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Journal of Strength and Conditioning Research

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https://www.readbyqxmd.com/read/28195935/allometric-grip-strength-norms-for-children-of-hawaiian-lineage
#1
Morgan H Kocher, Rebecca K Romine, Christopher D Stickley, Charles F Morgan, Portia B Resnick, Ronald K Hetzler
PURPOSE: To determine allometric exponents for scaling grip strength in children that effectively control for body mass and height and develop normative grip strength data for Hawaiian children. METHODS: 1,437 students (754 boys) from a rural community in Hawaii participated in this 5-year study, resulting in 2,567 data points. Handgrip strength, body mass (BM), stature (Ht) were collected every year. Multiple log-linear regression was used to determine allometric exponents for BM and Ht...
December 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28323792/the-effect-of-intermittent-vest-cooling-on-thermoregulation-and-cardiovascular-strain-in-baseball-catchers
#2
Stacy Bishop, David J Szymanski, Greg A Ryan, Robert L Herron, Phil A Bishop
Baseball catchers are exposed to multiple physiological challenges while playing outside during the spring and summer months, many of which deal with recovery and thermoregulation. The purpose of this study was to investigate the effect of intermittent cooling on core temperature, cardiovascular strain, exertion, and recovery during a simulated catching performance in the heat. Six trained college-aged baseball catchers performed in a controlled, hot (35 °C) and humid (25% relative humidity) environment in a counter-balanced, cross-over design...
March 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301444/hemodynamic-and-cardiorespiratory-predictors-of-sport-rock-climbing-performance
#3
Simon Fryer, David Giles, Inmaculada Garrido Palomino, Alejandro de la O Puerta, Vanesa España Romero
Rock climbing performance has been suggested to involve a notable contribution from the 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 climbing performance. The aim of the study was to determine whether forearm oxidative capacity index, maximal de-oxygenation (Δ score) during a treadwall V[Combining Dot Above]O[SUBSCRIPT TWO]peak test, treadwall V[Combining Dot Above]O[SUBSCRIPT TWO]peak, or running V[Combining Dot Above]O[SUBSCRIPT TWO]max best predicts self-reported sport climbing performance...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301443/can-neck-strength-be-measured-using-a-single-maximal-contraction-in-a-simulated-contact-position
#4
Danielle M Salmon, Phil Handcock, S John Sullivan, Nancy J Rehrer, Brian Niven
Neck strengthening has been postulated to potentially reduce the incidence/severity of concussions and neck injuries in collision based sports. A quick and reliable method to assess neck strength would permit identification of those at risk and tracking of progress following injury. The purpose of this study was to determine if neck strength could be reliably assessed in a simulated contact posture using a single maximal contraction. During a single session 30 healthy male university students performed 3 maximal voluntary contractions of the neck musculature in each of the following directions: extension (Ext), flexion (Flx), left (LtFlx), and right lateral flexion (RtFlx)...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301442/effect-of-ankle-mobility-and-segment-ratios-on-trunk-lean-in-the-barbell-back-squat
#5
Emil Isager Fuglsang, Anders Stampe Telling, Henrik Sørensen
The barbell back squat is a popular exercise used for both performance enhancing and rehabilitation purposes. However, injuries are common and people with a history of lower back pain are especially vulnerable. Past studies have shown that higher trunk angles (less forward lean) generate less stress on the lower back; thus, it seems appropriate to investigate the factors presumed to influence the trunk angle. Therefore, the aim in this study was to investigate how ankle mobility and the segment ratios between the thoracic spine, thighs and shanks influence the trunk angle in the back squat...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301441/predictors-of-linear-and-multidirectional-acceleration-in-elite-soccer-players
#6
Northeast Jonathan, M Russell, D Shearer, C Cook, L Kilduff
Linear and multidirectional acceleration underpins success in professional soccer match-play. However, the physical qualities that determine these performance indicators are poorly understood in elite players. English Premier League players (n=26) performed isometric mid-thigh pulls (IMTP), bilateral and unilateral drop jumps (DJ; from 40 and 20 cm, respectively), bilateral and unilateral countermovement jumps (CMJ) and assessments of linear (5-, 10-, 20-m) and multidirectional (left/right pre-planned and reactive) acceleration...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301440/changes-in-body-composition-and-performance-with-supplemental-hmb-fa-atp
#7
Stuart M Phillips, Alan A Aragon, Paul J Arciero, Shawn M Arent, Graeme L Close, D Lee Hamilton, Eric R Helms, Menno Henselmans, Jeremy P Loenneke, Layne E Norton, Michael J Ormsbee, Craig Sale, Brad J Schoenfeld, Abbie E SmithRyan, Kevin D Tipton, Matthew D Vukovich, Colin Wilborn, Darryn S Willoughby
No abstract text is available yet for this article.
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301439/efficacy-of-the-repetitions-in-reserve-based-rating-of-perceived-exertion-for-the-bench-press-in-experienced-and-novice-benchers
#8
Michael J Ormsbee, Joseph P Carzoli, Alex Klemp, Brittany R Allman, Michael C Zourdos, Jeong-Su Kim, Lynn B Panton
Autoregulation (AR) is the practice of adjusting training variables in response to athlete feedback. One component of AR postulated to enhance resistance training adaptations involves implementing a resistance training-specific rating of perceived exertion (RPE) scale measuring repetitions in reserve (RIR). The purpose of this study was to examine the efficacy of this method using the bench press exercise. METHODS: Twenty-seven college-aged men were assigned to one of two groups based upon training age: experience benchers (EB) (n=14, training age: 4...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301438/effects-of-12-week-concurrent-high-intensity-interval-strength-and-endurance-training-programme-on-physical-performance-in-healthy-older-people
#9
Felipe García-Pinillos, José A Laredo-Aguilera, Marcos Muñoz-Jiménez, Pedro A Latorre-Román
This study aimed to analyse the effect of 12-week low-volume HIIT-based concurrent training programme on body composition, upper- and lower-body muscle strength, mobility and balance in older adults, as well as to compare it with a low- moderate-intensity continuous training. 90 active older adults were randomly assigned to experimental (EG, n=47), and control (CG, n=43) groups. Body composition and physical functioning were assessed before (pre-test) and after (post-test) a 12-week intervention. A 2-way repeated measures ANOVA was used to test for an interaction between training programme and groups...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301437/transient-fatigue-is-not-influenced-by-ball-in-play-time-during-elite-rugby-league-matches
#10
M Waldron, E Thomson, J Highton, C Twist
The capacity to sustain high-speed running is important for rugby league players. Transient fatigue, described as a reduction in high-speed running in the 5-min after a peak 5-min period, is a phenomenon observed during rugby league matches. This concept has recently been questioned based on the proposed confounding influence of ball-in-play time during these periods. Therefore, this study examined the changes in high-speed running (> 14 km[BULLET OPERATOR]h) of elite rugby league players, as well as ball-in-play time, during the peak, subsequent and mean 5-min periods of five competitive matches using 5 Hz GPS devices...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301436/the-effects-of-recovery-duration-during-high-intensity-interval-exercise-on-time-spent-at-high-rates-of-oxygen-consumption-oxygen-kinetics-and-blood-lactate
#11
Ilias Smilios, Aristides Myrkos, Andreas Zafeiridis, Argyris Toubekis, Apostolos Spassis, Savas P Tokmakidis
The recovery duration and the work to recovery ratio are important aspects to consider when designing a high-intensity aerobic interval exercise (HIIE). This study examined the effects of recovery duration on total exercise time performed above 80, 90 and 95% of maximum oxygen consumption (VO2max) and heart rate (HRmax) during a single-bout HIIE. We also evaluated the effects on VO2 and HR kinetics, blood lactate concentration and rating of perceived exertion (RPE). Eleven moderately trained males (22.1±1 yrs...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301435/different-cluster-sets-result-in-similar-metabolic-endocrine-and-perceptual-responses-in-trained-men
#12
James J Tufano, Jenny A Conlon, Sophia Nimphius, Jonathan M Oliver, Andreas Kreutzer, G Gregory Haff
The purpose of this study was to compare the kinematic, metabolic, endocrine, and perceptual responses of three back squat protocols with equal loads, number of repetitions, and total rest duration. Eight strength-trained men performed 36 back squats using 75% 1RM and 420 s of total rest during basic cluster sets of 4 (CS4), rest-redistribution sets of 4 (RR4), and rest-redistribution sets of 1 (RR1). Ratings of perceived exertion (RPE), blood lactate (La), mean velocity maintenance (MVM), and mean velocity loss (MVL) were measured during exercise...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301434/comparison-of-circumference-measures-and-height-weight-tables-with-dual-energy-x-ray-absorptiometry-assessment-of-body-composition-in-r-o-t-c-cadets
#13
Kelly L Pritchett, Katherine M Mitchell, Robert C Pritchett, David L Gee
Height-weight tables and circumference measures are used by the U.S. Army to predict body composition because they require little equipment/expertise. However, agreement between the Army's new 2002 circumference equation and an established laboratory technique has not been determined. The purpose of this study was to quantify agreement in body fat percentages between the Army's circumference measures (taping) and dual-energy x-ray absorptiometry (DXA); second to determine categorical agreement between height-weight tables and DXA...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301433/a-comparison-of-bilateral-muscular-imbalance-ratio-calculations-using-functional-tests
#14
Theodoros M Bampouras, Susan Dewhurst
Bilateral muscular imbalance can increase the risk of injury and negatively impact sporting performance. Bilateral muscular imbalances are typically calculated as ((side 1-side 2)/reference value) x 100, to provide a percentage value of the difference between limbs. Using different numerator (right-left or strong-weak) or reference values (left, right, strong, weak, average of the two) could mask or inflate the true difference value. The present study aimed to compare the bilateral muscular imbalance ratio calculations, using the absolute difference between limbs as the numerator and the five different options as reference values...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277433/changes-in-unilateral-upper-limb-muscular-strength-and-emg-activity-following-a-16-week-strength-training-intervention-survivors-of-breast-cancer
#15
Amanda D Hagstrom, Kathleen A Shorter, Paul W M Marshall
Upper limb strength deficits are frequently observed following breast cancer and its treatments. It is currently unknown whether these unilateral deficits can be corrected by a standard bilateral strength training intervention. Twenty three survivors of breast cancer were included in this analysis. Fourteen performed a 16 week resistance training (RT) intervention, 9 were assigned to a usual care waitlist control group. Electromyographic (EMG) analysis of the pectoralis major and triceps brachii were monitored during three maximal isometric contractions and a fatiguing endurance task...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277432/physiological-factors-associated-with-declining-repeated-sprint-performance-in-hypoxia
#16
Hannes Gatterer, Verena Menz, Christian Untersteiner, Kultida Klarod, Martin Burtscher
Performance loss in hypoxia might not only be caused by reduced oxygen availability, but might also be influenced by other factors, as for example oxidative stress, perceived exertion or breathing patterns. This study aimed to investigate the influence of these factors on running performance during hypoxic and normoxic shuttle-run sprinting. Eight male amateur soccer players performed shuttle-run sprints in hypoxia (FiO2∼14.8%) and normoxia (random order). Each session comprised 3-sets of 5x10s back and forth sprints (4...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277431/validity-of-single-beam-timing-lights-at-different-heights
#17
Stefan Altmann, Max Spielmann, Florian Engel, Rainer Neumann, Steffen Ringhof, Doris Oriwol, Sascha Haertel
The purpose of this study was to quantify the effect of different timing light heights on sprint time and the validity of measurement. Two single beam timing gate systems were used to measure 30-m sprint time (splits at 5 m and 10 m) in 15 healthy and physically active male subjects. System 1 was set up at a height of 0.64 m, system 2 at 0.25 m (initial timing light) and 1.00 m (each following timing light), respectively. Participants performed three valid trials. The recordings of a high-speed video camera were used as a reference...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277430/perceived-exertion-is-affected-by-the-submaximal-set-configuration-used-in-resistance-exercise
#18
Mayo Xian, Iglesias-Soler Eliseo, Kingsley J Derek
Previously, perceived exertion in submaximal resistance exercise protocols was reported to be affected by the intensity of load followed by work-to-rest ratio. Nevertheless, the effect of set configuration, which entails the metabolic, hormonal, and neuromuscular implication of the session is currently unknown, despite that perceived exertion discriminates these differences. We aimed to analyze the effect of three submaximal set configurations on perceived exertion and their relationship with velocity as a mechanical measure of fatigue...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277429/the-influence-of-exercise-to-rest-ratios-on-physical-and-physiological-performance-during-hurling-specific-small-sided-games
#19
Shane Malone, Brian Hughes, Kieran Collins
The current study examined the impact of different exercise to rest ratios on hurling specific small-sided games (SSG). Thirty-four (n = 34) hurling players were monitored during an in-season training period. Heart rate (Polar Electro Oy, Kempele, Finland) and global positioning system technology (VX Sport, 4-Hz, Lower Hutt, New Zealand) were used to analyse the physical and physiological differences between exercise to rest ratios across bouts of SSG. Total distance (m) high-speed distance (m) (≥17 km·h), very high-speed distance (≥22 km·h) (m), total accelerations (n), acceleration distance (m), peak velocity (km·h) and % maximum heart rate (%HRmax) were measured...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277428/body-composition-and-bone-mineral-density-of-division-1-collegiate-football-players-a-consortium-of-college-athlete-research-c-car-study
#20
Tyler A Bosch, Aaron Carbuhn, Philip R Stanforth, Jonathan M Oliver, Kathryn A Keller, Donald R Dengel
The purpose of the present study was to generate normative data for total and regional body composition in Division 1 collegiate football players using dual-energy X-ray absorptiometry (DXA) and examine positional differences in total and regional measurements. Data was used from the Consortium of College Athlete Research (C-CAR) group. Four hundred-sixty-seven players were included in this study. Height, weight, total and regional fat mass, lean mass and bone mineral density were measured in each athlete in the preseason (June-August)...
March 8, 2017: Journal of Strength and Conditioning Research
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