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Impact of Fatiguing, Submaximal High- vs. Low-Torque Isometric Exercise on Acute Muscle Swelling, and Echo Intensity in Resistance-Trained Men.
J Strength Cond Res. 2019 Apr; 33(4):1007-1019.JS

Abstract

Muddle, TWD, Magrini, MA, Colquhoun, RJ, Luera, MJ, Tomko, PM, and Jenkins, NDM. Impact of fatiguing, submaximal high- vs. low-torque isometric exercise on acute muscle swelling, and echo intensity in resistance-trained men. J Strength Cond Res 33(4): 1007-1019, 2019-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: mCSAΔ: 3.52 ± 0.52 cm; EIΔ: 4.58 ± 1.65 au) and LT (mCSAΔ: 3.61 ± 0.59 cm; EIΔ: 3.30 ± 1.36 au) exercise. No relationships between mCSAΔ and time to task failure (TTF), normalized MVIC, or the tension-time integral were observed during either HT or LT exercise. During both conditions, EIΔ was related to TTF (HT: r = 0.44; LT: r = 0.66) and normalized MVIC (HT: r = -0.60; LT: r = -0.57). 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.

Authors+Show Affiliations

Applied Neuromuscular Physiology Laboratory, School of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, Oklahoma.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30789573

Citation

Muddle, Tyler W D., et al. "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, no. 4, 2019, pp. 1007-1019.
Muddle TWD, Magrini MA, Colquhoun RJ, et al. Impact of Fatiguing, Submaximal High- vs. Low-Torque Isometric Exercise on Acute Muscle Swelling, and Echo Intensity in Resistance-Trained Men. J Strength Cond Res. 2019;33(4):1007-1019.
Muddle, T. W. D., Magrini, M. A., Colquhoun, R. J., Luera, M. J., Tomko, P. M., & Jenkins, N. D. M. (2019). 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, 33(4), 1007-1019. https://doi.org/10.1519/JSC.0000000000003033
Muddle TWD, et al. Impact of Fatiguing, Submaximal High- Vs. Low-Torque Isometric Exercise On Acute Muscle Swelling, and Echo Intensity in Resistance-Trained Men. J Strength Cond Res. 2019;33(4):1007-1019. PubMed PMID: 30789573.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Impact of Fatiguing, Submaximal High- vs. Low-Torque Isometric Exercise on Acute Muscle Swelling, and Echo Intensity in Resistance-Trained Men. AU - Muddle,Tyler W D, AU - Magrini,Mitchel A, AU - Colquhoun,Ryan J, AU - Luera,Micheal J, AU - Tomko,Patrick M, AU - Jenkins,Nathaniel D M, PY - 2019/2/23/pubmed PY - 2019/5/11/medline PY - 2019/2/22/entrez SP - 1007 EP - 1019 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 33 IS - 4 N2 - Muddle, TWD, Magrini, MA, Colquhoun, RJ, Luera, MJ, Tomko, PM, and Jenkins, NDM. Impact of fatiguing, submaximal high- vs. low-torque isometric exercise on acute muscle swelling, and echo intensity in resistance-trained men. J Strength Cond Res 33(4): 1007-1019, 2019-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: mCSAΔ: 3.52 ± 0.52 cm; EIΔ: 4.58 ± 1.65 au) and LT (mCSAΔ: 3.61 ± 0.59 cm; EIΔ: 3.30 ± 1.36 au) exercise. No relationships between mCSAΔ and time to task failure (TTF), normalized MVIC, or the tension-time integral were observed during either HT or LT exercise. During both conditions, EIΔ was related to TTF (HT: r = 0.44; LT: r = 0.66) and normalized MVIC (HT: r = -0.60; LT: r = -0.57). 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. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/30789573/Impact_of_Fatiguing_Submaximal_High__vs__Low_Torque_Isometric_Exercise_on_Acute_Muscle_Swelling_and_Echo_Intensity_in_Resistance_Trained_Men_ L2 - http://dx.doi.org/10.1519/JSC.0000000000003033 DB - PRIME DP - Unbound Medicine ER -