ArticleJournal of applied physiology (Bethesda, Md. : 1985)2026
Motor unit discharge properties of the vastii muscles and their modulation with contraction level depend on the knee-joint angle.
Article in Journal of applied physiology (Bethesda, Md. : 1985), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Age-related differences in motor unit discharge rate modulation across contraction levels.GeroScience · 2026Article
- Reduced knee extensor torque steadiness and increased motor unit discharge rate variability in young people with patellofemoral pain: a pilot study.European journal of applied physiology · 2026Article
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Authors and funding
6 authors.
Funding
Abstract
This study examined the effect of the knee-joint angle on motor unit (MU) discharge properties of the vastii muscles and their modulation with contraction level. Twelve young adults performed unilateral isometric knee-extension contractions during three experimental sessions at either 25°, 55°, and 85° of knee flexion (full extension: 0°) in a randomized order. Each session involved maximal voluntary contractions (MVCs) followed by submaximal trapezoidal and triangular contractions at different levels relative to maximal voluntary torque (MVT). High-density surface electromyograms were recorded from vastus lateralis and medialis muscles and, subsequently, decomposed to obtain discharge timings of individual MUs. MVT was the greatest, whereas MU discharge rate (DR) during MVCs and submaximal contraction levels (≥30% MVT) was the lowest at the intermediate joint angle (55°). The highest DR during MVCs and high-level contractions (70% MVT), however, was at the most flexed knee position (85°), which was due to a greater DR increase 50%-70% MVT compared with 25° and 55°. The onset-offset DR hysteresis (Δ
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