Biomechanical Comparison of Countermovement Jumps Performed on Land and in Water: Age Effects
Abstract
The aquatic environment provides a low-impact alternative to land-based exercise and rehabilitation in older adults. Evaluate the biomechanics of older adults and young adults performing jumping movements on land and in water. Cross-sectional, mixed-factorial experiment; adjustable-depth pool at sports medicine research facility. Fifty-six young adults (age = 22.0 [3.9] y) and 12 healthy older adults (age = 57.3 [4.4] y). Each participant performed 6 maximal effort countermovement jumps: 3 jumps were performed on land, and 3 other jumps were performed with participants immersed in chest-deep water. Using data from the amortization and propulsive phases of jumping, the authors computed the following kinetic and kinematic measures: peak and mean mechanical power, peak force, amortization time and rate, unweighting and propulsive times, and lower-extremity segment kinematics. Mechanical power outputs were greater in younger adults (peak: 7322 [4035] W) versus older adults (peak: 5661.65 [2639.86] W) and for jumps performed in water (peak: 9387 [3981] W) versus on land (peak: 4545.84 [1356.53] W). Peak dorsiflexion velocities were greater for jumps performed in water (66 [34] deg/s) versus on land (4 [7] deg/s). The amortization ra...Continue Reading
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Effects of a short-term aquatic resistance program on strength and body composition in fit young men
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Biomechanics
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