Jumping mechanography: a potential tool for sarcopenia evaluation in older individuals.

Muscular function declines with advancing age and is associated with increased risk for falls and fragility fractures. No single methodology ideally quantitatively evaluates this decline. Jumping mechanography (JM) may prove useful to quantitatively measure muscular function in older adults. This study begins to evaluate the safety of JM and the relationship of jump power and lean mass in older adults. Eighty adults, 40 aged 20-30 yr and 40 aged 60 yr or older, distributed equally by gender, participated. They performed countermovement jumps to assess jump power and height. Self-reported pain before and after jumping and need for assistance was recorded. In the older group, dual-energy X-ray absorptiometry was used to measure bone mineral density, to estimate lean body mass, and to determine vertebral fracture status. Jumping was well tolerated without injury or increased pain. No new vertebral fractures occurred with jumping in the older group. Young individuals had greater jump power and height compared with the older group. Older age was negatively correlated, whereas lean mass positively correlated with jump power and height. JM appears to be a safe and potentially useful method to assess muscular function in older adults.