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1 School of Exercise and Sport Science and 2 School of Physiotherapy, Faculty of Health Sciences, The University of Sydney, New South Wales 2141, Australia
This study
investigated the adaptations of skeletal muscle sarcoplasmic reticulum
(SR) Ca2+ uptake, relaxation, and
fiber types in young (YW) and elderly women (EW) to high-resistance
training. Seventeen YW (18-32 yr) and 11 EW (64-79 yr) were
assessed for 1) electrically evoked relaxation time and rate of the quadriceps femoris; and
2) maximal rates of SR
Ca2+ uptake and
Ca2+-ATPase activity and relative
fiber-type areas, analyzed from muscle biopsies of the vastus
lateralis. EW had significantly slower relaxation rates and times,
decreased SR Ca2+ uptake and
Ca2+-ATPase activity, and a larger
relative type I fiber area than did YW. A subgroup of 9 young (YWT) and
10 elderly women (EWT) performed 12 wk of high-resistance training (8 repetition maximum) of the quadriceps and underwent identical testing
procedures pre- and posttraining. EWT significantly increased their SR
Ca2+ uptake and
Ca2+-ATPase activity in response
to training but showed no alterations in speed of relaxation or
relative fiber-type areas. In YWT none of the variables was altered
after resistance training. These findings suggest that
1) a reduced SR
Ca2+ uptake in skeletal muscle of
elderly women was partially reversed with resistance training and
2) SR
Ca2+ uptake in the vastus
lateralis was not the rate-limiting mechanism for the slowing of
relaxation measured from electrically evoked quadriceps muscle of
elderly women.
calcium uptake; calcium adenosinetriphosphatase activity; fiber types; relaxation; strength
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