Short-term training alters the control of mitochondrial respiration rate before maximal oxidative ATP synthesis
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Aim: Short-term exercise training may induce metabolic and performance adaptations before any changes in mitochondrial enzyme potential. However, there has not been a study that has directly assessed changes in mitochondrial oxidative capacity or metabolic control as a consequence of such training in vivo. Therefore, we used 31 P-magnetic resonance spectroscopy ( 31 P-MRS) to examine the effect of short-term plantar flexion exercise training on phosphocreatine (PCr) recovery kinetics and the control of respiration rate. Method: To this aim, we investigated 12 healthy men, experienced with this exercise modality (TRA), and 7 time-control subjects (TC). Results: After 5 days of training, maximum work rate during incremental plantar flexion exercise was significantly improved (P < 0.01). During the recovery period, the maximal rate of oxidative adenosine triphosphate synthesis (PRE: 28 Â± 13 mm min -1 ; POST: 26 Â± 15 mm min -1 ) and the PCr recovery time constant (PRE: 31 Â± 19 s; POST: 29 Â± 16) were not significantly altered. In contrast, the Hill coefficient (n H ) describing the co-operativity between respiration rate and ADP was significantly increased in TRA (PRE: n H = 2.7 Â± 1.4; POST: n H = 3.4 Â± 1.9, P < 0.05). Meanwhile, there were no systematic variations in any of these variables in TC. Conclusion: This study reveals that 5 days of training induces rapid adaptation in the allosteric control of respiration rate by ADP before any substantial improvement in muscle oxidative capacity occurs. Â© 2013 Scandinavian Physiological Society.
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