Submaximal exercise quantified as percent of normoxic and hyperoxic maximum oxygen uptakes

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Abstract
BYRNES, WILLIAM C, PATRICIA M. MIHEVIC, PATTY S. FREEDSON, and STEVEN M. HORVATH. Submaximal exercise quantified as percent of normoxic and hyperoxic maximum oxygen uptakes. Med. Sri. Sports Exerc., Vol. 16, No. 6, pp. 572–577, 1984. Maximum oxygen uptake (VO2max) was measured in six college-aged males under normoxic (NVO2max) and hyperoxic (HVO2max; 70% oxygen) conditions. Subjects then randomly performed the following three 20-min submaximal exercise bouts: 75% normoxic VO2max under normoxia (NVO2N), 75% normoxic VO2max under hyperoxia (NVO2H), and 75% hyperoxic VO2max under hyperoxia (HVO2H). Metabolic parameters were obtained at 5-min intervals. Hyperoxia resulted in a 13% increase (P2max (NVO2max = 3.54 1 min-1 vs HVO2max = 4.00 l.min-1). Significant (P2), carbon dioxide production (VCO2), or respiratory exchange ratio (R) during hyperoxia at the same absolute power output (NVO2N vs NVO2H). However, at the same relative power outputs (NVO2N vs HVO2H) no significant changes in VE, epinephrine, norepinephrine, or blood lactate were observed when hyperoxia and normoxia were compared.