Effect of temperature on skeletal muscle energy turnover during dynamic knee-extensor exercise in humans

Journal of Applied Physiology
Richard A FergusonJens Bangsbo

Abstract

The present study examined the effect of elevated temperature on muscle energy turnover during dynamic exercise. Nine male subjects performed 10 min of dynamic knee-extensor exercise at an intensity of 43 W (SD 10) and a frequency of 60 contractions per minute. Exercise was performed under normal (C) and elevated muscle temperature (HT) through passive heating. Thigh oxygen uptake (V(O2)) was determined from measurements of thigh blood flow and femoral arterial-venous differences for oxygen content. Anaerobic energy turnover was estimated from measurements of lactate release as well as muscle lactate accumulation and phosphocreatine utilization based on analysis of muscle biopsies obtained before and after each exercise. At the start of exercise, muscle temperature was 34.5 degrees C (SD 1.7) in C compared with 37.2 degrees C (SD 0.5) during HT (P < 0.05). Thigh V(O2) after 3 min was 0.52 l/min (SD 0.11) in C and 0.63 l/min (SD 0.13) in HT, and at the end of exercise it was 0.60 l/min (SD 0.14) and 0.61 l/min (SD 0.10) in C and HT, respectively (not significant). Total lactate release was the same between the two temperature conditions, as was muscle lactate accumulation and PCr utilization. Total ATP production (aerobic + anae...Continue Reading

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Citations

Apr 24, 2009·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Douglas Stewart Glazier
Feb 11, 2012·European Journal of Applied Physiology·Stephen J BaileyAndrew M Jones
Sep 29, 2011·Pflügers Archiv : European journal of physiology·Stuart R GrayRichard A Ferguson
Jan 12, 2011·The Journal of Physiological Sciences : JPS·Ryo KakigiShizuo Katamoto
Nov 16, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·S KogaM C Hogan
Aug 21, 2008·Journal of Strength and Conditioning Research·Mateus E ManoelTodd A Miller
Jul 31, 2007·European Journal of Applied Physiology·Florentina J HettingaCarl Foster
Nov 10, 2006·Respiratory Physiology & Neurobiology·Daryl P Wilkerson, Andrew M Jones
Dec 29, 2007·Journal of Applied Physiology·Robert H Fitts
May 10, 2011·Medicine and Science in Sports and Exercise·Andrew M JonesDavid C Poole
Apr 17, 2015·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Christopher W Sundberg, Matthew W Bundle
May 3, 2015·American Journal of Physiology. Heart and Circulatory Physiology·Scott T ChiesaJosé González-Alonso
Aug 28, 2020·Frontiers in Cellular Neuroscience·Rochelle A PetersonSimon J H Brookes

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