Physiological tremor reveals how thixotropy adapts skeletal muscle for posture and movement

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Physiological tremor reveals how thixotropy adapts skeletal muscle for posture and movement. / Vernooij, Carlijn; Reynolds, Raymond; Lakie, Martin.

In: Royal Society Open Science, Vol. 3, No. 5, 160065, 01.05.2016.

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@article{40be0b7d516b448e98e4b72342752407,
title = "Physiological tremor reveals how thixotropy adapts skeletal muscle for posture and movement",
abstract = "People and animals can move freely, but they must also be able to stay still. How do skeletal muscles economically produce both movement and posture? Humans are well known to have motor units with relatively homogeneousmechanical properties. Thixotropic muscle properties can provide a solution by providing a temporary stiffening of all skeletal muscles in postural conditions. This stiffening is alleviated almost instantly when muscles start to move. Inthis paper, we probe this behaviour. We monitor both the neural input to a muscle, measured here as extensor muscle electromyography (EMG), and its output, measured as tremor (finger acceleration). Both signals were analysed continuously as the subject made smooth transitions between posture andmovement. The results showed that there were marked changes in tremor which systematically increased in size and decreased in frequency as the subject moved faster. By contrast, the EMG changed little and reflected muscle force requirement rather than movement speed. The altered tremor reflects naturally occurring thixotropic changes in muscle behaviour. Our resultssuggest that physiological tremor provides useful and hitherto unrecognized insights into skeletal muscle{\textquoteright}s role in posture and movement.",
keywords = "physiological tremor, mechanical resonance, thixotropy, posture, electromyography, muscle",
author = "Carlijn Vernooij and Raymond Reynolds and Martin Lakie",
year = "2016",
month = may,
day = "1",
doi = "10.1098/rsos.160065",
language = "English",
volume = "3",
journal = "Royal Society Open Science",
issn = "2054-5703",
publisher = "The Royal Society",
number = "5",

}

RIS

TY - JOUR

T1 - Physiological tremor reveals how thixotropy adapts skeletal muscle for posture and movement

AU - Vernooij, Carlijn

AU - Reynolds, Raymond

AU - Lakie, Martin

PY - 2016/5/1

Y1 - 2016/5/1

N2 - People and animals can move freely, but they must also be able to stay still. How do skeletal muscles economically produce both movement and posture? Humans are well known to have motor units with relatively homogeneousmechanical properties. Thixotropic muscle properties can provide a solution by providing a temporary stiffening of all skeletal muscles in postural conditions. This stiffening is alleviated almost instantly when muscles start to move. Inthis paper, we probe this behaviour. We monitor both the neural input to a muscle, measured here as extensor muscle electromyography (EMG), and its output, measured as tremor (finger acceleration). Both signals were analysed continuously as the subject made smooth transitions between posture andmovement. The results showed that there were marked changes in tremor which systematically increased in size and decreased in frequency as the subject moved faster. By contrast, the EMG changed little and reflected muscle force requirement rather than movement speed. The altered tremor reflects naturally occurring thixotropic changes in muscle behaviour. Our resultssuggest that physiological tremor provides useful and hitherto unrecognized insights into skeletal muscle’s role in posture and movement.

AB - People and animals can move freely, but they must also be able to stay still. How do skeletal muscles economically produce both movement and posture? Humans are well known to have motor units with relatively homogeneousmechanical properties. Thixotropic muscle properties can provide a solution by providing a temporary stiffening of all skeletal muscles in postural conditions. This stiffening is alleviated almost instantly when muscles start to move. Inthis paper, we probe this behaviour. We monitor both the neural input to a muscle, measured here as extensor muscle electromyography (EMG), and its output, measured as tremor (finger acceleration). Both signals were analysed continuously as the subject made smooth transitions between posture andmovement. The results showed that there were marked changes in tremor which systematically increased in size and decreased in frequency as the subject moved faster. By contrast, the EMG changed little and reflected muscle force requirement rather than movement speed. The altered tremor reflects naturally occurring thixotropic changes in muscle behaviour. Our resultssuggest that physiological tremor provides useful and hitherto unrecognized insights into skeletal muscle’s role in posture and movement.

KW - physiological tremor

KW - mechanical resonance

KW - thixotropy

KW - posture

KW - electromyography

KW - muscle

U2 - 10.1098/rsos.160065

DO - 10.1098/rsos.160065

M3 - Article

VL - 3

JO - Royal Society Open Science

JF - Royal Society Open Science

SN - 2054-5703

IS - 5

M1 - 160065

ER -