Effect of exercise on the content and composition of phospholipid-fatty acids in rat skeletal muscle
Journal Title: Biology of Sport - Year 2006, Vol 23, Issue 1
Abstract
Phospholipid-fatty acid composition of the plasma membrane determines many of its properties. There are no data on effect of exercise on the fatty acid content and composition of skeletal muscle phospholipid moieties and it was the aim of the present study to investigate this question. The experiments were carried out on male Wistar rats, 280-310 grams of body weight fed ad libitum a commercial pellet diet for rodents. The rats were divided into three groups: 1-control (sedentary), 2 –exercising 30 min, and 3 – exercising till exhaustion. The treadmill was set at +10o incline and was moving with a speed of 1200m/h. The determinations were carried out on the following muscles: the white (WG) and red (RG) section of the gastrocnemius and the soleus (S). The muscles are composed of fast-twitch glycolytic, fast-twitch oxidative-glycolytic and slow-twitch- oxidative fibres. The phospholipid-fatty acids were identified and quantified by means of gas-liquid chromatography. The total content of phospholipid-fatty acids was reduced after each bout of exercise in WG and and remained stable in the other muscles. 30 min exercise reduced the content of stearic and arachidonic acids in WG, and Palmitoleic acid in RG. Exercise till exhaustion reduced the content of palmitic acid in WG, increased the content of myrystic and palmitoleic acid in S and reduced the content of oleic acid in the same muscle. All these changes, although statistically significant, were small. The ratio of the total content of saturated fatty acids to the total content of unsaturated fatty acids was stable both after 30 min and exhaustive exercise. It is concluded that acute exercise produces only minor changes in the content of phospholipid-fatty acids in skeletal muscles. It assures stability of the plasma membrane function.
Authors and Affiliations
A Nawrocki, M Knapp
Keywords
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