Journal article
Four weeks of high- versus low-load resistance training to failure on the rate of torque development, electromechanical delay, and contractile twitch properties
Journal of musculoskeletal & neuronal interactions, Vol.16(2), pp.135-144
06/01/2016
PMCID: PMC5114356
PMID: 27282457
Abstract
The purpose of this study was to investigate the effects of 4-weeks of high- versus low-load resistance training to failure on rate of torque development (RTD), electromechanical delay (EMD), and contractile twitch characteristics. Fifteen men (mean +/- SD; age=21.7 +/- 2.4 yrs) were randomly assigned to either a high- (80% 1RM; n=7) or low-load (30% 1RM; n=8) training group and completed elbow flexion resistance training to failure 3 times per week for 4 weeks. The participants were tested at baseline, 2-, and 4-weeks of training. Peak RTD (pRTD(V)) and RTD at 0-30 (RTD30(V)), 0-50 (RTD50(V)), 0-100 (RTD100(V)), and 0-200 (RTD200(V)) ms, integrated EMG amplitude (iEMG) at 0-30, 0-50, and 0-100 ms, and EMD were quantified during maximal voluntary isometric muscle actions. Peak twitch torque, peak RTD, time to peak twitch, 1/2 relaxation time and the peak relaxation rate were quantified during evoked twitches. Four weeks of high-load, but not low-load resistance training, increased RTD200V. There were also increases in iEMG during the first 30 ms of muscle activation for the high-and low-load groups, which may have indirectly indicated increases in early phase motor unit recruitment and/or firing frequency. There were no significant training-induced adaptations in EMD or contractile twitch properties.
Details
- Title: Subtitle
- Four weeks of high- versus low-load resistance training to failure on the rate of torque development, electromechanical delay, and contractile twitch properties
- Creators
- N. D. M. Jenkins - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAT. J. Housh - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAS. L. Buckner - Univ Mississippi, Dept Hlth Exercise Sci & Recreat Management, University, MS 38677 USAH. C. Bergstrom - Univ Kentucky, Dept Kinesiol & Hlth Promot, Lexington, KY 40506 USAC. M. Smith - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAK. C. Cochrane - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAE. C. Hill - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAA. A. Miramonti - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAR. J. Schmidt - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAG. O. Johnson - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USAJ. T. Cramer - Univ Nebraska, Dept Nutr & Hlth Sci, 211 Ruth Leverton Hall, Lincoln, NE 68583 USA
- Resource Type
- Journal article
- Publication Details
- Journal of musculoskeletal & neuronal interactions, Vol.16(2), pp.135-144
- PMID
- 27282457
- PMCID
- PMC5114356
- NLM abbreviation
- J Musculoskelet Neuronal Interact
- ISSN
- 1108-7161
- Publisher
- Jmni
- Number of pages
- 10
- Grant note
- 1000080; NEB-36-078 / Hatch Act (Agency: United States Department of Agriculture, National Institute of Food and Agriculture) University of Nebraska Agricultural Research Division
- Language
- English
- Date published
- 06/01/2016
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984259397802771
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