Transfer effects in endurance exercise. Adaptations in trained and untrained muscles
| Autor: | H. Claassen, Hans-Heinrich Hoppeler, K. E. Conley, Peter Gehr, Kai M. Rösler, H. Howald |
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| Rok vydání: | 1985 |
| Předmět: |
Adult
Male Physiology Arm cranking Volume density Leg muscle Oxygen Consumption Endurance training Physiology (medical) Arm muscle Humans Orthopedics and Sports Medicine Lactic Acid Physics Leg Physical Education and Training Muscles Public Health Environmental and Occupational Health VO2 max General Medicine Anatomy Bicycling Capillaries Mitochondria Lactate clearance Crystallography Arm Lactates Physical Endurance Mitochondrial Volume |
| Zdroj: | European journal of applied physiology and occupational physiology. 54(4) |
| ISSN: | 0301-5548 |
| Popis: | The effects of 8 weeks of bicycle endurance training (5 x /week for 30 min) on maximal oxygen uptake capacity ( $$\dot V_{O_{2max} } $$ ) during arm and leg ergometry, and on the ultrastructure of an untrained arm muscle (m. deltoideus), and a trained leg muscle (m. vastus lateralis) were studied. With the training, leg- $$\dot V_{O_{2max} } $$ for bicycling increased by +13%, while the capillary per fiber ratio and the volume density of mitochondria in m. vastus lateralis increased by +15% and +40%, respectively. In contrast, the untrained m. deltoideus showed an unchanged capillary per fiber ratio and a decreased mitochondrial volume density (−17%). Despite this decrease of mitochondrial volume arm- $$\dot V_{O_{2max} } $$ increased by +9%. It seems unlikely that the observed discrepancy can be explained by cardiovascular adaptations, since arm cranking did not fully tax the cardiovascular system (arm- $$\dot V_{O_{2max} } $$ /leg- $$\dot V_{O_{2max} } $$ : 0.74 and 0.71 before and after training, respectively). Thus neither cardiovascular adaptations nor local structural changes in the untrained muscles could explain the increased arm- $$\dot V_{O_{2max} } $$ . However, the enhanced capacity for lactate clearance after endurance training could be sufficient to account for the larger $$\dot V_{O_{2max} } $$ during arm cranking. We propose that an increased net oxidation of lactate might be responsible for the increased arm- $$\dot V_{O_{2max} } $$ found after bicycle endurance training. |
| Databáze: | OpenAIRE |
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