No sex differences in fatigability or neuromuscular responses during one set of maximal intended velocity muscle actions to failure at 30 % one-repetition maximum.

Tyler J Neltner, Robert W Smith, Jocelyn E Arnett, Dolores G Ortega, Richard J Schmidt, Dona McCanlies, Terry J Housh

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Article in Current research in physiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Tyler J NeltnerDepartment of Health and Human Performance, University of Wisconsin - Platteville, Platteville, WI, 53818, USA.

Robert W SmithDepartment of Health, Human Performance, and Sport, Wayne State College, Wayne, NE, 68510, USA.

Jocelyn E ArnettDepartment of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, 68510, USA.

Dolores G OrtegaDepartment of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, 68510, USA.

Richard J SchmidtDepartment of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, 68510, USA.

Dona McCanliesCollege of Dentistry, University of Nebraska Medical Center, Lincoln, NE, 68510, USA.

Terry J HoushDepartment of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, 68510, USA.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Traditionally, research using dynamic constant external resistance (DCER) training has focused on self-selected velocities. This study aimed to examine sex differences in fatigability and neuromuscular responses during maximal intended velocity, DCER forearm flexion muscle actions to failure. Fourteen men (mean ± SD; age: 22.9 ± 2.0 yrs) and 13 women (age: 22.9 ± 2.6 yrs) completed one set of forearm flexion muscle actions to failure performing the concentric phase of the repetition at maximal intended velocity (as fast as possible). Electromyographic (EMG) and mechanomyographic (MMG) signals were recorded from the biceps brachii. The results indicated that men were significantly stronger and more powerful than women, however, there were no sex differences in the number of repetitions to failure (70 ± 18) or reductions in peak force (31 ± 8 %), peak velocity (57 ± 18 %), or peak power (64 ± 17 %). Additionally, there were no sex differences in the neuromuscular responses, which included increases in EMG amplitude (AMP), decreases in EMG mean power frequency (MPF), and no changes in MMG AMP or MPF. The increase in EMG AMP and decrease in EMG MPF, combined with no changes in MMG AMP or MPF, suggested that the decreases in performance were due to excitation contraction coupling failure, rather than a reduction in central drive. Thus, despite the low relative load, the maximal intended velocity muscle actions resulted in similar impairments of contractile function for the men and women that diminished sex differences in fatigability.

Indexed as

Dynamic constant external resistanceForearm flexionMenWomen

Identifiers

PMID40495856

DOI10.1016/j.crphys.2025.100149

PMCPMC12151235

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.