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- W2045794568 abstract "This study investigated the hypothesis that adaptations would occur in the sarcoplasmic reticulum in vastus lateralis soon after the onset of aerobic-based training consistent with reduced Ca 2+ -cycling potential. Tissue samples were extracted prior to (0 days) and following 3 and 6 days of cycling performed for 2 h at 60%–65% of peak aerobic power (VO 2peak ) in untrained males (VO 2peak = 47 ± 2.3 mL·kg –1 ·min –1 ; mean ± SE, n = 6) and assessed for changes (nmol·mg protein –1 ·min –1 ) in maximal Ca 2+ -ATPase activity (V max ), Ca 2+ -uptake, and Ca 2+ -release (phase 1 and phase 2) as well as the sarcoplasmic (endoplasmic) reticulum Ca 2+ -ATPase (SERCA) isoforms. Training resulted in reductions (p < 0.05) in SERCA1a at 6 days (–14%) but not at 3 days. For SERCA2a, reductions (p < 0.05) were also noted only at 6 days (–7%). For V max , depressions (p < 0.05) were found at 6 days (172 ± 11) but not at 3 days (176 ± 13; p < 0.10) compared with 0 days (192 ± 11). These changes were accompanied by a lower (p < 0.05) Ca 2+ -uptake at both 3 days (–39%) and 6 days (–48%). A similar pattern was found for phase 1 Ca 2+ -release with reductions (p < 0.05) of 37% observed at 6 days and 23% (p = 0.21) at 3 days of training, respectively. In a related study using the same training protocol and participant characteristics, microphotometric determinations of V max indicated reductions (p < 0.05) in type I at 3 days (–27%) and at 6 days (–34%) and in type IIA fibres at 6 days (–17%). It is concluded that in response to aerobic-based training, sarcoplasmic reticulum Ca 2+ -cycling potential is reduced by adaptations that occur soon after training onset." @default.
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- W2045794568 date "2011-12-01" @default.
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- W2045794568 title "Malleability of human skeletal muscle sarcoplasmic reticulum to short-term training" @default.
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- W2045794568 doi "https://doi.org/10.1139/h11-114" @default.
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