Key result
Indirect low-frequency stimulation induces mitochondrial adaptations in rat skeletal muscle within 7 days.
Why the study?
Exercise models to study skeletal muscle adaptations require long durations and involve systemic factors, limiting their use for muscle-specific contraction-induced adaptations.
This paper provides a detailed surgical protocol for applying chronic contractile activity to rat skeletal muscle, offering a faster, muscle-specific alternative to traditional exercise models.
Hypothesis-generating for rapid mitochondrial remodeling in muscle; leaves open translation to human cardiovascular conditions or practice.
Skeletal muscle is a highly adaptable tissue, as its biochemical and physiological properties are greatly altered in response to chronic exercise. To investigate the underlying mechanisms that bring about various muscle adaptations, a number of exercise protocols such as treadmill, wheel running, and swimming exercise have been used in the animal studies. However, these exercise models require a long period of time to achieve muscle adaptations, which may be also regulated by humoral or neurological factors, thus limiting their applications in studying the muscle-specific contraction-induced adaptations. Indirect low frequency stimulation (10 Hz) to induce chronic contractile activity (CCA) has been used as an alternative model for exercise training, as it can successfully lead to muscle mitochondrial adaptations within 7 days, independent of systemic factors. This paper details the surgical techniques required to apply the treatment of CCA to the skeletal muscle of rats, for widespread application in future studies.
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Kim et al. (2018) studied Skeletal muscle adaptations. Indirect low frequency stimulation to induce chronic contractile activity was evaluated on Muscle mitochondrial adaptations. Indirect low frequency stimulation (10 Hz) to induce chronic contractile activity can successfully lead to muscle mitochondrial adaptations within 7 days in rat skeletal muscle.
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