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https://www.readbyqxmd.com/read/28486331/effect-of-body-position-on-force-production-during-the-isometric-mid-thigh-pull
#1
George K Beckham, Kimitake Sato, Satoshi Mizuguchi, G Gregory Haff, Michael H Stone
Various body positions have been used in the scientific literature when performing the isometric mid-thigh pull resulting in divergent results. We evaluated force production in the isometric mid-thigh pull in bent (125° knee and 125° hip angles) and upright (125° knee, 145° hip angle) positions in subjects with (>6 months) and without (< 6 months) substantial experience using weightlifting derivatives. A mixed-design ANOVA was used to evaluate the effect of pull position and weightlifting experience on peak force, force at 50ms, 90ms, 200ms, and 250ms...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28447186/comparison-of-the-recovery-response-from-high-intensity-and-high-volume-resistance-exercise-in-trained-men
#2
Sandro Bartolomei, Eliahu Sadres, David D Church, Eliott Arroyo, Joseph A Gordon Iii, Alyssa N Varanoske, Ran Wang, Kyle S Beyer, Leonardo P Oliveira, Jeffrey R Stout, Jay R Hoffman
PURPOSE: The purpose of this study was to compare the physiological responses of a high-volume (HV; 8 sets of 10 repetitions) versus high-intensity (HI; 8 sets of 3 repetitions) exercise protocol in resistance-trained men. METHODS: Twelve men (24.5 ± 4.2 years; 82.3 ± 8.4 kg; 175.2 ± 5.5 cm) with 6.3 ± 3.4 years of resistance training experience performed each protocol in a counterbalanced, randomized order. Performance [counter movement jump peak power (CMJP), isokinetic (ISOK) and isometric leg extension (MVIC), isometric mid-thigh pull (IMTP), and isometric squat (ISQ)] and muscle morphological [cross-sectional area (CSA) of vastus lateralis] assessments were performed at baseline (BL), 30-min (P-30 min), 24-h (P-24 h), 48-h (P-48 h), and 72-h (P-72 h) post-exercise for each testing session...
April 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28426514/comparison-of-the-hang-high-pull-and-loaded-jump-squat-for-the-development-of-vertical-jump-and-isometric-force-time-characteristics
#3
Dustin J Oranchuk, Tracey L Robinson, Zachary J Switaj, Eric J Drinkwater
Weightlifting movements have high skill demands and require expert coaching. Loaded jumps have a comparably lower skill demand, but may be similarly effective for improving explosive performance. The purpose of this study was to compare vertical jump performance, isometric force, and rate of force development (RFD) following a ten-week intervention employing the hang high-pull (hang-pull) or trap-bar jump squat (jump-squat). Eighteen NCAA Division II swimmers (8 males, 10 females) with at least one year of resistance training experience volunteered to participate...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28415068/validity-and-reliability-of-a-portable-isometric-mid-thigh-clean-pull
#4
Lachlan P James, Llion A Roberts, G Gregory Haff, Vincent G Kelly, Emma M Beckman
James, LP, Roberts, LA, Haff, GG, Kelly, VG, and Beckman, EM. Validity and reliability of a portable isometric mid-thigh clean pull. J Strength Cond Res 31(5): 1378-1386, 2017-This study investigated the test-retest reliability and criterion validity of force-time curve variables collected through a portable isometric mid-thigh clean pull (IMTP) device equipped with a single-axial load cell. Fifteen males with ≥6 months of resistance training experience attended two testing sessions. In each session, participants performed an IMTP in 2 separate conditions in a randomized counterbalanced manner...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301441/predictors-of-linear-and-multidirectional-acceleration-in-elite-soccer-players
#5
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/28166186/between-session-reliability-of-isometric-mid-thigh-pull-kinetics-and-maximal-power-clean-performance-in-male-youth-soccer-players
#6
Thomas Dos'Santos, Christopher Thomas, Paul Comfort, John J McMahon, Paul A Jones, Nick P Oakley, Ashley L Young
The aim of the study was to determine the between-session reliability of isometric mid-thigh pull (IMTP) kinetics and maximal weight lifted during the power clean (PC) in male youth soccer players, and to identify the smallest detectable differences between sessions. Thirteen male youth soccer players (age: 16.7 ± 0.5 years, height: 1.80 ± 0.08 m, mass: 70.5 ± 9.4 kg) performed three IMTP trials, while only ten soccer players performed maximal power cleans. These were performed twice, separated by 48 hours to examine the between-session reliability...
February 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28121198/supercompensation-kinetics-of-physical-qualities-during-a-taper-in-team-sport-athletes
#7
Bruno Marrier, Julien Robineau, Julien Piscione, Mathieu Lacome, Alexis Peeters, Christophe Hausswirth, Jean-Benoît Morin, Yann Le Meur
PURPOSE: Peaking for major competition is considered critical for maximizing team sports performance. However, there is little scientific information available to guide coaches in prescribing efficient tapering strategies for team sports players. The aim of this study was to monitor the changes in physical performance in elite team sports players during a 3-week taper following a pre-season training camp. METHODS: Ten male international rugby sevens players were tested before (Pre) and after (Post) a 4-week pre-season training camp focusing on high-intensity training and strength training with moderate loads, and once each week during a subsequent 3-week taper (T1, T2, T3)...
January 25, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28118309/maturation-related-differences-in-adaptations-to-resistance-training-in-young-male-swimmers
#8
Jason Moran, Gavin R H Sandercock, Rodrigo Ramírez-Campillo, John-James Wooller, Spiros Logothetis, Patrick P J M Schoenmakers, Dave A Parry
This study examined the effects of resistance training on muscular strength and jump performance in young male swimmers. It was hypothesized that adaptations would be of a lower magnitude in less mature (Pre-peak height velocity [PHV]) than in more mature (Post-PHV) subjects. Fourteen Pre- (-1.8 ± 1.0 years) and 8 Post-PHV (1.6 ± 0.5 years) swimmers undertook a 30 minute, twice-weekly resistance training program for 8 weeks. They were compared with matched control groups (Pre-PHV: -2.0 ± 1.1, n=15; Post-PHV: 1...
January 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002178/effect-of-different-onset-thresholds-on-isometric-mid-thigh-pull-force-time-variables
#9
Thomas Dos'Santos, Paul A Jones, Paul Comfort, Christopher Thomas
Various thresholds have been used to identify the onset of contraction during isometric mid-thigh pull (IMTP) however, no agreed onset threshold exists for this assessment. The purpose of this study was to compare relative body weight (BW) and arbitrary onset thresholds to a criterion onset threshold 5 SD of BW for IMTP force-time variables; force at each threshold, peak force (PF), time-specific force values (100, 150 and 200 ms) and rate of force development (RFD) during 0-100 ms, 0-150 ms, 0-200 ms. Academy rugby league players (n = 9, age: 18...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27918677/a-comparison-of-isometric-mid-thigh-pull-strength-vertical-jump-sprint-speed-and-change-of-direction-speed-in-academy-netball-players
#10
Christopher Thomas, Paul Comfort, Paul A Jones, Thomas Dos'Santos
PURPOSE: To investigate (a) the relationships between maximal isometric strength, vertical jump (VJ), sprint speed, and change of direction speed (CODS) in academy netball players, and (b) determine whether players who have high performance in isometric strength testing would demonstrate superior performance in VJ, sprint speed, and CODS measures. METHODS: Twenty-six young female netball players (age = 16.1 ± 1.2 years; height = 173.9 ± 5.7 cm; body mass = 66...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27744584/resistance-training-intensity-and-volume-affect-changes-in-rate-of-force-development-in-resistance-trained-men
#11
RANDOMIZED CONTROLLED TRIAL
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...
December 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27632577/the-neuromuscular-qualities-of-higher-and-lower-level-mixed-martial-arts-competitors
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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-vs-front-squat-resistance-training-program-on-performance-in-adolescent-males-a-randomized-controlled-trial
#19
RANDOMIZED CONTROLLED TRIAL
Bret Contreras, Andrew D Vigotsky, Brad J Schoenfeld, Chris Beardsley, Daniel T McMaster, Jan H T Reyneke, John B Cronin
Contreras, B, Vigotsky, AD, Schoenfeld, BJ, Beardsley, C, McMaster, DT, Reyneke, JHT, and Cronin, JB. Effects of a six-week hip thrust vs. front squat resistance training program on performance in adolescent males: A randomized controlled trial. J Strength Cond Res 31(4): 999-1008, 2017-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...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27191698/comparison-of-olympic-and-hexagonal-barbells-with-midthigh-pull-deadlift-and-countermovement-jump
#20
COMPARATIVE STUDY
Kylie K Malyszek, RoQue A Harmon, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
Malyszek, KK, Harmon, RA, Dunnick, DD, Costa, PB, Coburn, JW, and Brown, LE. Comparison of olympic and hexagonal barbells with midthigh pull, deadlift, and countermovement jump. J Strength Cond Res 31(1): 140-145, 2017-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 midthigh pull (MTP) and deadlift (DL) are 2 popular exercises. Therefore, the purpose of this study was to compare force between an HBar and OBar for a MTP, DL, and countermovement jump (CMJ)...
January 2017: Journal of Strength and Conditioning Research
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