caa a22 4500 469054158 CHVBK 20180323132838.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00602362 doi (NATIONALLICENCE)springer-10.1007/BF00602362 Effects of temperature on electromyogram and muscle function [Elektronische Daten] [Michael Holewijn, Ronald Heus] Summary: The effects of 30 min of cooling (15°C water) and warming (40°C water) on arm muscle function were measured. A reference condition (24°C air) was included. Of nine young male subjects the maximal grip force (F max), the time to reach 66% ofF max (rate of force buildup) and the maximal rhythmic grip frequency were determined, together with surface electromyographic activity (EMG) of a forearm muscle (flexor digitorum superficialis). The results showed that in contrast to warming, cooling resulted in a significant decrease of 20% in the FmaX and a significant 50% decrease in force build-up time and the maximal rhythmic grip frequency. The relationship between the root mean square value (rms) of the EMG and the static grip force did not change due to temperature changes. The median power frequency (MPF) in the power spectrum of the EMG signal decreased by 50% due to cooling but remained unchanged with heating. During a sustained contraction at 15% ofF max (F max depending on the temperature) the increase in the rms value with contraction time was 90% larger in the warm condition and 80016 smaller in the cold condition compared to the increase in the reference condition. The MPF value remained constant during the warm and reference conditions but in the cold it started at a 50% lower value and increased with contraction time. Since the endurance time was not affected in the cold but 60% reduced in the warm, it was concluded that neither the rms nor the MPF reflected unambiguously the temperature related changes in functional performance of muscle strain with an equal relative load. Springer-Verlag, 1992 Skin temperature nationallicence Muscle contraction nationallicence Endurance time nationallicence Fatigue nationallicence Holewijn Michael NLRGC, Netherlands Aerospace Medical Centre, Department of Research and Development, Kampweg 3, P.O. Box 22, NL-3769, ZG Soesterberg, The Netherlands aut Heus Ronald TNO Institute for Perception, Thermophysiology Research Group, P.O. Box 23, NL-3769, ZG Soesterberg, The Netherlands aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/6(1992-11-01), 541-545 0301-5548 65:6<541 1992 65 421 https://doi.org/10.1007/BF00602362 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00602362 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Holewijn Michael NLRGC, Netherlands Aerospace Medical Centre, Department of Research and Development, Kampweg 3, P.O. Box 22, NL-3769, ZG Soesterberg, The Netherlands aut NATIONALLICENCE 700 1- Heus Ronald TNO Institute for Perception, Thermophysiology Research Group, P.O. Box 23, NL-3769, ZG Soesterberg, The Netherlands aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/6(1992-11-01), 541-545 0301-5548 65:6<541 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer