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.
N1 - Funding Information:
This study was not supported by any external funding sources. However, the corresponding author (N.D.M.J.) is currently supported by funding from the National Strength and Conditioning Association Foundation, the American Heart Association, and the Center for Integrative Research on Childhood Adversity COBRE Under Award Number P20GM109097 from the National Institute of General Medical Sciences of the National Institutes of Health.
Publisher Copyright:
© 2021 NSCA National Strength and Conditioning Association. All rights reserved.
PY - 2021/11/1
Y1 - 2021/11/1
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 35(11): 3265-3269, 2021-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 MMGRMSand MMGMPFvs.Torque relationships. MMGRMSdecreased 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, MMGRMSwas 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. MMGMPFwas greater in the high-than low-load training group independent of time or muscle. The MMGRMSvs.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.
AB - 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 35(11): 3265-3269, 2021-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 MMGRMSand MMGMPFvs.Torque relationships. MMGRMSdecreased 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, MMGRMSwas 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. MMGMPFwas greater in the high-than low-load training group independent of time or muscle. The MMGRMSvs.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.
KW - mechanomyography
KW - motor unit behavior
KW - resistance exercise
KW - skeletal muscle
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U2 - 10.1519/JSC.0000000000003276
DO - 10.1519/JSC.0000000000003276
M3 - Article
C2 - 31453941
AN - SCOPUS:85126072854
SN - 1064-8011
VL - 35
SP - 3265
EP - 3269
JO - Journal of strength and conditioning research
JF - Journal of strength and conditioning research
IS - 11
ER -