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https://www.readbyqxmd.com/read/27744584/resistance-training-intensity-and-volume-affect-changes-in-rate-of-force-development-in-resistance-trained-men
#1
Gerald T Mangine, Jay R Hoffman, Ran Wang, Adam M Gonzalez, Jeremy R Townsend, Adam J Wells, Adam R Jajtner, Kyle S Beyer, Carleigh H Boone, Amelia A Miramonti, Michael B LaMonica, David H Fukuda, Nicholas A Ratamess, Jeffrey R Stout
PURPOSE: To compare the effects of two different resistance training programs, high intensity (INT) and high volume (VOL), on changes in isometric force (FRC), rate of force development (RFD), and barbell velocity during dynamic strength testing. METHODS: Twenty-nine resistance-trained men were randomly assigned to either the INT (n = 15, 3-5 RM, 3-min rest interval) or VOL (n = 14, 10-12 RM, 1-min rest interval) training group for 8 weeks. All participants completed a 2-week preparatory phase prior to randomization...
October 15, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27632577/the-neuromuscular-qualities-of-higher-and-lower-level-mixed-martial-arts-competitors
#2
Lachlan P James, Emma M Beckman, Vincent G Kelly, G Gregory Haff
PURPOSE: To determine whether the maximal strength, impulse and power characteristics of competitive mixed martial arts (MMA) athletes differ according to competition level. METHODS: Twenty-nine male semi-professional and amateur MMA competitors were stratified into either higher-level (HL) or lower-level (LL) performers on the basis of competition grade and success. The one-repetition maximum (1RM) squat was used to assess lower body dynamic strength, while a spectrum of impulse, power, force and velocity variables were evaluated during an incremental load jump squat...
September 15, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27618735/assessing-muscle-strength-asymmetry-via-a-unilateral-stance-isometric-mid-thigh-pull
#3
Thomas Dos'Santos, Christopher Thomas, Paul A Jones, Paul Comfort
PURPOSE: The purpose of this study was to investigate the within-session reliability of bilateral and unilateral stance isometric mid-thigh pull (IMTP) force-time characteristics including peak force (PF), relative PF and impulse at time bands (0-100, 0-200, 0-250 and 0-300 ms); and to compare isometric force-time characteristics between right and left and dominant (D) and non-dominant (ND) limbs. METHODS: Professional male Rugby league and multi-sport collegiate male athletes (n=54, age 23...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27618527/the-relationship-between-maximal-strength-and-reactive-strength
#4
Kris Beattie, Brian P Carson, Mark Lyons, Ian C Kenny
Maximum- and reactive-strength qualities both have important roles in athletic movements and sporting performance. Very little research has investigated the relationship between maximum-strength and reactive-strength. The aim of this study was to investigate the relationship between maximum-strength (isometric mid-thigh pull peak force; IMTP PF) and reactive-strength (drop-jump reactive-strength index; DJ-RSI) variables at 0.3 m, 0.4 m, 0.5 m and 0.6 m box heights. A secondary aim investigated the between- and within-group differences in reactive-strength characteristics between relatively 'strong' and 'weak' athletes...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27618339/the-effect-of-maximal-explosive-strength-training-on-performance-indicators-in-cyclists
#5
Kris Beattie, Brian P Carson, Mark Lyons, Ian C Kenny
Cycling economy (CE), power at maximal oxygen uptake (WV̇O2max) and anaerobic function (i.e. sprinting ability) are considered to be the best physiological performance indicators in elite road cyclists. In addition to cardiovascular function, these physiological indicators are partly dictated by neuromuscular factors. One technique to improve neuromuscular function in athletes is through strength training. The aim of this study was to investigate the effect of a 20 week maximal- and explosive-strength training intervention on strength (maximal- , explosive-strength & bike-specific explosive-strength), WV̇O2max, CE and body composition (body mass, fat & lean mass) in cyclists...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27601775/temporal-associations-between-individual-changes-in-hormones-training-motivation-and-physical-performance-in-elite-and-non-elite-trained-men
#6
B T Crewther, J Carruthers, L P Kilduff, C E Sanctuary, C J Cook
To advance our understanding of the hormonal contribution to athletic performance, we examined the temporal associations between individual changes in testosterone (T) and/or cortisol (C) concentrations, training motivation and physical performance in elite and non-elite trained men. Two male cohorts classified as elites (n = 12) and non-elites (n = 12) completed five testing sessions over a six-week period. The athletes were tested for salivary T, C, T/C ratio, self-perceived training motivation, countermovement jump (CMJ) height and isometric mid-thigh pull peak force (IMTP PF), after which an actual training workout was performed...
September 2016: Biology of Sport
https://www.readbyqxmd.com/read/27548797/isometric-mid-thigh-pull-reliability-and-relationship-to-deadlift-1rm
#7
John K De Witt, Kirk L English, J Brent Crowell, Kent L Kalogera, Mark E Guilliams, Bruce E Nieschwitz, Andrea M Hanson, Lori L Ploutz-Snyder
PURPOSE: The purpose of this investigation was to examine the reliability of the isometric mid-thigh pull (IMTP) and the relationship between IMTP peak force and deadlift 1 repetition maximum (1RM). METHODS: Nine subjects (5 m/4 f; 40.6 ± 8.0 yr; 1.72 ± 0.10 m; 75.6 ± 13.4 kg) participated in this study. IMTP and deadlift 1RM were both performed during 2 testing sessions. For IMTP, peak force and peak rate of force development (RFD) were determined, in addition to RFD at 30 ms, 50 ms, 90 ms, 150 ms, 200 ms, and 250 ms after initiation of the pull...
August 18, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27465635/effects-of-short-term-free-weight-and-semiblock-periodization-resistance-training-on-metabolic-syndrome
#8
Mark A South, Andrew S Layne, Charles A Stuart, N Travis Triplett, Michael Ramsey, Mary E Howell, William A Sands, Satoshi Mizuguchi, W Guy Hornsby, Ashley A Kavanaugh, Michael H Stone
South, MA, Layne, AS, Stuart, CA, Triplett, NT, Ramsey, MW, Howell, ME, Sands, WA, Mizuguchi, S, Hornsby, WG, Kavanaugh, AA, and Stone, MH. Effects of short-term free-weight and semiblock periodization resistance training on metabolic syndrome. J Strength Cond Res 30(10): 2682-2696, 2016-The effects of short-term resistance training on performance and health variables associated with prolonged sedentary lifestyle and metabolic syndrome (MS) were investigated. Resistance training may alter a number of health-related, physiological, and performance variables...
October 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27253835/effects-of-a-six-week-hip-thrust-versus-front-squat-resistance-training-program-on-performance-in-adolescent-males-a-randomized-controlled-trial
#9
Bret Contreras, Andrew D Vigotsky, Brad J Schoenfeld, Chris Beardsley, Daniel Travis McMaster, Jan Reyneke, John Cronin
The barbell hip thrust may be an effective exercise for increasing horizontal force production and may thereby enhance performance in athletic movements requiring a horizontal force vector, such as horizontal jumping and sprint running. The ergogenic ability of the squat is well known. The purpose of this study was to compare the effects of six-week front squat and hip thrust programs in adolescent male athletes. Vertical jump height, horizontal jump distance, 10 m and 20 m sprint times, and isometric mid-thigh pull peak force were among the measured performance variables, in addition to front squat and hip thrust three-repetition maximum (3 RM) strength...
May 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27191698/comparison-of-olympic-and-hexagonal-barbells-with-mid-thigh-pull-deadlift-and-countermovement-jump
#10
Kylie K Malyszek, RoQue A Harmon, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
Those training for strength and power commonly use different bars and different lifts. The hexagonal barbell (HBar) and Olympic barbell (OBar) are frequently used training implements, and the mid-thigh pull and deadlift are two popular exercises. Therefore, the purpose of this study was to compare force between an HBar and OBar for a mid-thigh pull (MTP), deadlift (DL) and countermovement jump (CMJ). Twenty resistance trained men (age = 24.05 ± 2.09 yrs, ht = 178.07 ± 7.05 cm, mass = 91.42 ± 14.44 kg) volunteered to participate and performed MTP and DL utilizing both bars, and a CMJ...
May 14, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27043303/gender-differences-in-physical-performance-characteristics-of-elite-surfers
#11
Joanna Parsonage, Josh Secomb, Tai Tran, Oliver Farley, Sophia Nimphius, Lina Lundgren, Jeremy M Sheppard
The purpose of this study was to describe and compare the gender differences in physical performance characteristics of elite surfers. Twenty competitive female surfers (CFS) and twenty competitive male surfers (CMS) performed a battery of physical performance tests: squat Jump (SJ), isometric mid-thigh pull (IMTP), 15m-sprint paddle and 400m-endurance paddle) during a single testing session. All performance measures were significantly different between CFS and CMS (p<0.01). Specifically, CMS produced greater peak force production (28...
March 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26982977/isometric-mid-thigh-pull-correlates-with-strength-sprint-and-agility-performance-in-collegiate-rugby-union-players
#12
Ran Wang, Jay R Hoffman, Satoru Tanigawa, Amelia A Miramonti, Michael B La Monica, Kyle S Beyer, David D Church, David H Fukuda, Jeffrey R Stout
Wang, R, Hoffman, JR, Tanigawa, S, Miramonti, AA, La Monica, MB, Beyer, KS, Church, DD, Fukuda, DH, and Stout, JR. Isometric mid-thigh pull correlates with strength, sprint, and agility performance in collegiate rugby union players. J Strength Cond Res 30(11): 3051-3056, 2016-The purpose of this investigation was to examine the relationships between isometric mid-thigh pull (IMTP) force and strength, sprint, and agility performance in collegiate rugby union players. Fifteen members of a champion-level university's club rugby union team (mean ± SD: 20...
November 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26937771/physical-differences-between-forwards-and-backs-in-american-collegiate-rugby-players
#13
Michael B La Monica, David H Fukuda, Amelia A Miramonti, Kyle S Beyer, Mattan W Hoffman, Carleigh H Boone, Satoru Tanigawa, Ran Wang, David D Church, Jeffrey R Stout, Jay R Hoffman
La Monica, MB, Fukuda, DH, Miramonti, AA, Beyer, KS, Hoffman, MW, Boone, CH, Tanigawa, S, Wang, R, Church, DD, Stout, JR, and Hoffman, JR. Physical differences between forwards and backs in American collegiate rugby players. J Strength Cond Res 30(9): 2382-2391, 2016-This study examined the anthropometric and physical performance differences between forwards and backs in a championship-level American male collegiate rugby team. Twenty-five male rugby athletes (mean ± SD; age 20.2 ± 1.6 years) were assessed...
September 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26900896/the-impact-of-chocolate-goat-s-and-cow-s-milk-on-postresistance-exercise-endocrine-responses-and-isometric-mid-thigh-pull-performance
#14
David Bellar, Nina R LeBlanc, Kellie Murphy, Kaitlyn M Moody, Gina Buquet
The present investigation examined the effects of chocolate cow's and goat's milk on endocrine responses and isometric mid-thigh pull performance post back squat exercise. Twelve college-aged males volunteered to participate and reported to the lab on four occasions. The first visit included anthropometric measurement, one-repetition back squat (1RM), and familiarization with the isometric mid-thigh pull assessment (IMTP). During the subsequent three visits, five sets of eight repetitions of the back squat exercise at 80% of 1RM were performed...
2016: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/26881871/physiological-profile-of-a-professional-boxer-preparing-for-title-bout-a-case-study
#15
Israel Halperin, Steven Hughes, Dale W Chapman
This study aimed to (1) profile a professional boxer (23 years and 80 kg) with boxing-specific, muscle function, aerobic capacity and body composition tests, and (2) quantify how these measures varied during an 8-week preparation phase leading to, and post a state-Title Bout fought in the 76.2-kg class. A series of boxing-specific and muscle function tests were completed on 11 occasions: 9 prior and twice after the bout, each separated by approximately 2 weeks. The boxing test included 36 maximal punches (9 of each: lead and rear straights, lead and rear hooks) to a punching integrator measuring forces and velocity...
October 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/26664263/relationships-between-lower-body-muscle-structure-and-lower-body-strength-explosiveness-and-eccentric-leg-stiffness-in-adolescent-athletes
#16
Josh L Secomb, Sophia Nimphius, Oliver R L Farley, Lina E Lundgren, Tai T Tran, Jeremy M Sheppard
The purpose of the present study was to determine whether any relationships were present between lower-body muscle structure and, lower-body strength, variables measured during a countermovement jump (CMJ) and squat jump (SJ), and eccentric leg stiffness, in adolescent athletes. Thirty junior male (n = 23) and female (n = 7) surfing athletes (14.8 ± 1.7 y; 1.63 ± 0.09 m; 54.8 ± 12.1 kg) undertook lower-body muscle structure assessment with ultrasonography and performed a; CMJ, SJ and an isometric mid-thigh pull (IMTP)...
December 2015: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/26582972/the-effect-of-6-days-of-alpha-glycerylphosphorylcholine-on-isometric-strength
#17
RANDOMIZED CONTROLLED TRIAL
David Bellar, Nina R LeBlanc, Brian Campbell
BACKGROUND: Ergogenic aides are widely used by fitness enthusiasts and athletes to increase performance. Alpha glycerylphosphorylcholine (A-GPC) has demonstrated some initial promise in changing explosive performance. The purpose of the present investigation was to determine if 6 days of supplementation with A-GPC would augment isometric force production compared to a placebo. METHODS: Thirteen college-aged males (Means ± SD; Age: 21.9 ± 2.2 years, Height: 180...
2015: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/26561721/lower-body-muscle-structure-and-jump-performance-of-stronger-and-weaker-surfing-athletes
#18
Josh L Secomb, Sophia Nimphius, Oliver R Farley, Lina Lundgren, Tai T Tran, Jeremy M Sheppard
PURPOSE: To identify whether there are any significant differences in the lower-body muscle structure and countermovement-jump (CMJ) and squat-jump (SJ) performance between stronger and weaker surfing athletes. METHODS: Twenty elite male surfers had their lower-body muscle structure assessed with ultrasonography and completed a series of lower-body strength and jump tests including isometric midthigh pull (IMTP), CMJ, and SJ. Athletes were separated into stronger (n = 10) and weaker (n = 10) groups based on IMTP performance...
July 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26217049/effect-of-sampling-frequency-on-isometric-midthigh-pull-kinetics
#19
Thomas Dos'Santos, Paul A Jones, Jonathan Kelly, John J McMahon, Paul Comfort, Christopher Thomas
PURPOSE: Skeletal-muscle function can be evaluated using force-times curves generated via the isometric midthigh pull (IMTP). Various sampling frequencies (500-1000 Hz) have been used for IMTP assessments; however, no research has investigated the influence of sampling frequency on IMTP kinetics. Therefore, the purpose of this study was to investigate the influence of sampling frequency on kinetic variables during the IMTP, including peak force, time-specific force values (100, 150, and 200 ms), and rate of force development (RFD) at 3 time bands (0-100, 0-150, 0-200 ms)...
March 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26064106/cognitive-function-and-salivary-dhea-levels-in-physically-active-elderly-african-american-women
#20
Greggory R Davis, Gabrielle J Gallien, Kaitlyn M Moody, Nina R LeBlanc, Peter R Smoak, David Bellar
Serum and plasma dehydroepiandrosterone sulfate (DHEAS) concentration has been associated with several health parameters associated with aging including cognitive function, bone mineral density, and muscular strength. However, the effectiveness of salivary DHEA for the prediction of cognitive function, bone mineral density, and muscular strength in older adults is currently unknown. Thirty elderly African American females provided early morning salivary samples and DHEA levels were determined using a commercially available immunoassay...
2015: International Journal of Endocrinology
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