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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/28820858/technical-and-tactical-aspects-in-italian-youth-rugby-union-in-relation-to-different-academies-regional-tournaments-and-outcomes
#2
Alexandru Nicolae Ungureanu, Giancarlo Condello, Simonluca Pistore, Daniele Conte, Corrado Lupo
This study aimed to analyze the technical and tactical aspects of the Italian under-18 Academy Rugby Union in relation to different academies, regional tournaments, and game outcomes. A notational analysis (forty-four indicators) was performed on 16 games (2014-15 season) to evaluate strong differences (P ≤ 0.05; moderate-large effect sizes) according to variables. Among academies, strong differences were showed for defensive breakdown where the defending support is much (range=77-87%), equal (range=11-32%), and less (range=2-12%) numerous than the attacking support, total tackles (range=64-122) and passes (range=72-151), pass to possession ratio (range=6-10), possession lost due to an error (range=28-59%), and ball in play in own (range=8-25%) and opponent (range=7-31%) 22m area indicators...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820857/kinematic-and-neuromuscular-measures-of-intensity-during-plyometric-jumps
#3
David Cristóbal Andrade, Oscar Manzo, Ana Rosa Beltrán, Cristian Álvarez, Rodrigo Del Rio, Camilo Toledo, Jason Moran, Rodrigo Ramirez-Campillo
The aim of this study was to assess jumping performance and neuromuscular activity in lower limb muscles after drop jumps (DJ) from different drop heights (intensity) and during continuous jumping (fatigue), using markers such as reactive strength, jump height, mechanical power and surface electromyography (sEMG). The eccentric (EC) and concentric (CON) sEMG from the medial gastrocnemius (MG), biceps femoris (BF) and rectus (R) muscles were assessed during all tests. In a cross-sectional, randomized study, eleven volleyball players (age 24...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820856/perceived-wellness-associated-with-practice-and-competition-in-ncaa-division-i-football-players
#4
Aaron D Wellman, Sam C Coad, Patrick J Flynn, Ty K Siam, Christopher P McLellan
The present study assessed the influence of movement demands resulting from weekly practice sessions and games, on perceived wellness measurements taken post-game (Sunday) and 48 hours pre-game (Thursday) throughout the in-season period in National Collegiate Athletic Association (NCAA) division I football players. Thirty players were monitored using GPS receivers (Catapult Innovations OptimEye S5, Melbourne, Australia) during 12 games and 24 in-season practices. Movement variables included low-intensity distance, medium-intensity distance, high-intensity distance, sprint distance, total distance, player load, and acceleration and deceleration distance...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820855/resistance-exercise-order-does-not-affect-the-magnitude-and-duration-of-post-exercise-blood-pressure-in-older-women
#5
Crisieli M Tomeleri, João Pedro Nunes, Mariana F Souza, Aline Gerage, Alexandre Marcori, Kessi Cassiane Iarosz, Crivaldo Gomes Cardoso-Júnior, Edilson S Cyrino
The aim of this study was to compare the effects of two resistance exercise order on post-exercise blood pressure (BP) in trained, non-hypertensive older women. Sixteen women (68.3 ± 3.3 years, 63.5 ± 11.6 kg, 157.5 ± 5.1 cm) performed two sessions witheight exercises (3 sets of 8-12 repetitions) in distinct orders (from multi- to single-joint exercises [MS] or from single- to multi-joint exercises [SM]) and a control session, without exercise. Blood pressure and heart rate were obtained pre and post-sessions (60 min)...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820854/a-brief-review-of-handgrip-strength-and-sport-performance
#6
John Cronin, Trent Lawton, Nigel Harris, Andrew Kilding, Daniel Travis McMaster
Tests of handgrip strength (HGS) and handgrip force (HGF) are commonly used across a number of sporting populations. Measures of HGS and HGF have also been utilized by practitioners and researchers to evaluate links with sports performance. This article, firstly evaluates the validity and reliability of various handgrip dynamometers (HGD) and HGF sensors, providing recommendations for procedures to ensure precise and reliable data are collected as part of an athlete testing battery. Secondly, the differences in HGS between elite and sub-elite athletes and the relationships between HGS, HGF, and sports performance are discussed...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28800006/match-demands-of-senior-and-junior-players-during-international-rugby-league
#7
Gary M Dempsey, Neil V Gibson, Dave Sykes, Brad Pryjmachuk, Anthony P Turner
This study aims to quantify and compare the positional game demands of international junior and senior rugby league competition for the first time. Global Positioning System (GPS) and video analysis were used to track 118 elite male rugby league players (57 seniors aged 28.7 ± 4.4 y; 61 juniors aged 17.2 ± .5 y) over 10 international matches (6 senior; 4 junior) characterized as either forwards (n = 67) or backs (n = 51). There were significant increases in the offensive carries (0.18 cf. 0.09 n.min; r = ...
August 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28800005/the-effects-of-british-army-footwear-on-ground-reaction-force-and-temporal-parameters-of-british-army-foot-drill
#8
Alex J Rawcliffe, Scott M Graham, Richard J Simpson, Gavin L Moir, Russell Jj Martindale, Stelios G Psycharakis, Chris Connaboy
High rates of occupational training-related lower-limb musculoskeletal [MSK] overuse injuries are reported for British Army recruits during basic training. Foot-drill is a repetitive impact loading occupational activity and involves striking the ground violently with an extended-knee [straight-leg] landing. Foot-drill produces vertical ground reaction forces [vGRF] equal to and/or greater than those reported for high-level plyometric exercises/activities. Shock absorbing footwear aid in the attenuation of the magnitude of vGRF, resulting in a reduced risk of lower-limb MSK overuse injury when running...
August 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28800004/sport-specific-repeated-sprint-training-improves-punching-ability-and-upper-body-aerobic-power-in-experienced-amateur-boxers
#9
Sigitas Kamandulis, Vidas Bruzas, Pranas Mockus, Alvydas Stasiulis, Audrius Snieckus, Tomas Venckunas
High-intensity interval training improves endurance and performance, but it is unclear whether sprint-type upper-body interval training is similarly effective. This study explored the effects of 4-week sport-specific sprint interval training on punch characteristics and endurance capacity in boxers. Experienced male amateur boxers (n = 18) participated in this 4-week training study, and were divided into an experimental group (EG) and a control group (CG) (n = 9 per group). Both groups completed standard low-intensity training...
August 9, 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
#10
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/28796129/pacing-profiles-and-competitive-performance-of-elite-female-400-m-freestyle-swimmers
#11
Patrycja Lipinska, Will G Hopkins
Pacing can impact competitive endurance performance. The objective of this study was to determine relationships between pacing parameters and competitive performance of elite female 400-m freestyle swimmers. Publicly available websites provided 50-m split and final times for 381 swims of 20 elite female swimmers in over 150 national and international competitions between 2004 and 2016. Most pacing profiles displayed negative quadratic curvature, with the fifth of the eight laps being the median slowest. The mean times for the first and last laps were faster than predicted by the quadratic by 5...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796128/high-intensity-interval-exercises-acute-impact-on-heart-rate-variability-comparison-between-whole-body-and-cycle-ergometer-protocols
#12
Gustavo Z Schaun, Fabrício B Del Vecchio
Study aimed to compare the effects of two high-intensity interval exercises (HIIT) protocols on heart rate variability (HRV). Twelve young adult males (23.3 ± 3.9 years, 177.8 ± 7.4 cm, 76.9 ± 12.9 kg) volunteered to participate. In a randomized cross-over design, subjects performed two HIIT protocols, one on a cycle ergometer (TBT; eight 20 s bouts at 170% Pmax interspersed by 10 s rest) and another with whole-body calisthenic exercises (MCR; eight 20 s all-out intervals interspersed by 10 s rest). HRV outcomes in the time, frequency and non-linear domains were assessed on three moments: (a) pre-session; (b) immediately post-session; and (c) 24h post-session...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796127/a-systematic-review-of-the-association-between-physical-fitness-and-musculoskeletal-injury-risk-part-2-muscular-endurance-and-muscular-strength
#13
Sarah J de la Motte, Timothy C Gribbin, Peter Lisman, Kaitlin Murphy, Patricia A Deuster
This is a systematic review and evaluation of the current evidence on the association between muscular endurance (ME) and/or muscular strength (MS) and musculoskeletal injury (MSK-I) risk in military and civilian populations. MEDLINE, EBSCO, EMBASE, and the Defense Technical Information Center were searched for original studies published from 1970 through 2015 that examined associations between physical fitness (ME and MS) and MSK-I in military or civilian populations. Methodological quality and strength of the evidence were determined following criteria adapted from previously published systematic reviews...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796126/physiological-pattern-changes-in-response-to-a-simulated-competition-in-elite-women-artistic-gymnasts
#14
Laurie Isacco, Gaël Ennequin, Johan Cassirame, Nicolas Tordi
The outstanding progress in women's artistic gymnastics in recent decades has led to increased technical and physiological demands. The aim of this study was to investigate i) the physiological demands of elite French gymnasts and ii) the impact of a competitive routine on physiological pattern changes. Fourteen French elite female gymnasts performed anthropometric measurements, physical fitness tests and a simulated four event competition. Heart rate (HR) was continuously recorded throughout the duration of the simulated competition...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796125/electromyographic-and-kinematic-analysis-of-the-flexion-rotation-trunk-test
#15
María P García-Vaquero, Ignacio Ruiz-Pérez, David Barbado, Francisco J Vera-Garcia
While most trunk endurance field protocols are performed in the sagittal or frontal planes, the flexion-rotation trunk (FRT) test combines trunk flexion with rotation, which may be relevant to rotation-related sports. The aim of this study was to describe the trunk and hip muscle activation and fatigue and the range of hip flexion of this test. Twenty-seven physically active males and females performed the FRT test after a period of practice. Electromyographic (EMG) signals were bilaterally collected from the rectus abdominis (RA), internal oblique (IO), and rectus femoris (RF), and hip flexion amplitude was measured using a biaxial electrogoniometer...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796124/evaluation-of-strength-and-conditioning-measures-with-game-success-in-division-i-collegiate-volleyball-a-retrospective-study
#16
Jennifer A Bunn, Greg A Ryan, Gabriel R Button, S Zhang
The purpose of this study was to retrospectively assess relationships between strength and conditioning (SC) measures and game performance in Division I volleyball. Five years of SC and game data were collected from one women's Division I collegiate team, n = 76. SC measures included: T-drill, 18.3 m sprint, back squat, hang clean, vertical jump, and broad jump. All game and SC stats were normalized to Z-scores. Analyses included assessing SC differences by position, and multiple stepwise regression to assess relationships between game and SC stats...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28777244/the-effect-of-a-sprint-interval-and-resistance-concurrent-exercise-training-program-on-aerobic-capacity-of-inactive-adult-women
#17
Lorena Salom Huffman, Shelby J Foote, Hayden Hyatt, James R McDonald, Danielle D Wadsworth, David D Pascoe
The purpose of this investigation was to examine the effects of high-intensity concurrent exercise training (CET) consisting of sprint intervals (SIT) and resistance exercise (RET) protocols on aerobic capacity in recreationally active, adult females. Fifty-three participants were pair-matched according to preliminary maximal aerobic capacity (VO2max) Bruce protocol assessment into level-grade (SIT0) or 6% incline (SIT6) groups. This 12-week intervention consisted of three CET sessions per week. SIT protocol consisted of 2 (weeks 1-6) then 3 (weeks 7-12) sets of three 40s sprints at specific intensities to evoke responses equivalent to 95% of age-predicted maximal heart rate (HR) interspersed with 20s of rest; with 1-minute of passive recovery between sets...
August 2, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28777251/assessment-of-loaded-squat-jump-height-with-a-free-weight-barbell-and-smith-machine-comparison-of-the-take-off-velocity-and-flight-time-procedures
#18
Alejandro Pérez-Castilla, John J McMahon, Paul Comfort, Amador García-Ramos
The aims of this study were to compare the reliability and magnitude of jump height between the two standard procedures of analysing force platform data to estimate jump height (take-off velocity [TOV] and flight time [FT]) in the loaded squat jump (SJ) exercise performed with a free-weight barbell and in a Smith machine. Twenty-three collegiate men (age 23.1 ± 3.2 years, body mass 74.7 ± 7.3 kg, height 177.1 ± 7.0 cm) were tested twice for each SJ type (free-weight barbell and Smith machine) with 17, 30, 45, 60, and 75 kg loads...
July 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28777250/the-effects-of-a-periodized-vs-traditional-military-training-program-on-2-mile-run-performance-during-the-army-physical-fitness-test-apft
#19
Brandon L Stone, Aaron D Heishman, Jay A Campbell
The purpose of this study was to compare the effects of an experimental versus traditional military run training on 2-mile run ability in Army Reserve Officer Training Corps (ROTC) cadets. Fifty college-aged cadets were randomly placed into two groups and trained for four weeks with either an experimental running program (EXP, n=22) comprised of RPE intensity-specific, energy system based intervals or with traditional military running program (TRA, n=28) utilizing a crossover study design. A 2-mile run assessment was performed just prior to the start, at the end of the first 4 weeks, and again after the second 4 weeks of training following crossover...
July 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28777249/isometric-mid-thigh-pull-performance-is-associated-with-athletic-performance-and-sprinting-kinetics-in-division-i-men-and-women-s-basketball-players
#20
Jeremy R Townsend, David Bender, William Vantrease, John Hudy, Kevin Huet, Cassie Williamson, Emily Bechke, Paul Serafini, Gerald T Mangine
PURPOSE: To examine the relationships between isometric mid-thigh pull (IMTP) force, athletic performance measures, and sprint kinetics in Division I men's and women's basketball players. METHODS: Twenty-three (male = 8, female = 15) division 1 basketball players completed a maximal 20-m sprint trial while tethered to a device which provided kinetic feedback (peak and average sprinting power, velocity and force). Additionally, one repetition-maximal (1RM) front squat, 1RM hang clean, vertical jump height, and agility (pro-agility and lane agility) tests were performed...
July 31, 2017: Journal of Strength and Conditioning Research
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