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Physiological and biochemical adaptations to training in Rana pipiens
Abstract/OtherAbstract :
Fifteen Rana pipiens were trained on a treadmill thrice weekly for 6.5 weeks to assess the effects of training on an animal that supports activity primarily through anaerobiosis. Endurance for activity increased 35% in these frogs as a result of training ( P =0.006, Fig. 1). This increased performance was not due to enhanced anaerobiosis. Total lactate produced during exercise did not differ significantly for the trained or untrained animals in either gastrocnemius muscle (2.77±0.21 and 2.82±0.13 mg/g, respectively) or whole body (1.32±0.10 and 1.47±0.06 mg/g, respectively). Glycogen depletion also did not differ between the two groups (Fig. 2c). The primary response to training appeared to involve augmentation of aerobic metabolism, a response similar to that reported for mammals. Gastrocnemius muscles of trained frogs underwent a 38% increase over those of untrained individuals in the maximum activity of citrate synthase (14.5±1.0 and 10.5±0.9 μmoles/(g wet wt·min); P =0.008). This enzyme was also positively correlated with the level of maximum performance for all animals tested ( r =0.61, P <0.01) and with the degree of improvement in the trained animals ( r =0.72, P <0.05). In addition to an increased aerobic capacity, the trained animals demonstrated a greater removal of lactate from the muscle 15 min after fatigue (Fig. 2b)., Peer Reviewed,
Authors :
Cummings, John W.
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Contributors :
Division of Biological Sciences, The University of Michigan, 48109, Ann Arbor, Michigan, USA, Ann Arbor
Publication Detail :
Publisher :  Springer-Verlag     Type :  -     Format :  588668 bytes, 3115 bytes, application/pdf, text/plain    
Date Detail :
2006-09-11, 2006-09-11, 1979/12
Subject :
Life Sciences, Human Physiology, Biochemistry, general, Biomedicine general, Animal Physiology, Zoology, Physiology, Health Sciences
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Languages :  en_US    
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