Premium
Circadian and individual variations in duration of spontaneous activity among ankle muscles of the cat
Author(s) -
Hensbergen Erica,
Kernell Daniel
Publication year - 1998
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/(sici)1097-4598(199803)21:3<345::aid-mus8>3.0.co;2-a
Subject(s) - cats , circadian rhythm , electromyography , ankle , motor activity , hindlimb , medicine , physical medicine and rehabilitation , anatomy
This article concerns the spontaneous motor behavior of cat hindlimb muscles and muscle regions using 24‐h electromyographic (EMG) recordings. Previously, we found marked differences in average daily “duty time” (i.e., the percentage of total sampling time filled with EMG activity) between different muscles, or muscle portions. We have now analyzed systematic differences in duty time between (i) highly active (midday) and relatively inactive (midnight) periods, and (ii) individual cats. Differences between cats seemed to be associated with differences in motor habits. The midnight reduction in activity was particularly striking for muscles with a high midday activity. Quantitative differences in spontaneous activity (duty time), as compared between active and inactive periods of the day or among individual cats, were associated with marked qualitative alterations in the distribution of activity among the sampled muscles, i.e., these quantitative differences could not be described as a simple up‐ or downscaling of general motor activity. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21:345–351.