C. W E B B E R
M . P O R T E R
Department of Physiology, Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, CANADA;
Leisure and Human Performance Research Institute, Faculty of Kinesiology and Recreation Management, University of
Manitoba, Winnipeg, Manitoba,
S. C. and
M . M . PORTER. Effects of Ankle Power Training on Movement Time
in Mobility-Impaired Older Women.
Med. Sci. Sports Exerc,
Vol. 42, No. 7, pp. 1233-1240, 2010.
Reduced abilities to generate power put older adults at risk in
situations that demand rapid movements. Slower movement times are associated with greater risk of falling and of being involved in a
motor vehicle crash. The purpose of this study was to determine the effects of power training on foot movement time and. secondarily,
on ankle strength and power in mobility-impaired older women.
Fifty mobility-impaired women (70-88 yr) trained twice per
12 wk in one of three groups (weights, elastic bands, or placebo control). All groups performed seated warm-up exercises,
by either concentric dorsiflexion (DF) and plantarflexion (PF) resistance exercises (weights and bands) performed "as fast as
possible" or upper body flexibility exercises (control). Foot reaction/movement time and ankle DF and PF peak torque (30°s
peak power (90°-s
) were measured before and after training.
Participants who trained with elastic bands demonstrated
in movement time (decreased
by 24 ins or 12%,
= 0.003). All groups demonstrated improvements
in DF and PF
strength and power, which were not statistically different.
High-velocity/low-load (elastic bands) training improved
movement time, which may have important implications in circumstances when rapid generation of torque is required (e.g.
. to avoid a
fall or prevent a vehicle crash). Elastic bands are relatively inexpensive and provide a practical form of training that could be considered
in programs designed for older adults with mobility limitations.
RESPONSE TIME, AGING, RESISTANCE TRAINING,
HIGH VELOCITY, CONCENTRIC
of muscle mass
and muscle weakness
closely associated with functional decline, loss of