Isokinetic dynamometry is commonly used to assess speed-specific strength and power. In addition, functional tests are often employed to evaluate the level of independence of older individuals. PURPOSE: To examine correlations between isokinetic knee extension and ankle plantar flexion data and functional tests of the lower body in a frail elderly population. METHODS: Isokinetic peak torque (PT) and average power (AP) were evaluated during knee extension and ankle plantar flexion at 1.04, 3.14, and 5.20rad/s. The order of the testing speeds was randomized to reduce the impact of testing order on the results. Functional tests included a modified Margaria-Kalamen test involving a ramp, a gallon jug test, and a 30-second chair stand test. Thirty-six subjects (age = 86.1 +/− 6.6yrs), who were currently residents of an assisted living facility, participated. Testing was performed on separate days to reduce the potential impact of fatigue on the results. In addition, subjects were encouraged to inform testers if they felt any fatigue prior to any testing which might affect their performance. RESULTS: Pearson correlation bivariate analyses demonstrated a correlation between the modified Margaria-Kalamen ramp test and AP during knee extension at 1.04rad/s (r = .434, p = 0.05) and 3.14rad/s, (r = .354, p = 0.05). Peak torque during knee extension at 1.04rad/s (r = .363, p = 0.05) also correlated with the Margaria-Kalamen ramp test. During plantar flexion AP at 1.04rad/s (r = .503, p = 0.01), and PT at 1.04 rad/s and 3.14 rad/sec (r = .531, p = 0.01; r = .433, p = 0.01) also correlated with the Margaria-Kalamen ramp test. The gallon jug test correlated with AP (1.04rad/s, r = .384, 3.14rad/s, r = −.401, 5.20rad/s, r = −.420, p < .05) and PT (1.04rad/s, r = −.394, 3.14rad/s, r = −.378, 5.20rad/s, r = −.479, p < .05) during knee extension at all speeds. The gallon jug test was also correlated with AP (r = −.476) and PT (r = −.429) during plantar flexion at 3.14rad/s. No correlations were observed between the 30-second chair stand and any isokinetic data. CONCLUSIONS: The relationship between functional tests and isokinetic tests of the knee and ankle appear strongest when both tests measure the same specific variable, in this case, power. These data suggest that the isokinetic evaluation of other joints or possibly multi-joint isokinetic tests should be explored as better predictors of walking and standing in a frail elderly population.