSS, Aragon, AA, Schoenfeld, BJ, and de Souza Junior, TP. Reduced Dose of Beta-Alanine Is Sufficient to Maintain Performance in Repeated Sprints. J Strength Cond Res 36(6): 1636–1642, 2022—Beta-alanine (BA) supplementation has been shown to be effective in improving physical performance by increasing carnosine concentration. However, it is still necessary to know the effect of a maintenance dose on performance. Thus, this study aimed to investigate the effects of a maintenance dose of BA supplementation on perfor...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Muscle Cramping in the Marathon: Dehydration and Electrolyte Depletion vs. Muscle Damage
Martínez-Navarro, I, Montoya-Vieco, A, Collado, E, Hernando, B, Panizo, N, and Hernando, C. Muscle Cramping in the marathon: Dehydration and electrolyte depletion vs. muscle damage. J Strength Cond Res 36(6): 1629–1635, 2022—Our aim was to compare dehydration variables, serum electrolytes, and muscle damage serum markers between runners who suffered exercise-associated muscle cramps (EAMC) and runners who did not suffer EAMC in a road marathon. We were also interested in analyzing race pacing and training background. Nighty-eight marathoners took part in the study. Subjects were subjected to a cardiopulmonary exercise...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Effect of Divergent Solar Radiation Exposure With Outdoor Versus Indoor Training in the Heat: Implications for Performance
O'Connor, FK, Doering, TM, Minett, GM, Reaburn, PR, Bartlett, JD and Coffey, VG. Effect of divergent solar radiation exposure with outdoor versus indoor training in the heat: implications for performance. J Strength Cond Res 36(6): 1622–1628, 2022—The aim of this study was to determine physiological and perceptual responses and performance outcomes when completing high-intensity exercise in outdoor and indoor hot environments with contrasting solar radiation exposure. Seven cyclists and 9 Australian Football League (AFL) players undertook cycling trials in hot conditions (≥30 °C) outdoors and indoors. Cyclists compl...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Relationship Between Strength and Conditioning Assessments and Rowing Performance in Female Collegiate Athletes
This study highlights that the 1RM squat may be a way to predict rowing performance and build successful female collegiate rowing teams. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

A‐Mode Ultrasound Reliability in Fat and Muscle Thickness Measurement
This study aimed to verify the reliability of the BodyMetrix portable A-mode ultrasound in measuring fat and muscle tissue thickness. Thirty physically active men participated in daily body composition evaluations. The evaluations comprised 2 techniques: (a) graphic technique (GTBM), which measured the fat thickness at 9 body sites (abdomen, axillary, biceps brachii, calf, chest, subscapular, suprailiac, thigh, and triceps brachii), and (b) imaging technique (ITBM), which simultaneously measured the fat and muscle thickness of 6 body surfaces (abdomen, biceps brachii, chest, thigh, trapezius, and triceps brachii). Regardin...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Validity, Reliability, and Sensitivity to Exercise-Induced Fatigue of a Customer-Friendly Device for the Measurement of the Brain's Direct Current Potential
This study aimed to determine the validity, reliability, and sensitivity to exercise-induced fatigue of the brain's direct current (DC) potential measured with a commercially available and customer-friendly electroencephalography (EEG) device and Omegawave (OW). The study was composed of 3 different experiments as follows: (a) we compared the DC potential values obtained simultaneously in 31 subjects with both OW and a research-quality EEG system; (b) 3 consecutive DC potential measurements with OW were taken at rest on the same day in 25 subjects for reliability analyses; and (c) sensitivity to fatigue was assessed in 9 e...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

HIF-1α and NFIA-AS2 Polymorphisms as Potential Determinants of Total Hemoglobin Mass in Endurance Athletes
In conclusion, our study indicates that NFIA-AS2 rs1572312:C>A polymorphism was associated with hematological status in endurance athletes, as well as aerobic capacity indices in male cyclists. It suggests that this polymorphism may be a determinant of quantity of hemoglobin and intrtavascular volumes, which in turn can have an impact on aerobic performance. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Interaction Between ACTN3 (R577X), ACE (I/D), and BDKRB2 (−9/+9) Polymorphisms and Endurance Phenotypes in Brazilian Long-Distance Swimmers
This study investigated the interactions between the polymorphisms ACTN3 (R577X), ACE (I/D), and BDKRB2 (−9/+9) and their association with endurance phenotypes in Brazilian long-distance swimmers. Twenty-six volunteers (aged 18–30 years) were divided into 2 groups as follows: 19 subelite athletes formed the pool swimming experts (PSE: 400–1500 m) group and 7 elite athletes the open water swimming experts (OWSE: 5–25 km) group. ACTN3 (R577X), ACE (I/D), and BDKRB2 (−9/+9) polymorphisms were genotyped through polymerase chain reaction. A nonathletes control (CON) group derived from studies with the Brazilian popula...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Resistance Training at Different Loads on Inflammatory Biomarkers, Muscle Mass, Muscular Strength, and Physical Performance in Postmenopausal Women
Carneiro, MAS, de Oliveira Júnior, GN, de Sousa, JFR, Murta, EFC, Orsatti, CL, Michelin, MA, Cyrino, ES, and Orsatti, FL. Effects of resistance training at different loads on inflammatory biomarkers, muscle mass, muscular strength, and physical performance in postmenopausal women. J Strength Cond Res 36(6): 1582–1590, 2022—It has been suggested that the effect of resistance training (RT) on circulating proinflammatory biomarkers may be dependent on muscle mass gain. A few recent studies have suggested that lower-load RT (LLRT; loads 70% of 1RM) in increasing muscle mass. Hence, this study aimed to test whether LLRT is...
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Low-Load Resistance Training to Volitional Failure Induces Muscle Hypertrophy Similar to Volume-Matched, Velocity Fatigue
In conclusion, low-load RT to volitional failure induces muscle hypertrophy similar to volume-matched velocity fatigue. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - June 1, 2022 Category: Sports Medicine Tags: Original Research Source Type: research