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Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training.
J Strength Cond Res. 2019 Aug 23 [Online ahead of print]JS

Abstract

Jenkins, NDM, Miramonti, AA, Hill, EC, Smith, CM, Cochrane-Snyman, KC, Housh, TJ, and Cramer, JT. Mechanomyographic amplitude is sensitive to load-dependent neuromuscular adaptations in response to resistance training. J Strength Cond Res XX(X): 000-000, 2019-We examined the sensitivity of the mechanomyographic amplitude (MMGRMS) and frequency (MMGMPF) vs. torque relationships to load-dependent neuromuscular adaptations in response to 6 weeks of higher- vs. lower-load resistance training. Twenty-five men (age = 22.8 ± 4.6 years) were randomly assigned to either a high- (n = 13) or low-load (n = 12) training group and completed 6 weeks of leg extension resistance training at 80 or 30% 1RM. Before and after 3 and 6 weeks of training, mechanomyography signals were recorded during isometric contractions at target torques equal to 10-100% of the subjects' baseline maximal strength to quantify MMGRMS and MMGMPF vs. torque relationships. MMGRMS decreased from Baseline to weeks 3 and 6 in the high-load, but not low-load group, and was dependent on the muscle and intensity of contraction examined. Consequently, MMGRMS was generally lower in the high- than low-load group at weeks 3 and 6, and these differences were most apparent in the vastus lateralis (VL) and rectus femoris muscles at higher contraction intensities. MMGMPF was greater in the high- than low-load training group independent of time or muscle. The MMGRMS vs. torque relationship was sensitive to load-dependent, muscle-specific neuromuscular adaptations and suggest reductions in neuromuscular activation to produce the same absolute submaximal torques after training with high, but not low loads.

Authors+Show Affiliations

School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, Oklahoma. Department of Nutritional Sciences, Oklahoma State University, Stillwater, Oklahoma.Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.Department of Kinesiology, California State University, Fresno, Fresno, California.Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31453941

Citation

Jenkins, Nathaniel D M., et al. "Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training." Journal of Strength and Conditioning Research, 2019.
Jenkins NDM, Miramonti AA, Hill EC, et al. Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training. J Strength Cond Res. 2019.
Jenkins, N. D. M., Miramonti, A. A., Hill, E. C., Smith, C. M., Cochrane-Snyman, K. C., Housh, T. J., & Cramer, J. T. (2019). Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training. Journal of Strength and Conditioning Research. https://doi.org/10.1519/JSC.0000000000003276
Jenkins NDM, et al. Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training. J Strength Cond Res. 2019 Aug 23; PubMed PMID: 31453941.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training. AU - Jenkins,Nathaniel D M, AU - Miramonti,Amelia A, AU - Hill,Ethan C, AU - Smith,Cory M, AU - Cochrane-Snyman,Kristen C, AU - Housh,Terry J, AU - Cramer,Joel T, Y1 - 2019/08/23/ PY - 2019/8/28/entrez PY - 2019/8/28/pubmed PY - 2019/8/28/medline JF - Journal of strength and conditioning research JO - J Strength Cond Res N2 - Jenkins, NDM, Miramonti, AA, Hill, EC, Smith, CM, Cochrane-Snyman, KC, Housh, TJ, and Cramer, JT. Mechanomyographic amplitude is sensitive to load-dependent neuromuscular adaptations in response to resistance training. J Strength Cond Res XX(X): 000-000, 2019-We examined the sensitivity of the mechanomyographic amplitude (MMGRMS) and frequency (MMGMPF) vs. torque relationships to load-dependent neuromuscular adaptations in response to 6 weeks of higher- vs. lower-load resistance training. Twenty-five men (age = 22.8 ± 4.6 years) were randomly assigned to either a high- (n = 13) or low-load (n = 12) training group and completed 6 weeks of leg extension resistance training at 80 or 30% 1RM. Before and after 3 and 6 weeks of training, mechanomyography signals were recorded during isometric contractions at target torques equal to 10-100% of the subjects' baseline maximal strength to quantify MMGRMS and MMGMPF vs. torque relationships. MMGRMS decreased from Baseline to weeks 3 and 6 in the high-load, but not low-load group, and was dependent on the muscle and intensity of contraction examined. Consequently, MMGRMS was generally lower in the high- than low-load group at weeks 3 and 6, and these differences were most apparent in the vastus lateralis (VL) and rectus femoris muscles at higher contraction intensities. MMGMPF was greater in the high- than low-load training group independent of time or muscle. The MMGRMS vs. torque relationship was sensitive to load-dependent, muscle-specific neuromuscular adaptations and suggest reductions in neuromuscular activation to produce the same absolute submaximal torques after training with high, but not low loads. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/31453941/Mechanomyographic_Amplitude_Is_Sensitive_to_Load_Dependent_Neuromuscular_Adaptations_in_Response_to_Resistance_Training_ L2 - https://doi.org/10.1519/JSC.0000000000003276 DB - PRIME DP - Unbound Medicine ER -
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