Abstract
There is limited understanding of the mitochondrial adaptation following repeated eccentric exercise bouts, a model resulting in muscle adaptation known as the repeat bout effect. It was hypothesized that downhill training would reduce mitochondrial calcium content (MCC) post an acute eccentric bout with concurrent improvements in mitochondrial respiratory function. Thirty-four Sprague–Dawley rats were divided into four groups: control (N), control with acute eccentric exercise (N ecc), trained control (X) and trained with acute eccentric exercise (X ecc). Training for X and X ecc consisted of 30 min per day for five consecutive days of downhill treadmill running. The acute eccentric exercise bout was a −14° treadmill exercise for 90 min performed 2 weeks after the training period. Animals were killed 48 h post-exercise. Isolated mitochondria from the red quadriceps allowed for the measure of mitochondrial respiratory indices and MCC. Calpain activity and heat shock protein 72 expression (HSP72) were also measured. MCC dramatically increased following the acute bout of eccentric exercise in N ecc (p < 0.001), but did not change in X ecc. Mitochondrial respiratory function tended to be slightly depressed in N ecc (state 3 respiration, p = 0.053; respiratory control ratio, p = 0.098) and unaltered in X ecc. Previous training altered the calpain and heat shock protein response to an acute bout of eccentric exercise. The results suggest that downhill exercise training improves mitochondrial calcium homeostasis following an acute bout of prolonged eccentric exercise and may stabilize mitochondrial respiratory function. These improvements coincide with a reduction in calpain activity and heat shock protein upregulation.
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Sports Knowledge Australia is acknowledged for providing PhD scholarship funding for Dr Ben Rattray.
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Communicated by Håkan Westerblad.
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Rattray, B., Thompson, M., Ruell, P. et al. Specific training improves skeletal muscle mitochondrial calcium homeostasis after eccentric exercise. Eur J Appl Physiol 113, 427–436 (2013). https://doi.org/10.1007/s00421-012-2446-1
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DOI: https://doi.org/10.1007/s00421-012-2446-1