The influence of lower extremity joint torque on gait characteristics in elderly men

Objective: To examine the relation between certain lower extremity isokinet ic muscle torque capabilities and selected stride characteristics for a gro up of elderly, sedentary men. Study Design: Descriptive analysis of convenience sample. Setting: Veterans Administration (VA) ambulatory care center. Subjects: Eighty-one elderly men, capable of independent ambulation, were r ecruited from outpatient clinics and the local community (mean age, 74.7yr) . Main Outcome Measures: Maximal isokinetic torque in the sagittal plane of h ip, knee, and ankle muscles; stride characteristics of speed, stride length , and cadence recorded during walking at a self-selected velocity. Results: Stepwise regression analysis revealed that hip extension torque wa s the only significant independent predictor for free walking speed, stride length, and cadence, and accounted for 37% (r = .611), 35% (r = .590), and 12% (r = .341) of the total variance, respectively. Other joint torques co rrelated with gait parameters but did not add significantly to the multivar iate model. Conclusions: Hip extension torque was the only significant independent pred ictor for free walking velocity, stride length, and cadence in this group. These results support the idea that strengthening the hip extensors may imp rove stride characteristics in elderly individuals.