Journals on Biomedical Intervention - BJSTR Journal

Abstract

Literature shows that #force variability increases when force levels increase. However, this constant increase occurs only to a certain point (e.g., at around 50% of maximum voluntary contraction (MVC) and 80% MVC). After this point, the increase of force variability either slows [1,2] or stops [3-5]. The potential underlying mechanism accounting for the changing rate of increase in force variability is discussed in this brief review. It concludes that among several factors, motor-unit recruitment appears to be the most important factor in determining the relationship between force and force variability although both motor unit discharge rate variability and #synchronization have a significant impact on force variability as well. Force variability has been observed across many studies where people attempt to produce a target level of force [1,3-10]. Recently, Christou et al. [1] examined participants performing an #isometric leg extension and found that force variability increased almost linearly as the level of force increased up to 60% MVC. After this point, force variability continued to increase, but at a much slower rate. Similar findings were also reported in a study with an isometric hand-grip tasks [10], and in a study with isometric abduction of the first #dorsal interosseous muscle [2].

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Motor-Unit Recruitment Plays an Important Role in Determining the Relationship Between Muscle Force and Force Variability by Wan X Yao in BJSTR

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