Master of Science
Dr. Glen Belfry
The purpose was to compare the physiological responses to periodic 5 s breath holds (CBH), increased power output (FLK), and both (FBH) every 30 s followed by 25 s of continuous heavy intensity cycling exercise with free-breathing (CON). Minute ventilation (V̇ E) was greater (p < 0.05) in CBH (97.58 + 16 L·min-1) and FBH (100.9 + 19 L·min-1), pulmonary oxygen uptake (V̇ O2p) was similar in CBH (2.73 + 0.14 L·min-1) and FBH (2.73 + 0.14 L·min-1) and greater in FLK (2.85 + 0.12 L·min-1), compared to CON (2.71 + 0.12 L·min-1). FBH also resulted in slower V̇ O2p kinetics (62.2 + 19 s) and greater blood lactate concentrations (11.5 + 2.7 mM), compared to CON (48.8 + 12 s; 9.0 + 2.3 mM). Together, we demonstrated that breath hold-induced hypoxemia and hypercapnia were resolved when not combined with additional work.
Lim, David J., "Physiological Resolution of Periodic Breath Holding During Heavy Intensity Fartlek Exercise" (2017). Electronic Thesis and Dissertation Repository. 4600.