A collaborative study conducted by researchers at Flinders University and the University of Canberra has identified key changes in how the human body manages walking as people age. The investigation analyzed movement data from 107 healthy adults ranging from 26 to 86 years old, revealing consistent patterns in how aging affects locomotion.
The research focused on ankle mechanics and discovered that older adults tend to simultaneously activate opposing muscles around the ankle, a phenomenon called co-contraction. While this stiffening of the joint improves stability when the foot makes contact with the ground, it requires muscles to exert greater effort without producing proportional forward momentum. Additionally, older participants demonstrated reduced push-off power during each step, resulting in shorter strides and decreased walking speeds overall.
According to the research team, these changes reflect a broader shift in how the nervous system manages movement during the aging process. Rather than optimizing for speed and energy efficiency, the body prioritizes remaining upright and balanced. Although this approach enhances safety, it comes with tradeoffs that include increased fatigue during extended walking and reduced ability to recover from balance disturbances, both of which contribute to heightened fall risk in older populations.
The findings suggest practical implications for maintaining mobility throughout later life. The researchers recommend that exercise programs for older adults should extend beyond strength training to incorporate balance work, coordination challenges, and targeted lower-leg exercises. Specific activities such as tai chi, regular physical activity, and exercises that engage different muscle groups during movement may help preserve walking capability and independence. The research team anticipates these insights could inform improved strategies for fall prevention and age-related rehabilitation efforts.
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