Acta physiol. scand. 1979. 105. 163-170 From August Krogh Institute, University of Copenhagen, Denmark
Interrelationships between skeletal muscle adaptations and performance as studied by detraining and retraining BY MICHAEL E. HOUSTON, HENNING BENTZEN and HENRIKLARSEN Received 18 May 1978
Abstract HOUSTON,M. E., H. BENTZEN and H. LARSEN.Interrelationships between skeletal muscle adaptations and performance as studied by detraining and retraining. Acta physiol. scand. 1979. 105. 163-170. The effects of 15 days of detraining and 1 5 days of retraining were studied in 6 well-trained runners. Detraining resulted in significant decreases in the mean activities of succinate dehydrogenase (SDH) and lactate dehydrogenase (LDH) of 24 % and 13 %, respectively, but n o significant increases in these enzyme activities occurred with retraining. Maximal oxygen uptake (VOz max: decreased by 4% with detraining (p < 0.05), and increased by a similar amount with retraining. Performance time in an intense submaximal run decreased by 2 5 % (pi0.05) with inactivity, but still averaged 9 % below the initial level after retraining. Maximal heart rate and peak heart rate during the performance run were higher after detraining by 4 and 9 beats per min, respectively (p < 0.05). With retraining, these heart rate values were decreased by 7 and 9 beats per min (pi0.05). Blood lactate concentrations after the V0 ,max and performance run were approximateIy 20% lower after detraining and retraining (p
Interrelationships between skeletal muscle adaptations and performance as studied by detraining and retraining BY MICHAEL E. HOUSTON, HENNING BENTZEN and HENRIKLARSEN Received 18 May 1978
Abstract HOUSTON,M. E., H. BENTZEN and H. LARSEN.Interrelationships between skeletal muscle adaptations and performance as studied by detraining and retraining. Acta physiol. scand. 1979. 105. 163-170. The effects of 15 days of detraining and 1 5 days of retraining were studied in 6 well-trained runners. Detraining resulted in significant decreases in the mean activities of succinate dehydrogenase (SDH) and lactate dehydrogenase (LDH) of 24 % and 13 %, respectively, but n o significant increases in these enzyme activities occurred with retraining. Maximal oxygen uptake (VOz max: decreased by 4% with detraining (p < 0.05), and increased by a similar amount with retraining. Performance time in an intense submaximal run decreased by 2 5 % (pi0.05) with inactivity, but still averaged 9 % below the initial level after retraining. Maximal heart rate and peak heart rate during the performance run were higher after detraining by 4 and 9 beats per min, respectively (p < 0.05). With retraining, these heart rate values were decreased by 7 and 9 beats per min (pi0.05). Blood lactate concentrations after the V0 ,max and performance run were approximateIy 20% lower after detraining and retraining (p
