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Myofibril and sarcoplasmic reticulum changes during muscle development: activity vs inactivity.
1Department of Physical Education and Sport Studies, University of Alberta, Edmonton, Canada.
The International Journal of Biochemistry
|January 1, 1987
Summary
Skeletal muscle adaptations to exercise in young rats are temporary, returning to normal when training stops. Early training before puberty offers no long-term advantage over adult-onset training.
Area of Science:
- Exercise physiology
- Skeletal muscle biology
- Developmental adaptations
Background:
- Exercise induces biochemical changes in skeletal muscle.
- Understanding the persistence of these adaptations into adulthood is crucial.
Purpose of the Study:
- To investigate if exercise-induced biochemical changes in young rat skeletal muscle persist into adulthood.
- To compare the effects of early-life training versus adult-onset training.
Main Methods:
- Young rats (10 days old) were subjected to different exercise and rest regimens for 12 weeks.
- Biochemical assays measured myofibril ATPase and sarcoplasmic reticulum Ca2+ uptake/ATPase activity.
- Control, training, rest-exercise (R-E), and exercise-rest (E-R) groups were analyzed.
Main Results:
- Training lowered myofibril and sarcoplasmic reticulum ATPase activity compared to controls.
- Cessation of training (E-R group) led to ATPase activities comparable to controls.
- Initiating training before puberty did not confer a greater adaptive capacity than adult training.
Conclusions:
- Exercise-induced skeletal muscle adaptations in young rats are reversible upon cessation of training.
- Early-life training does not enhance long-term adaptive capacity compared to adult training.