An integrative view of limitations to muscular performance

First we describe the changing site of limitation to maximal O2 transport with increasing fitness in mammals. The capacity for diffusion and airway/parenchymal flow rate and volume are markedly overbuilt in the sedentary subject's lung, but undergo little change with increased training/fitness;...

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Bibliographic Details
Published in:	Advances in experimental medicine and biology Vol. 384; p. 393
Main Authors:	Dempsey, J A, Babcock, M A
Format:	Journal Article
Language:	English
Published:	United States 1995
Subjects:	Exercise - physiology Humans Muscle Contraction - physiology Muscle Fatigue - physiology Muscles - metabolism Oxygen - metabolism
ISSN:	0065-2598
Online Access:	Get more information
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Summary:	First we describe the changing site of limitation to maximal O2 transport with increasing fitness in mammals. The capacity for diffusion and airway/parenchymal flow rate and volume are markedly overbuilt in the sedentary subject's lung, but undergo little change with increased training/fitness; accordingly, as demand for O2 transport increases in the highly fit, the limits for maximal diffusion and ventilation are surpassed or met at maximal exercise. Secondly, low-frequency diaphragmatic fatigue occurred with by heavy endurance exercise. This fatigue resulted from increased diaphragmatic work together with the major contribution from the secondary effects of increased locomotor muscle activity; namely, metabolic acidosis and increased requirement for blood flow.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 ObjectType-Review-3 content type line 23
ISSN:	0065-2598
DOI:	10.1007/978-1-4899-1016-5_31