Muscle fiber type I influences lipid oxidation during low-intensity exercise in moderately active middle-aged men

Scandinavian Journal of Medicine & Science in Sports
J-P TurpeinenY Antero Kesäniemi

Abstract

The simultaneous effects of body composition, cardiorespiratory fitness, physical activity, and muscle fiber characteristics on lipid oxidation at basal state and during exercise were studied in a population-based group (n = 70) of middle-aged men. Body composition, oxygen uptake, and lipid oxidation were determined in a volitional maximal exercise test, physical activity with a questionnaire, muscle fiber characteristics with muscle biopsy, and resting metabolic rate and lipid oxidation at basal state with indirect calorimetry. In regression analysis, type I muscle fibers contributed significantly to lipid oxidation at basal state (r = 0.30, r2 = 0.07, P<0.05) and during low-intensity exercise (r = 0.35, r2 = 0.10, P<0.05). ANOVA revealed 7.7% (P = 0.268) lower lipid oxidation at basal state, 14% (P<0.05) lower lipid oxidation in low-intensity exercise, and 10.5% (P = 0.088) lower lipid oxidation in moderate-intensity exercise in muscle fiber tertile I (type I muscle fiber count 28.8%) compared with muscle fiber tertile III (type I muscle fiber count 71.4%). In conclusion, the muscle fiber distribution contributed significantly to lipid oxidation during low-intensity exercise in moderately active middle-aged men.

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Citations

Mar 29, 2008·Journal of Applied Physiology·Rebekah M SteeleUlf Ekelund
Aug 21, 2012·Scandinavian Journal of Clinical and Laboratory Investigation·Pauliina PistoY Antero Kesäniemi
Oct 12, 2010·Health & Place·Esther Rind, Andy P Jones
Jun 15, 2011·Journal of Bodywork and Movement Therapies·Bhavesh Surendra Mody
Feb 26, 2015·American Journal of Physiology. Heart and Circulatory Physiology·Cynthia ZizolaP Christian Schulze

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