acute effects of plyometric exercises performed on land and in water on the parameters of bone metabolism in middle-aged males

Objectives: this study was performed to investigate the acute effect of plyometric exercise in water and on land on some indices of bone metabolism in middle-aged males. methods: in this quasi-experimental study, 10 middle-aged disabled people were selected. participants exercised on two separate weeks, on one week only recorded water-based exercise and the other week reported their land-based plyometric exercise. the blood sample was initially taken 10 minutes before starting plyometric workout on land or in water and 10 minutes after a week of interven- tion. serum levels of alkaline phosphatase (alp) and calcium were measured. student’s t-test was used and p < 0.05 was considered as significant. results: there was no significant difference in mean serum calcium level both before (p = 0.322) and after exercise (p = 1.0) between the 2 groups. mean serum calcium level changes were also similar between the 2 groups (p = 0.300). serum alkaline phosphatase (alp) level was similar between the 2 groups both before (p = 0.337) and after exercise (p = 0.147); yet its changes was significantly higher in individuals, who exercised on land than in water (p = 0.003). conclusions: it seems that land-based plyometric exercise increases serum alp more than water-based plyometric exercise in middle-aged males.