The Effects of Age on Stress and The Biomechanics of Slips and Falls

A study was conducted to investigate if stress associated with a fear of falling contributes to the increased incidents of falls among older adults. The investigation compared physiological stress, with biomechanical parameters of walking for twentyeight participants in two age groups: (18-35) and (65 or older). Both age groups were evaluated while walking over dry and slippery floor surfaces. Biomechanical parameters included: step length, required coefficient of friction (RCOF), slip distance, and heel contact velocity. Overall, the results indicated that there were differences between older and younger adult’s biomechanical parameters of walking, and their physiological stress associated with an inadvertent slip. Younger adult’s normal RCOF was higher and their normal step length was longer compared to older adults. Older adult’s stress level after a slip was significantly higher than younger adults. Furthermore, younger and older adults modified their step length differently to avoid slipping, when walking over the slippery floor surface. It was concluded that for the participants in this study some anxiety and stress might be beneficial in reducing the occurrence of inadvertent slips and falls due to an increased awareness of their external environment. Running Title: Stress and the Biomechanics of Slips and Falls