Journal article
NEUROMUSCULAR ADAPTATIONS AFTER 2 AND 4 WEEKS OF 80% VERSUS 30% 1 REPETITION MAXIMUM RESISTANCE TRAINING TO FAILURE
Journal of strength and conditioning research, Vol.30(8), pp.2174-2185
08/01/2016
DOI: 10.1519/JSC.0000000000001308
PMID: 26848545
Abstract
The purpose of this study was to investigate the hypertrophic, strength, and neuromuscular adaptations to 2 and 4 weeks of resistance training at 80 vs. 30% 1 repetition maximum (1RM) in untrained men. Fifteen untrained men (mean +/- SD; age = 21.7 +/- 2.4 years; weight = 84.7 +/- 23.5 kg) were randomly assigned to either a high-load (n = 7) or low-load (n = 8) resistance training group and completed forearm flexion resistance training to failure 3 times per week for 4 weeks. Forearm flexor muscle thickness (MT) and echo intensity, maximal voluntary isometric (MVIC) and 1RM strength, and the electromyographic, mechanomyographic (MMG), and percent voluntary activation (% VA) responses at 10-100% of MVIC were determined at baseline, 2, and 4 weeks of training. The MT increased from baseline (2.9 +/- 0.1 cm) to week 2 (3.0 +/- 0.1 cm) and to week 4 (3.1 +/- 0.1 cm) for the 80 and 30% 1RM groups. MVIC increased from week 2 (121.5 +/- 19.1 Nm) to week 4 (138.6 +/- 22.1 Nm) and 1RM increased from baseline (16.7 +/- 1.6 kg) to weeks 2 and 4 (19.2 +/- 1.9 and 20.5 +/- 1.8 kg) in the 80% 1RM group only. The MMG amplitude at 80 and 90% MVIC decreased from baseline to week 4, and % VA increased at 20 and 30% MVIC for both groups. Resistance training to failure at 80 vs. 30% 1RM elicited similar muscle hypertrophy, but only 80% 1RM increased muscle strength. However, these disparate strength adaptations were difficult to explain with neuromuscular adaptations because they were subtle and similar for the 80 and 30% 1RM groups.
Details
- Title: Subtitle
- NEUROMUSCULAR ADAPTATIONS AFTER 2 AND 4 WEEKS OF 80% VERSUS 30% 1 REPETITION MAXIMUM RESISTANCE TRAINING TO FAILURE
- Creators
- Nathaniel D. M. Jenkins - University of Nebraska–LincolnTerry J. Housh - University of MississippiSamuel L. Buckner - University of KentuckyHaley C. Bergstrom - University of KentuckyKristen C. Cochrane - University of Nebraska–LincolnEthan C. Hill - University of Nebraska–LincolnCory M. Smith - University of Nebraska–LincolnRichard J. Schmidt - University of Nebraska–LincolnGlen O. Johnson - University of Nebraska–LincolnJoel T. Cramer - Nutrition & Health Sciences
- Resource Type
- Journal article
- Publication Details
- Journal of strength and conditioning research, Vol.30(8), pp.2174-2185
- DOI
- 10.1519/JSC.0000000000001308
- PMID
- 26848545
- NLM abbreviation
- J Strength Cond Res
- ISSN
- 1064-8011
- eISSN
- 1533-4287
- Publisher
- Lippincott Williams & Wilkins
- Number of pages
- 12
- Grant note
- University of Nebraska Agricultural Research Division 1000080; NEB-36-078 / Hatch Act (Agency: US Department of Agriculture, National Institute of Food and Agriculture)
- Language
- English
- Date published
- 08/01/2016
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984259638702771
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