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Weightlifting force-time

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https://www.readbyqxmd.com/read/27820725/training-strategies-to-improve-muscle-power-is-olympic-style-weightlifting-relevant
#1
Christian Helland, Eirik Hole, Erik Iversen, Monica Charlotte Olsson, Olivier Seynnes, Paul Andre Solberg, Gøran Paulsen
INTRODUCTION: This efficacy study investigated the effects of (1) Olympic-style weightlifting (OWL), (2) motorized strength and power training (MSPT), and (3) free weight strength and power training (FSPT) on muscle power. METHODS: Thirty-nine young athletes (20±3 yr.; ice hockey, volleyball and badminton) were randomized into the three training groups. All groups participated in 2-3 sessions/week for 8 weeks. The MSPT and FSPT groups trained using squats (two legs and single leg) with high force and high power, while the OWL group trained using clean and snatch exercises...
November 3, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27669195/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#2
Timothy J Suchomel, Jason P Lake, Paul Comfort
The purpose of this study was to compare the load absorption force-time characteristics of weightlifting catching and pulling derivatives. Twelve resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform with 30, 45, 65, and 80% of their one repetition maximum (1RM) HPC. Load absorption phase duration, mean force, and work were calculated from the force-time data. The HHP produced a significantly longer load absorption phase duration compared to the HPC (p < 0...
September 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27400372/force-time-curve-comparison-between-weightlifting-derivatives
#3
Timothy J Suchomel, Christopher J Sole
The force production characteristics of three weightlifting derivatives were examined by comparing the force-time curves of each exercise. Sixteen resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform at several relative loads. Relative peak force (PFRel), relative impulse (IMPRel), peak rate of force development (PRFD), and time normalized force-time curves of each exercise were compared. The JS produced greater PFRel compared to the HPC (p < 0...
August 24, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/25426514/effect-of-various-loads-on-the-force-time-characteristics-of-the-hang-high-pull
#4
Timothy J Suchomel, George K Beckham, Glenn A Wright
The purpose of this study was to investigate the effect of various loads on the force-time characteristics associated with peak power during the hang high pull (HHP). Fourteen athletic men (age: 21.6 ± 1.3 years; height: 179.3 ± 5.6 cm; body mass: 81.5 ± 8.7 kg; 1 repetition maximum [1RM] hang power clean [HPC]: 104.9 ± 15.1 kg) performed sets of the HHP at 30, 45, 65, and 80% of their 1RM HPC. Peak force, peak velocity, peak power, force at peak power, and velocity at peak power were compared between loads...
May 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/18550958/force-time-curve-characteristics-and-hormonal-alterations-during-an-eleven-week-training-period-in-elite-women-weightlifters
#5
G Gregory Haff, Janna R Jackson, Naoki Kawamori, Jon M Carlock, Michael J Hartman, J Lon Kilgore, Robert T Morris, Michael W Ramsey, William A Sands, Michael H Stone
The purpose of this investigation was to study the effects of an 11-week training period performed by female weightlifters. Two weeks before this investigation, baseline measures for total testosterone, cortisol, and testosterone:cortisol ratio were collected. The 11-week training program consisted of the core exercises (i.e., clean, clean and jerk, and snatch) and other supplemental exercises (i.e., clean pull, snatch pull, squat, and front squat). Hormonal, isometric, and dynamic middle thigh pull force-time curve characteristics were assessed biweekly throughout the duration of the investigation, whereas volume load and training intensity were assessed weekly throughout the investigation...
March 2008: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/16937959/peak-force-and-rate-of-force-development-during-isometric-and-dynamic-mid-thigh-clean-pulls-performed-at-various-intensities
#6
Naoki Kawamori, Steven J Rossi, Blake D Justice, Erin E Haff, Emido E Pistilli, Harold S O'Bryant, Michael H Stone, G Gregory Haff
Eight male collegiate weightlifters (age: 21.2 +/- 0.9 years; height: 177.6 +/- 2.3 cm; and body mass: 85.1 +/- 3.3 kg) participated in this study to compare isometric to dynamic force-time dependent variables. Subjects performed the isometric and dynamic mid-thigh clean pulls at 30-120% of their one repetition maximum (1RM) power clean (118.4 +/- 5.5 kg) on a 61 x 121.9-cm AMTI forceplate. Variables such as peak force (PF) and peak rate of force development (PRFD) were calculated and were compared between isometric and dynamic conditions...
August 2006: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/16287343/force-time-curve-characteristics-of-dynamic-and-isometric-muscle-actions-of-elite-women-olympic-weightlifters
#7
G Gregory Haff, Jon M Carlock, Michael J Hartman, J Lon Kilgore, Naoki Kawamori, Janna R Jackson, Robert T Morris, William A Sands, Michael H Stone
Six elite women weightlifters were tested to evaluate force-time curve characteristics and intercorrelations of isometric and dynamic muscle actions. Subjects performed isometric and dynamic mid-thigh clean pulls at 30% of maximal isometric peak force and 100 kg from a standardized position on a 61.0 x 121.9 cm AMTI forceplate. Isometric peak force showed strong correlations to the athletes' competitive snatch, clean and jerk, and combined total (r = 0.93, 0.64, and 0.80 respectively). Isometric rate of force development showed moderate to strong relationships to the athletes' competitive snatch, clean and jerk, and combined total (r = 0...
November 2005: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/2770265/specificity-of-endurance-sprint-and-strength-training-on-physical-performance-capacity-in-young-athletes
#8
COMPARATIVE STUDY
K Häkkinen, A Mero, H Kauhanen
Three prebubescent athlete groups of endurance runners (E; n = 4), sprinters (S; n = 4) and weightlifters (WL; n = 4) and one control group (C; n = 6) as well as one junior but postpubescent weightlifter group (JWL; n = 6) volunteered as subjects in order to investigate specific effects of endurance, sprint and strength training on physical performance capacity during a 1 year follow-up period. The prepubescent E-group had higher (p less than 0.05) VO2 max (66.5 +/- 2.9 ml x kg1 x min-1) already at the beginning of the study than the other three groups...
March 1989: Journal of Sports Medicine and Physical Fitness
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