Skeletal muscle capillarization and oxidative metabolism in healthy smokers

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Abstract:

We investigated whether the lower fatigue resistance in smokers than in nonsmokers is caused by a compromised muscle oxidative metabolism. Using calibrated histochemistry, we found no differences in succinate dehydrogenase (SDH) activity, myoglobin concentration, or capillarization in sections of the vastus lateralis muscle between smokers and nonsmokers. The relationship between fatigue resistance and SDH activity in nonsmokers (r = 0.93; p = 0.02) is absent in smokers. This indicates that the lower muscle fatigue resistance of smokers can likely be attributed to causes other than differences in oxidative metabolism and capillarization.

Nous testons l’hypothèse selon laquelle la résistance moins grande des fumeurs à la fatigue est due à un compromis au niveau des substrats oxydés dans le métabolisme des muscles. Au moyen d’une technique histochimique étalonnée, nous n’observons aucune différence d’activité de la succinate déshydrogénase (SDH), de la concentration de myoglobine et de la capillarisation dans le muscle vaste externe des fumeurs et des non-fumeurs. La relation chez les non-fumeurs entre la résistance à la fatigue et l’activité de la SDH (r = 0,93; p = 0,02) n’est pas observée chez les fumeurs. La résistance moins grande à la fatigue des fumeurs est vraisemblablement due à d’autres causes que des différences de métabolisme oxydatif et de capillarisation.

Document Type: Research Article

Publication date: December 1, 2008

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  • This bimonthly journal has a 30-year history of publishing, first as the Canadian Journal of Sport Sciences, and later as the Canadian Journal of Applied Physiology. It publishes original research articles, reviews, and commentaries, focussing on the application of physiology, nutrition, and metabolism to the study of human health, physical activity, and fitness. The published research, reviews, and symposia will be of interest to exercise physiologists, physical fitness and exercise rehabilitation specialists, public health and health care professionals, as well as basic and applied physiologists, nutritionists, and biochemists.
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