Journal article
IMPACT OF FATIGUING, SUBMAXIMAL HIGH- VS. LOW-TORQUE ISOMETRIC EXERCISE ON ACUTE MUSCLE SWELLING, AND ECHO INTENSITY IN RESISTANCE-TRAINED MEN
Journal of strength and conditioning research, Vol.33(4), pp.1007-1019
04/01/2019
DOI: 10.1519/JSC.0000000000003033
PMID: 30789573
Abstract
To evaluate the effects of repeated, fatiguing isometric knee extension contractions performed at high-torque (HT) vs. low-torque (LT) maximal voluntary isometric contraction (MVIC) on acute muscle swelling, and echo intensity (EI) of the rectus femoris (RF) and vastus lateralis (VL) muscles in resistance-trained males. Twenty-two resistance-trained men performed either HT (70% MVIC) or LT (30% MVIC) isometric contractions to fatigue on separate days. Before and after exercise, muscle cross-sectional area (mCSA) and EI of the RF and VL were assessed through ultrasound. Muscle cross-sectional area and EI (collapsed across muscle) increased similarly after HT (mean +/- 95% confidence interval: mCSA Delta: 3.52 +/- 0.52 cm(2); EI Delta: 4.58 +/- 1.65 au) and LT (mCSA Delta: 3.61 +/- 0.59 cm(2); EI Delta: 3.30 +/- 1.36 au) exercise. No relationships between mCSA Delta and time to task failure (TTF), normalized MVIC, or the tension-time integral were observed during either HT or LT exercise. During both conditions, EI Delta was related to TTF (HT: r = 0.44; LT: r = 0.66) and normalized MVIC (HT: r = 20.60; LT: r = 20.57). These results suggest that acute muscle swelling and increased EI observed in response to intermittent, submaximal, fatiguing isometric exercise are similar for the RF and VL and are not dependent on the torque-level or tension-time integral when exercise is performed to failure. Factors such as the duration of time performing exercise and relative muscle strength may influence the magnitude of change in EI, but not acute muscle swelling, during intermittent fatiguing isometric exercise.
Details
- Title: Subtitle
- IMPACT OF FATIGUING, SUBMAXIMAL HIGH- VS. LOW-TORQUE ISOMETRIC EXERCISE ON ACUTE MUSCLE SWELLING, AND ECHO INTENSITY IN RESISTANCE-TRAINED MEN
- Creators
- Tyler W. D. Muddle - Oklahoma State UniversityMitchel A. Magrini - Oklahoma State UniversityRyan J. Colquhoun - Oklahoma State UniversityMicheal J. Luera - Oklahoma State UniversityPatrick M. Tomko - Oklahoma State UniversityNathaniel D. M. Jenkins - Oklahoma State University
- Resource Type
- Journal article
- Publication Details
- Journal of strength and conditioning research, Vol.33(4), pp.1007-1019
- DOI
- 10.1519/JSC.0000000000003033
- PMID
- 30789573
- NLM abbreviation
- J Strength Cond Res
- ISSN
- 1064-8011
- eISSN
- 1533-4287
- Publisher
- Lippincott Williams & Wilkins
- Number of pages
- 13
- Language
- English
- Date published
- 04/01/2019
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984259644502771
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