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

Figure 4

Changes in fiber type population (a), fiber cross-sectional area (b), capillary density (c), and number of satellite cells (d) in pretest of control (Nor Con: normoxic control; Hypo Con: hypoxic control) and posttest (Nor Tr: normoxic training; Hypo Tr: hypoxic training) in normoxic or hypoxic training group. Measurements were performed on muscle samples obtained before the incremental exercise test (pre). White, grey, and black bars in (a), (b), and (d) represent fiber types I, IIa, and IIx, respectively. White and black bars in (c) represent normoxia and hypoxia, respectively. ^†Significant difference versus pretest (). Values are mean ± SEM.

(a) Fiber type population (%)

(b) Fiber cross-sectional area

(c) Capillary/mm²

(d) Satellite cell/fiber