Acute Effects of Plyometric Exercises Performed on Land and inWater 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, onone week only recorded water-based exercise and the other week reported their land-based plyometric exercise. The blood samplewasinitially taken 10 minutes before starting plyometric workoutonland or in waterand10 minutes after aweekof intervention. 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.