肌力和耐力性運動對女性不同身體活動程度鈣離子調節激素及骨質密度之影響

Physical activity has been shown to maintain bone mineral density (BMD) through the effects of mechanical loading on bone metabolism. However, the effects of exercise on the calcium-regulating hormones and other metabolic variables are not known. The purpose of this study was to compare the effects of strength and endurance exercise on parathyroid hormone (PTH) and calcitonin (CT) between males of different physical activity. Experimental group consisted of 9 very active males (runners) and the control group consisted of 10 males with no regular exercise within a year. Subjects were asked to perform both strength (eccentric action) and endurance exercises (V02 peak). The PTH and CT were measured before and after exercise. A two-way ANCOVA was used for data analysis. The results were as follow: (1) High physical activity with regular exercise can increase cardiovascular function and muscle strength in female. (2) Physical activity level is the major factor on bone density for female. High level of physical activity plus strength exercise can have additive effect on bone density. Conclusions: Regular high intensity exercise will help increase bone density. Strength exercise can maintain bone density not only through mechanical loading, but also through biochemical changes in PTH and CT which can positively affect bone density.