The effects of elevated levels of sodium bicarbonate (NaHCO3) on the acute power output and time to fatigue of maximally stimulated mouse soleus and EDL muscles

M.F. Higgins, Jason Tallis, Mike Price, Rob S. James

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    This study examined the effects of elevated buffer capacity [~32 mM HCO3 -] through administration of sodium bicarbonate (NaHCO3) on maximally stimulated isolated mouse soleus (SOL) and extensor digitorum longus (EDL) muscles undergoing cyclical length changes at 37 C. The elevated buffering capacity was of an equivalent level to that achieved in humans with acute oral supplementation. We evaluated the acute effects of elevated [HCO3 -] on (1) maximal acute power output (PO) and (2) time to fatigue to 60 % of maximum control PO (TLIM60), the level of decline in muscle PO observed in humans undertaking similar exercise, using the work loop technique. Acute PO was on average 7.0 ± 4.8 % greater for NaHCO3-treated EDL muscles (P < 0.001; ES = 2.0) and 3.6 ± 1.8 % greater for NaHCO3-treated SOL muscles (P < 0.001; ES = 2.3) compared to CON. Increases in PO were likely due to greater force production throughout shortening. The acute effects of NaHCO3 on EDL were significantly greater (P < 0.001; ES = 0.9) than on SOL. Treatment of EDL (P = 0.22; ES = 0.6) and SOL (P = 0.19; ES = 0.9) with NaHCO3 did not alter the pattern of fatigue. Although significant differences were not observed in whole group data, the fatigability of muscle performance was variable, suggesting that there might be inter-individual differences in response to NaHCO3 supplementation. These results present the best indication to date that NaHCO3 has direct peripheral effects on mammalian skeletal muscle resulting in increased acute power output.
    Original languageEnglish
    Pages (from-to)1331-1341
    JournalEuropean Journal of Applied Physiology
    Volume113
    Issue number5
    DOIs
    Publication statusPublished - 2013

    Bibliographical note

    The full text of this item is not available from the repository.
    The final publication is available at www.springerlink.com

    Keywords

    • buffer capacity
    • ergogenic aids
    • force production
    • metabolic alkalosis
    • skeletal muscle
    • work loop

    Fingerprint Dive into the research topics of 'The effects of elevated levels of sodium bicarbonate (NaHCO3) on the acute power output and time to fatigue of maximally stimulated mouse soleus and EDL muscles'. Together they form a unique fingerprint.

  • Cite this