Skip to main content
. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Arch Gerontol Geriatr. 2013 May 13;57(2):198–203. doi: 10.1016/j.archger.2013.04.007

Figure 1.

Figure 1

Figure 1

Impact of aging on aerobic capacity. At age 80, the total available energy for use is lower than that at age 70. Therefore, tasks such as walking comprise a greater proportion of the total aerobic capacity in older adults (67% versus 50%); the reserve (energy) available for completing additional activities is reduced.

Potential impact of high energy cost of walking on energy reserves. Higher energy cost of walking utilizes a greater proportion of the total energy capacity. The higher energy cost of walking reduces the reserve energy available to perform additional activities.