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The Journal of Sports Medicine and Physical Fitness 2002 Dicembre;42(3):403-8

lingua: Inglese

Substrate utilization during arm and leg exercise relative to the ventilatory threshold in men

Yasuda N., Ruby B. C., Gaskill S. E.

Human Per­for­mance Labor­a­tory The Uni­ver­sity of Mon­tana, Mis­soula, MT, USA


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Back­ground. The pur­pose of ­this ­study was to deter­mine vari­a­tions in sub­strate util­iza­tion in men ­during arm and leg exer­cise at 70 and 90% of ­mode spe­cific ven­til­a­tory ­threshold (Tvent).
­Methods. Ten ­males ­served as sub­jects. ­Limb ­total and ­muscle vol­umes ­were esti­mated in the ­right arm and leg ­with anthro­pom­etry. Ven­til­a­tory equiv­alence, ­excess CO2, and mod­i­fied V-­slope ­methods ­were ­used to deter­mine ­Tvent. Sub­jects per­formed 15 min of exer­cise at 70 and 90%­Tvent arm ­cranking (AC) exer­cise, and 70 and 90%­Tvent leg ­cycling (LC) exer­cise.
­Results. VO2, VE, and HR ­were ­higher ­during LC exer­cise at ­both inten­sities. How­ever, arm and leg RPE ­were not dif­ferent at 70 and 90%­Tvent. ­There ­were no sig­nif­i­cant dif­fer­ences ­between ­modes at 70%­Tvent in rel­a­tive car­bo­hy­drate use (54.5±9.5 and 57.8±8.2% for AC and LC, respec­tively) and rel­a­tive fat oxi­da­tion (45.5±9.5 and 42.2±8.2% for AC and LC, respec­tively). How­ever, at 90%­Tvent, rel­a­tive car­bo­hy­drate oxi­da­tion was sig­nif­i­cantly ­higher ­during AC ­versus LC exer­cise (75.4±10.6 ­versus 68.6±9.0%, p<0.05). ­Energy expen­di­ture (­total kJ·min-1) was sig­nif­i­cantly ­lower ­during AC exer­cise (14.5±2.9 and 18.4±3.4 for the 70 and 90%­Tvent, respec­tively) ­versus LC exer­cise (27.1±3.3 and 34.8±4.1 for the 70 and 90%­Tvent, respec­tively; p<0.05).
Con­clu­sions. ­These ­results indi­cate ­that sub­strate use ­during AC exer­cise is sim­ilar to LC exer­cise at 70%­Tvent. How­ever, as the exer­cise inten­sity ­increases, the ­smaller arm mus­cu­la­ture ­becomes ­more depen­dent on car­bo­hy­drate util­iza­tion com­pared to the ­legs.

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