Timing of muscle activity during reaching while standing: systematic changes with target distance

Gait & Posture
Amy E Tyler, Gregory M Karst

Abstract

We examined the effects of changing target distance from within arm's length (AL) to beyond arm's length on the onsets of electromyographic (EMG) activity of non-focal muscles for a reaching task performed while standing. Two questions were addressed. First, do changes in target distance result in consistent changes in the onsets of non-focal anticipatory muscle activity of the trunk and legs in healthy subjects? Second, do changes in onsets of all non-focal muscles vary in a similar fashion in response to varying target distance? Thirteen young, healthy adults performed rapid, bilateral reaching movements to targets placed at shoulder height at four distances while electromyographic activity was recorded from muscles of the arm, trunk and legs. Ground reaction forces and arm kinematics were also recorded. The onsets of most non-focal muscles occurred prior to the onset of arm movement, and occurred progressively earlier as target distance was increased. An exception to this trend was the onset of the erector spinae muscle, which occurred progressively later as target distance was increased. These data support the notion that reaches to targets beyond arm's length involve anticipatory non-focal muscle activity that acts to tran...Continue Reading

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Citations

Sep 29, 2009·Medical & Biological Engineering & Computing·N Louis, P Gorce
Jan 4, 2006·Journal of Neurologic Physical Therapy : JNPT·Gregory M KarstAmy E Tyler
Jul 17, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Rini VargheseTanvi Bhatt
Jan 10, 2016·Experimental Brain Research·Alexander Stamenkovic, Paul J Stapley
Jul 1, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·A BonnefoyP Gorce
May 24, 2011·Applied Ergonomics·Caroline DamecourJoan Stevenson
Apr 20, 2017·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Kimberly L KontsonEugene F Civillico
Aug 2, 2014·Journal of Neural Engineering·George A TsianosGerald E Loeb
May 22, 2019·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Michelle Graham, John J Socha
Apr 3, 2021·Computer Methods in Biomechanics and Biomedical Engineering·Cinzia AmiciJoel Pollet

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