THE INFLUENCE OF AIR TEMPERATURE ON THE EMG/FORCE RELATIONSHIP OF THE QUADRICEPS

Authors
  1. Bell, D.G.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Surface electromyography (EMG) in the past has been used to estimate the intensity of muscle contraction. These estimates were derived from the EMG/force relationship measured at room tempeature. How the surface EMG signal is influenced by varying air temperature as it relates to the EMG/force relationship has yet to be investigated. Thus, the study evaluated the influence of different air temperatures (10, 23 and 40 degrees C) on surface EMG during contractions of the quadriceps muscle. Ten subjects (mean (SD) age 29 (7) years and weight 78.3 (7.8) kg) performed a criterion task of five contractions ranging from 10 to 100% of a maximal voluntary contraction, five times over a 1.5-h period in all conditions. The EMG signals generated from the rectus femoris, and the forces associated with the contractions, were captured on FM tape and subsequently digitized at a sampling rate of 2000 Hz. The relationship between EMG and force was different under the different conditions; EMG was reduced at a given force as temperature increased, and the EMG increased in the 10 degrees C environment over time.
Report Number
DCIEM-92-55 — Reprint
Date of publication
11 May 1993
Number of Pages
5
Reprinted from
Eur J Appl Physiol, vol 67, 1993, p 256-260
DSTKIM No
94-00801
CANDIS No
136006
Format(s):
Hardcopy;Originator's fiche received by DSIS

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