Effect of High-Intensity Training in Normobaric Hypoxia on Thoroughbred Skeletal Muscle

Overview

Journal Oxid Med Cell Longev

Publisher Wiley

Specialties Cell Biology
Endocrinology

Date 2016 Oct 11

PMID 27721912

Citations 17

Authors

Hiroshi Nagahisa

Kazutaka Mukai

Hajime Ohmura

Toshiyuki Takahashi

Hirofumi Miyata

Affiliations

Soon will be listed here.

Abstract

Hypoxic training is believed to increase endurance capacity in association with hypoxia inducible factor-1 (HIF-1), a modulator of vascular endothelial growth factor-A (VEGF-A), and to influence activation of satellite cells (SCs). However, the effect of hypoxic training on SC activation and its relation to angiogenesis has not been thoroughly investigated. Eight Thoroughbred horses were subjected to normoxic (F = 21%) or hypoxic (F = 15%) training for 3 days/week (100% [Formula: see text]) for 4 weeks. Incremental exercise tests (IET) were conducted on a treadmill under normoxia and the maximal oxygen consumption ([Formula: see text]) and running distance were measured before and after each training session. Muscle biopsy samples were obtained from the gluteus medius muscle at 6 scheduled times before, during, and one week after IET for immunohistochemical analysis and real-time RT-PCR analysis. Running distance and [Formula: see text], measured during IET, increased significantly after hypoxic training compared with normoxic training. Capillary density and mRNA expression related to SC activation (e.g., myogenin and hepatocyte growth factor) and angiogenesis (VEGF-A) increased only after hypoxic training. These results suggest that increases in mRNA expression after training enhance and prolong SC activation and angiogenesis and that nitric oxide plays an important role in these hypoxia-induced training effects.

Citing Articles

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