Metabolic Efficiency of Exercise in Relation to Work Load at Constant Speed

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Abstract
O2 consumptions were detd. with a closed circuit metabolism apparatus during the work and recovery periods of 9 subjects exercising 6 min. on a bicycle ergometer at a constant speed of 60 rpm. The net efficiencies fell from a mean of 21.2% at a work load of 690 kg.-m./min. to 19.3% at 920 kg.-m./min. [long dash]a statistically significant decrease. The recovery data fitted a 2-component exponential curve y = a1e-k1t + a2e-k2t , the O2 intake "y" at any time "t" being equal to the sum of the 2 components. It was observed that the slower "lactic" component a2/k2 increased a relatively greater amt. than the "alactic" component a1/k1 at the higher work load, suggesting that this might account for the decreased efficiency.
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