등열량 중쇄지방식이와 유산소성 운동이 노화쥐의 골격근내 미토콘드리아 생합성과 지구성 운동능력에 미치는 영향
The Effect of Isocaloric Medium-Chain Fat Diet and Aerobic Exercise on Mitochondrial Biogenesis and Endurance Exercise Capacity in Aged Rat
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본 연구의 목적은 등열량 중쇄지방식과 지구성 운동이 노화쥐의 미토콘드리아 생합성과 지구성 운동능력, 인슐린 저항성에 미치는 영향을 규명하는 것이다. 50 주령의 male Wistar rat을 대상으로 4주간 중쇄지방식(전체 열량의 10%)과 지구성 운동을 실시하였다. 연구 결과 집단 간 체중의 차이는 나타나지 않았다. 그러나 중쇄지방식이 집단은 유의한 체지방량의 증가를 보였고, 공복 시 혈당과 인슐린 수준이 유의하게 증가함으로 인슐린 저항성이 발생하였다. 또한 중쇄지방식이와 지구성 운동 병행집단의 지구성 운동능력은 일반식과 지구성 운동병행집단에 비해 유의하게 낮게 나타났다. 그러나 골격근내 미토콘드리아 생합성 표지인자들은 중쇄지방식이과 지구성 운동 시 유의하게 증가한 것으로 나타났다. 요약하면 중쇄지방은 미토콘드리아 생합성을 증가시킴에도 불구하고 인슐린 저항성을 발생시키며, 지구성 운동능력을 증가시키지 않은 것으로 나타났다. 따라서 노화쥐에 있어 중쇄지방산의 사용은 신중할 필요가 있다고 생각한다.
Abstract
The purpose of this study was to investigate the effects of isocaloric medium-chain fat diet and aerobic exercise on mitochondrial biogenesis and endurance exercise capacity in aged rat. 50-week-old male Wistar rat were randomly assigned for 4 group (Chow; isocaloric medium-chain fat diet, MF; endurance exercise, Ex; diet/exercise combined group, Mex). After 4 weeks, body weight did not changed between groups, but visceral fat were significantly increased in MF and Mex. Fasting plasma glucose and insulin level also significantly increased in MF and Mex. Endurance exercise capacity was significantly decreased in Mex compared with Ex. In addition, endurance exercise capacity of Mex group was significantly lower than Ex group. However, the skeletal muscle mitochondrial biosynthesis marker was significantly increased in MF, Ex, and Mex. In summary, although the isocaloric medium-chain fat diet increased mitochondrial biogenesis despite generates insulin resistance, endurance exercise capacity does not increase, respectively. Thus, the use of medium-chain fat diet needs more research for old people.
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