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운동생리학 : 장시간의 운동이 노화에 따른 쥐 근육 내 pro- 및 macro-glycogen 동운에 미치는 영향
어수주(SuJuEo),이종삼(JongSamLee),조인호(InHoCho),표재환(JaeHwanPyo),박수연(SooYeonPark),김효식(HyoSikKim),이장규(JangKyuLee),김창근(ChangKeunKim) 한국체육학회 2005 한국체육학회지 Vol.44 No.5
The purpose of this study was to examine that the effect of one single bout of prolonged exercise on pro- and macro-glycogen mobilization in aging rat skeletal muscle. Forty eight rats were used and divided into three groups by age; 0 week (n=16), 16 weeks (n=16), 32 weeks (n=16). Each experimental group was further divided into two subgroups; either control (n=8) or exercise (n=8). All animals in exercise groups performed one bout of 3hr swimming exercise (30min × 6bouts). One week before the animals were sacrificed, oral glucose tolerance test (OGTT; 2 grams of glucoseㆍkg<sup>-1</sup> of body mass) was undertaken. At pre-determined time points, the animals were anesthetized by inhalation of ether, and red vastus lateralis muscle was rapidly dissected out and used for total glycogen content as well as pro- and macro-glycogen content measurement. Body mass was significantly heavier in 16wk (302.0±11.1 g) and 32wk (325.7±10.1 g) compared to 0wk (117.8±0.9g), but it was not statistically different between 16wk and 32wk. Three hours of swimming exercise significantly lowered plasma glucose concentration in all experimental groups (p<.001). Resting insulin concentration was only significantly different between 0wk and 32wk (not 16 wk). In aspects of serum insulin concentration, it was the highest in 32wk, and was the lowest in 0wk after 3hr swim exercise. Although resting total glycogen concentration was not significantly different among experimental groups, proglycogen concentration was significantly increased and macroglycogen concentration was significantly decreased in aged muscle. Although 3hr of swim exercise significantly lowered muscle PG content, MG level was not significantly altered. In summary, as aging process continued, PG concentration was increased and the degree of mobilization was continuously increased. This implies that PG may play a major role for energy production during prolonged exercise in aged rat skeletal muscles.