Normative Values of Muscle Power using Force Plate Jump Tests in Men Aged 77-101 Years: The Osteoporotic Fractures in Men (MrOS) Study.

ObjectiveTo determine normative values for weight-bearing, countermovement leg extension ("jump") tests in the oldest men and characteristics of those not completing vs. completing tests.Design2014-16 cross-sectional exam.SettingSix U.S. sites from the Osteoporotic Fractures in Men (MrOS) Study.ParticipantsCommunity-dwelling men (N=1,841) aged 84.5±4.2 (range: 77-101) years.InterventionsN/A.MeasurementsJump tests on a force plate measured lower-extremity muscle peak power/kg, velocity and force/kg at peak power, with normative values for 5-year age groups and by limitations in moderate-intensity activities of daily living (ADLs) and climbing several flights of stairs.ResultsJump completion was 68.9% (N=1,268/1,841) and 98% (1,242/1,268) had ≥1 analyzable trial/participant. Exclusions primarily were due to poor mobility and/or balance: 24.8% (456/1,841) prior to and 6.4% (N=117/1,841) after attempting testing. Peak power was 20.8±5.3 W/kg, with 1.2±0.3 m/s for velocity, and 16.7±1.9 N/kg for force at peak power. Each 5-year age group >80 years had subsequently 10% lower power/kg, with 30% lower power/kg at >90 vs. ≤80 years (all p90 vs. ≤80 years (all p80 years. Future research should examine age- and functional-related declines in jump measures related to physical performance decline, falls, fractures, and disability.