Effects of body immersion on postural adjustments to voluntary arm movements in humans: role of load receptor input

The Journal of Physiology
Volker Dietz, G Colombo

Abstract

1. The effect of body immersion on postural adjustments was studied in ten healthy subjects. Reaction times, for pushing or pulling a rigid handle, in response to a visual stimulus were measured. In addition EMG recordings were taken from upper arm and lower leg muscles during three levels of body immersion while standing on a platform (immersed to spinal levels: lumbar nerve root 2 (L2); thoracic nerve root 4 (T4); and cervical nerve root 7 (C7)), while floating and while standing or sitting out of water. 2. With increasing levels of body immersion there was a near linear reduction in the amplitude of the gastrocnemius (GM) EMG activity before (200 ms) the onset of a force signal from pulling, but immersion had a significantly weaker effect on the amplitude of the tibialis anterior (TA) EMG during pushing movements. There was no significant difference in the effect of body immersion on biceps femoris (BF) and rectus femoris (RF). Under free-floating conditions postural adjustments did not occur in response to pull or push movements. There were no adaptational changes of EMG adjustments during successive trials at a given immersion level. 3. Under non-immersed conditions reaction times were significantly shorter during sitting ...Continue Reading

Citations

Oct 17, 2009·Experimental Brain Research·Hélène RugetLaurence Mouchnino
Oct 26, 2012·Somatosensory & Motor Research·Andreia S P SousaJoão Manuel R S Tavares
Jan 18, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Maria KnikouAndrew C Smith
Apr 30, 2010·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Maria Knikou
Apr 14, 2016·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Volker Dietz, Miriam Schrafl-Altermatt
Mar 19, 2013·Neuroscience·J NonnekesV Weerdesteyn
Jan 5, 2000·Physiological Reviews·J DuysensH Cruse
Feb 20, 2004·Motor Control·Nicolas TermozFrançois Prince

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