Abstract
Hypobaric hypoxia (HH) leads to various adverse effects on skeletal muscles, including atrophy and reduced oxidative work capacity. However, the effects of HH on muscle fatigue resistance and myofiber remodeling are largely unexplored. Therefore, the present study aimed to explore the impact of HH on slow-oxidative fibers and to evaluate the ameliorative potential of exercise preconditioning and nanocurcumin formulation on muscle anti-fatigue ability. C2C12 cells (murine myoblasts) were used to assess the effect of hypoxia (0.5%, 24 h) with and without the nanocurcumin formulation (NCF) on myofiber phenotypic conversion. To further validate this hypothesis, male Sprague Dawley rats were exposed to a simulated HH (7620 m) for 7 days, along with NCF administration and/or exercise training. Both in vitro and in vivo studies revealed a significant reduction in slow-oxidative fibers (p < 0.01, 61% vs. normoxia control) under hypoxia. There was also a marked decrease in exhaustion time (p < 0.01, 65% vs. normoxia) in hypoxia control rats, indicating a reduced work capacity. Exercise preconditioning along with NCF supplementation significantly increased the slow-oxidative fiber proportion and exhaustion time while maintaining mitochondrial homeostasis. These findings suggest that HH leads to an increased transition of slow-oxidative fibers to fast glycolytic fibers and increased muscular fatigue. Administration of NCF in combination with exercise preconditioning restored this myofiber remodeling and improved muscle anti-fatigue ability.
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The authors sincerely thank the Director of the Defense Institute of Physiology and Allied Science for providing the necessary resources for conducting the present study. One of the authors, Ms. Asha D Kushwaha, is thankful for obtaining a research fellowship from DRDO.
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All authors participated in the conceptualization and design of the study. ADK experimented and analyzed the data. ADK wrote the manuscript. RV helped during planning and conceptualization of this work. DS has read and approved the final manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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The Institutional Animal Ethical Committee (IAEC) approved the present research work on animal experiments with reference no. DIPAS/IAEC/2018/10–02, and the experiments were performed following the regulations specified by the IAEC and conformed to the National Guidelines on the Care and Use of Laboratory Animals, India.
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Key points
1. Hypobaric hypoxia augments the transition of myofibers from slow (oxidative fatigue-resistant) to fast (glycolytic fatigue-susceptible), resulting in a decreased oxidative work capacity.
2. Combinatorial therapy of exercise preconditioning with nanocurcumin formulation (NCF) prevents myofiber transition and thus improves exercise time to exhaustion.
3. NCF administration along with exercise preconditioning also maintains mitochondrial and metabolic homeostasis through PGC1α/SIRT1/AMPK signaling under hypobaric hypoxia condition.
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Kushwaha, A.D., Varshney, R. & Saraswat, D. Effect of hypobaric hypoxia on the fiber type transition of skeletal muscle: a synergistic therapy of exercise preconditioning with a nanocurcumin formulation. J Physiol Biochem 79, 635–652 (2023). https://doi.org/10.1007/s13105-023-00965-1
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DOI: https://doi.org/10.1007/s13105-023-00965-1