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Muscle fiber type I influences lipid oxidation during low‐intensity exercise in moderately active middle‐aged men
Author(s) -
Turpeinen J.P.,
Leppävuori J.,
Hein O. J.,
Kaila K.,
Salo J.,
Lilja M.,
Kesäniemi Y.A.
Publication year - 2006
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2004.00436.x
Subject(s) - medicine , intensity (physics) , muscle fibre , fiber , physical activity , exercise intensity , endocrinology , physical therapy , physical medicine and rehabilitation , chemistry , skeletal muscle , heart rate , organic chemistry , blood pressure , physics , quantum mechanics
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, r 2 =0.07, P <0.05) and during low‐intensity exercise ( r =0.35, r 2 =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.