Twice-a-day training improves mitochondrial efficiency, but not mitochondrial biogenesis, compared with once-daily training
2019
Ghiarone, T. | Andrade-Souza, V. A. | Learsi, S. K. | Tomazini, F. | Ataide-Silva, T. | Sansonio, A. | Fernandes, M. P. | Saraiva, K. L. | Figueiredo, Rcbq | Tourneur, Y. | Kuang, J. | Lima-Silva, A. E. | Bishop, D. J. | Cardiovasculaire, métabolisme, diabétologie et nutrition (CarMeN) ; Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) ; Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Institut National de la Santé et de la Recherche Médicale (INSERM)
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Afficher plus [+] Moins [-]anglais. Exercise training performed with lowered muscle glycogen stores can amplify adaptations related to oxidative metabolism, but it is not known if this is affected by the "train-low" strategy used (i.e., once-daily versus twice-a-day training). Fifteen healthy men performed three weeks of an endurance exercise (100-min) followed by a high-intensity interval exercise two (twice-a-day group, n=8) or 14 h (once-daily group, n=7) later; therefore, the second training session always started with low muscle glycogen in both groups. Mitochondrial efficiency (state 4 respiration) was improved only for the twice-a-day group (group x training interaction, p\textless0.05). However, muscle citrate synthase activity, mitochondria and lipid area in intermyofibrillar and subsarcolemmal regions, and PGC1alpha, PPARalpha, and electron transport chain relative protein abundance, were not altered with training in either group (p\textgreater0.05). Markers of aerobic fitness (e.g., O2peak) were increased, and plasma lactate, O2 cost, and rating of perceived exertion during a 100-min exercise task were reduced in both groups, although the reduction in rating of perceived exertion was larger in the twice-a-day group (group x time x training interaction, p\textless0.05). These findings suggest similar training adaptations with both training low approaches; however, improvements in mitochondrial efficiency and perceived effort seem to be more pronounced with twice-a-day training.
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