Longitudinal changes in muscle power compared to muscle strength and mass.
Level 3 - non-randomized controlled study
Longitudinal cohort study evaluating age-related musculoskeletal changes over 6 years
What was done
Researchers measured 6-year longitudinal changes in 318 randomly selected healthy adults aged 20–90 years from Berlin. Grip strength was measured with a hand dynamometer, muscle mass with dual-energy X-ray absorptiometry (DXA), and lower-extremity muscle power with a chair rise test and two-leg jumps (2LJP) on a Leonardo Mechanograph. Longitudinal changes were evaluated with paired t-tests by age group and sex, annual change differences were tested using ANOVA and Dunnett's test, and inter-variable differences were assessed with one-sample t-tests.
What was found
Lower-extremity jump power (2LJP) declined significantly starting in the 20–39-year-old age group for women (-3.70 W/kg; annual change: -0.46 W/kg) and men (-5.97 W/kg; annual change: -0.75 W/kg; both p < 0.001). The oldest age group exhibited the largest annual loss (-0.99 W/kg in women, -0.88 W/kg in men). The decline in 2LJP was significantly different compared to all variables of muscle mass and strength (p < 0.01). Numerical values for DXA muscle mass, grip strength, and the chair rise test were not reported in the abstract.
Why it matters
Dynamic muscle power begins deteriorating decades earlier than static strength or muscle mass, suggesting that power assessments like jump mechanography are critical for the early detection and prevention of sarcopenia.
Limits
The abstract omits numeric data for muscle mass, grip strength, and chair rise tests, preventing direct magnitude comparisons from the abstract alone. Findings from healthy Berlin adults may not generalize to diverse, frail, or clinical populations, and potential loss to follow-up over the 6-year interval is not detailed.
Cited by
- supports Muscle power and movement speed are the earliest physiological functional traits to decline during the aging process.