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.