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  • Author: Stephen B. Kritchevsky x
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Anthony P. Marsh, Michael E. Miller, W. Jack Rejeski, Stacy L. Hutton and Stephen B. Kritchevsky

It is unclear whether strength training (ST) or power training (PT) is the more effective intervention at improving muscle strength and power and physical function in older adults. The authors compared the effects of lower extremity PT with those of ST on muscle strength and power in 45 older adults (74.8 ± 5.7 yr) with self-reported difficulty in common daily activities. Participants were randomized to 1 of 3 treatment groups: PT, ST, or wait-list control. PT and ST trained 3 times/wk for 12 wk using knee-extension (KE) and leg-press (LP) machines at ~70% of 1-repetition maximum (1RM). For PT, the concentric phase of the KE and LP was completed “as fast as possible,” whereas for ST the concentric phase was 2–3 s. Both PT and ST paused briefly at the midpoint of the movement and completed the eccentric phase of the movement in 2–3 s. PT and ST groups showed significant improvements in KE and LP 1RM compared with the control group. Maximum KE and LP power increased approximately twofold in PT compared with ST. At 12 wk, compared with control, maximum KE and LP power were significantly increased for the PT group but not for the ST group. In older adults with compromised function, PT leads to similar increases in strength and larger increases in power than ST.

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Roland J. Thorpe Jr., Regina A. Kreisle, Lawrence T. Glickman, Eleanor M. Simonsick, Anne B. Newman and Stephen Kritchevsky

Pet ownership among older adults was investigated to determine whether dog owners were more likely to engage in physical activity than non-dog-pet or non–pet owners. The relationship between pet ownership and physical activity was examined using data from the Health ABC study. After age, race, education level, number of assets, family income, and site were adjusted for dog owners were more likely than non–pet owners to have engaged in non-exercise-related walking in the preceding week but did not differ from non–pet owners in walking for exercise or any physical activity. In contrast, non-dog-pet owners did not differ from non–pet owners in non-exercise-related walking in the preceding week and were less likely than non–pet owners to have engaged in walking for exercise or any physical activity in the preceding week. The activity-related benefits of pet ownership in older adults were limited to dog owners, who engaged in greater overall physical activity—non-exercise-related walking, in particular. Whether pet-related physical activity is sufficient to provide health benefits requires longitudinal investigation.