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https://www.readbyqxmd.com/read/28933713/adaptations-associated-with-an-after-school-strength-and-conditioning-program-in-middle-school-aged-boys-a-quasi-experimental-design
#1
Brennan J Thompson, Matt S Stock, Jacob A Mota, Alexander S Drusch, Ryan N DeFranco, Tyler R Cook, Matthew A Hamm
Thompson, BJ, Stock, MS, Mota, JA, Drusch, AS, DeFranco, RN, Cook, TR, and Hamm, MA. Adaptations associated with an after-school strength and conditioning program in middle-school aged boys: a quasi-experimental design. J Strength Cond Res 31(10): 2840-2851, 2017-High-intensity strength and conditioning programs aimed at improving youth performance are becoming increasingly prevalent. The purpose of this study was to investigate the effects of a 16-week after-school strength and conditioning program on performance and body composition in middle-school-aged boys...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933024/effects-of-rest-interval-duration-in-resistance-training-on-measures-of-muscular-strength-a-systematic-review
#2
REVIEW
Jozo Grgic, Brad J Schoenfeld, Mislav Skrepnik, Timothy B Davies, Pavle Mikulic
BACKGROUND: Rest interval (RI) duration is an important resistance-training variable underlying gain in muscular strength. Recommendations for optimal RI duration for gains in muscular strength are largely inferred from studies examining the acute resistance training effects, and the generalizability of such findings to chronic adaptations is uncertain. OBJECTIVE: The goals of this systematic literature review are: (i) to aggregate findings and interpret the studies that assessed chronic muscular strength adaptations to resistance training interventions involving different RI durations, and (ii) to provide evidence-based recommendations for exercise practitioners and athletes...
September 20, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28922211/acute-effects-of-ammonia-inhalants-on-strength-and-power-performance-in-trained-men
#3
Sandro Bartolomei, Federico Nigro, Gubellini Luca, Semprini Gabriele, Simone Ciacci, Jay R Hoffman, Franco Merni
The aim of the present study was to investigate the influence of ammonia inhalants on lower body power and maximal isometric strength in trained men. Twenty experienced resistance trained men (age = 26.7 ± 3.7 y; body weight = 80.59 ± 9.0 kg; body height = 179.5 ± 5.7 cm) were tested for counter movement jump power (CMJP), maximal force and rate of force development (pRFD20) expressed during an isometric mid-thigh pull (IMTP). Assessments were performed using either an ammonia salt inhalants (AI), a placebo (PL) or no inhalants (N)...
September 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28918566/understanding-the-science-of-resistance-training-an-evolutionary-perspective
#4
William J Kraemer, Nicholas A Ratamess, Shawn D Flanagan, Jason P Shurley, Janice S Todd, Terry C Todd
The history of resistance training research began with anecdotal ideas and a slow growth of research from the late 1890s through the 1970s. The mid-1970s were a nexus point when resistance training studies evolved from just strength assessments to importance in physiological systems, physical health, and physical performance capabilities for individuals interested in physical fitness through to those seeking elite athletic performances. The pursuit of understanding program design and what mediated successful programs continues today as new findings, replication of old concepts, and new visions with the latest technologies fuel both our understanding and interest in this modality...
September 16, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28917030/the-role-of-intra-session-exercise-sequence-in-the-interference-effect-a-systematic-review-with-meta-analysis
#5
REVIEW
Lee Eddens, Ken van Someren, Glyn Howatson
BACKGROUND: There is a necessity for numerous sports to develop strength and aerobic capacity simultaneously, placing a significant demand upon the practice of effective concurrent training methods. Concurrent training requires the athlete to perform both resistance and endurance exercise within a training plan. This training paradigm has been associated with an 'interference effect', with attenuated strength adaptation in comparison to that following isolated resistance training. The effectiveness of the training programme rests on the intricacies of manipulating acute training variables, such as exercise sequence...
September 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28902119/determination-of-vertical-jump-as-a-measure-of-neuromuscular-readiness-and-fatigue
#6
Casey M Watkins, Saldiam R Barillas, Megan A Wong, David C Archer, Ian J Dobbs, Robert G Lockie, Jared W Coburn, Tai T Tran, Lee E Brown
Coaches closely monitor training loads and periodize sessions throughout the season to create optimal adaptations at the proper time. However, only monitoring training loads ignores the innate physiological stress each athlete feels individually. Vertical jump (VJ) is widely used as a measure of lower body power, and has been used in post-match studies to demonstrate fatigue levels. However, no pre-training monitoring via VJ performance has been previously studied. Therefore, the purpose of this study was to determine the sensitivity of VJ as a measure of readiness and fatigue on a daily sessional basis...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28902107/reliability-of-the-maximal-resisted-sprint-load-test-and-relationships-with-performance-measures-and-anthropometric-profile-in-female-field-sport-athletes
#7
George Petrakos, Nicola C Tynan, Adam M Vallely-Farrell, Cillian Kiely, Abdelhak Boudhar, Brendan Egan
Resisted sled sprint (RSS) training is an effective modality for the improvement of linear sprint speed. Previous methods of RSS load prescription e.g. an absolute load or as a percentage of body mass (%BM), do not account for inter-individual differences in strength, power or speed characteristics, although the 'maximum resisted sled load' (MRSL) method of RSS load prescription may provide a solution. MRSL is defined as the final RSS load before an athlete can no longer accelerate between two phases (10-15 m and 15-20 m) of a 20 m linear sprint...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28892463/effect-of-different-velocity-loss-thresholds-during-a-power-oriented-resistance-training-program-on-the-mechanical-capacities-of-lower-body-muscles
#8
Alejandro Pérez-Castilla, Amador García-Ramos, Paulino Padial, Antonio J Morales-Artacho, Belén Feriche
This study compared the effects of two velocity loss thresholds during a power-oriented resistance training program on the mechanical capacities of lower-body muscles. Twenty men were counterbalanced in two groups (VL10 and VL20) based on their maximum power capacity. Both groups used the same exercises, relative intensity and repetition volume, only differing in the velocity loss threshold of each set (VL10: 10% vs. VL20: 20%). Pre- and post-training assessments included an incremental loading test and a 15-m linear sprint to assess the force- and load-velocity relationships and athletic performance variables, respectively...
September 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28858058/resistance-training-is-associated-with-higher-lumbar-spine-and-hip-bone-mineral-density-in-competitive-male-cyclists
#9
Shannon L Mathis, Jennifer L Caputo
In contrast to other athletic activities, competitive cycling is associated with low areal bone mineral density (BMD). This investigation evaluated training and dietary factors associated with BMD in a sample of competitive male cyclists. Lumbar spine, total hip, femoral neck, and femoral trochanter BMD were measured with dual x-ray absorptiometry in 40 cyclists at the start of a cycling season. Participants reported weekly hours of cycling and weight training, years of competitive cycling experience, and completed a one-day dietary recall to allow estimation of dietary calcium intake...
August 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28858051/long-term-changes-in-jump-performance-and-maximum-strength-in-a-cohort-of-ncaa-division-i-women-s-volleyball-athletes
#10
Ashley A Kavanaugh, Satoshi Mizuguchi, William A Sands, Michael W Ramsey, Michael H Stone
The purpose of this investigation was to quantify the magnitude of change in maximal strength and jumping abilities over approximately one, two, and three years of supervised sport and resistance training in NCAA Division I women's volleyball athletes. This was an exploratory study on a cohort of women's volleyball athletes (n=29) split into three groups based on length of time spent in a supervised resistance training program: group 1 (n=11): 0.7±0.3 yrs, group 2 (n=9): 1.6±0.2 yrs, and group 3 (n=9): 2...
August 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796130/the-effects-of-superset-configuration-on-kinetic-kinematic-and-perceived-exertion-in-the-barbell-bench-press
#11
Jonathon Js Weakley, Kevin Till, Dale B Read, Padraic J Phibbs, Gregory Roe, Joshua Darrall-Jones, Ben L Jones
Training that is efficient and effective is of great importance to an athlete. One method of improving efficiency is by incorporating supersets into resistance training routines. However, the structuring of supersets is still unexplored. Therefore, the purpose of this study was to assess the effects of agonist-antagonist (A-A), alternate peripheral (A-P), and similar biomechanical (SB) superset configurations on rate of perceived exertion (RPE), kinetic and kinematic changes during the bench press. 10 subjects performed resistance training protocols in a randomized-crossover design, with magnitude-based inferences assessing changes/differences within and between protocols...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28795003/resistance-training-for-children-and-adolescents
#12
REVIEW
Allison M Myers, Nicholas W Beam, Joseph D Fakhoury
As more children and adolescents are becoming involved in exercise and school or community based athletics, attention is turned towards proper training and conditioning to optimize performance, stimulate athletic development and ensure safety while tolerating long-term competition. Resistance training (RT) refers to the methodology of ensuring such optimal performance and safety. This is a common component of sports and physical fitness in schools and organized athletic programs around the country. RT is a physical conditioning program that involves various training techniques (e...
July 2017: Translational pediatrics
https://www.readbyqxmd.com/read/28792857/redistributing-load-using-wearable-resistance-during-power-clean-training-improves-athletic-performance
#13
Caleb R Marriner, John B Cronin, Paul Macadam, Adam Storey
A popular method to improve athletic performance and lower body power is to train with wearable resistance (WR), for example, weighted vests. However, it is currently unknown what training effect this loading method has on full-body explosive movements such as the power clean. The purpose of this study was to determine what effects WR equivalent to 12% body mass (BM) had on the power clean and countermovement jump (CMJ) performance. Sixteen male subjects (age: 23.2 ± 2.7 years; BM: 90.5 ± 10.3 kg) were randomly assigned to five weeks of traditional (TR) power clean training or training with 12% BM redistributed from the bar to the body using WR...
October 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28759532/wrist-resistance-training-improves-motor-control-and-strength
#14
Edward Chu, You-Sin Kim, Genevieve Hill, Yoon Hyuk Kim, Chang Kook Kim, Jae Kun Shim
The aim of the present study was to investigate the effects of a 6-week direction specific resistance training program on isometric torque control and isokinetic torque strength of the wrist joint. Nineteen subjects were randomly assigned to either the wrist training group (n=9) or the control group (n=10). The training group performed wrist exercises in six directions (flexion, extension, pronation, supination, radial deviation, and ulnar deviation) while the control group did not. Data were collected on the isometric torque control, one-repetition maximum (1-RM) strength, and isokinetic maximum torque (angular velocity of 60°/s wrist movements) before and after six weeks of resistance training and at two-week intervals during training...
July 28, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28748371/acute-effects-of-heated-resistance-exercise-in-female-and-male-power-athletes
#15
Julia R Casadio, Adam G Storey, Fabrice Merien, Andrew E Kilding, James D Cotter, Paul B Laursen
PURPOSE: To determine the effects of heated resistance exercise on thermal strain, neuromuscular function and hormonal responses in power athletes. METHODS: Sixteen (n = 8 female; 8 male) highly trained power athletes completed a combined strength and power resistance exercise session in hot (HOT ~30 °C) and temperate (CON ~20 °C) conditions. Human growth hormone (hGH), cortisol and testosterone concentrations in plasma, peak power (counter-movement jump, CMJ) and peak force (isometric mid-thigh pull) were measured before and after each training session; thermoregulatory responses were monitored during training...
July 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28738856/acute-changes-in-blood-lipid-profiles-and-metabolic-risk-factors-in-collegiate-elite-taekwondo-athletes-after-short-term-de-training-a-prospective-insight-for-athletic-health-management
#16
Yu-Chi Sung, Yi-Hung Liao, Chung-Yu Chen, Yu-Liang Chen, Chun-Chung Chou
BACKGROUND: This study used a short-term de-training model to mimic the physiological weight changes during the early retirement stage in Taekwondo (TKD) athletes. This study investigates whether the negative changes in body composition, blood lipid profiles, and metabolic biomarkers occur in elite collegiate TKD athletes when experiencing a two-months de-training period. METHODS: Fourteen collegiate Division Ι elite TKD athletes (age: 21.1 ± 0.2 years, BMI: 22...
July 24, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28737609/the-effects-of-supplementary-low-load-blood-flow-restriction-training-on-morphological-and-performance-based-adaptations-in-team-sport-athletes
#17
Brendan R Scott, Jeremiah J Peiffer, Paul S R Goods
Scott, BR, Peiffer, JJ, and Goods, PSR. The effects of supplementary low-load blood flow restriction training on morphological and performance-based adaptations in team sport athletes. J Strength Cond Res 31(8): 2147-2154, 2017-Low-load resistance training with blood flow restriction (BFR) may be a method to enhance muscular development even in trained athletes. This study aimed to assess whether supplemental low-load BFR training can improve muscle size, strength, and physical performance characteristics in team sport athletes...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28704314/visual-feedback-attenuates-mean-concentric-barbell-velocity-loss-and-improves-motivation-competitiveness-and-perceived-workload-in-male-adolescent-athletes
#18
Jonathon Js Weakley, Kyle M Wilson, Kevin Till, Dale B Read, Joshua Darrall-Jones, Gregory Roe, Padraic J Phibbs, Ben Jones
It is unknown whether instantaneous visual feedback of resistance training outcomes can enhance barbell velocity in younger athletes. Therefore, the purpose of this study was to quantify the effects of visual feedback on mean concentric barbell velocity in the back squat, and to identify changes in motivation, competitiveness, and perceived workload. In a randomised-crossover design (Feedback vs. Control) feedback of mean concentric barbell velocity was or was not provided throughout a set of 10 repetitions in the barbell back squat...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28698987/the-effects-of-traditional-superset-and-tri-set-resistance-training-structures-on-perceived-intensity-and-physiological-responses
#19
Jonathon J S Weakley, Kevin Till, Dale B Read, Gregory A B Roe, Joshua Darrall-Jones, Padraic J Phibbs, Ben Jones
PURPOSE: Investigate the acute and short-term (i.e., 24 h) effects of traditional (TRAD), superset (SS), and tri-set (TRI) resistance training protocols on perceptions of intensity and physiological responses. METHODS: Fourteen male participants completed a familiarisation session and three resistance training protocols (i.e., TRAD, SS, and TRI) in a randomised-crossover design. Rating of perceived exertion, lactate concentration ([Lac]), creatine kinase concentration ([CK]), countermovement jump (CMJ), testosterone, and cortisol concentrations was measured pre, immediately, and 24-h post the resistance training sessions with magnitude-based inferences assessing changes/differences within/between protocols...
July 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28662108/short-term-adaptations-following-complex-training-in-team-sports-a-meta-analysis
#20
Tomás T Freitas, Alejandro Martinez-Rodriguez, Julio Calleja-González, Pedro E Alcaraz
OBJECTIVE: The purpose of this meta-analysis was to study the short-term adaptations on sprint and vertical jump (VJ) performance following Complex Training (CT) in team-sports. CT is a resistance training method aimed at developing both strength and power, which has a direct effect on sprint and VJ. It consists on alternating heavy resistance training exercises with plyometric/power ones, set for set, on the same workout. METHODS: A search of electronic databases up to July 2016 (PubMed-MEDLINE, SPORTDiscus, Web of Knowledge) was conducted...
2017: PloS One
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