Evaluating the Importance of the Carotid Chemoreceptors in Controlling Breathing during Exercise in Man
No detectable PaCO2 rise above the normal range during exercise even when frequently sampled. (a) Mean breathing. (b) Mean ± se change in brachial PaCO2 from resting values (PaCO2) and mean change in pHa (pHa) during rest followed by the 6 min exercise period (average values for the 8 subjects displayed in 10 s time bins) with cycling at ~0.6 kW (80% of their lactic acidosis threshold), ~0.9 kW, and ~1.1 kW (mean max. was 3.6 L O2 min−1 = 1.2 kW) in 8 subjects. (c) Mean ± se PaCO2 during the first minute only. * rest (repeated measures ANOVA). Reproduced with permission from Stringer et al. .
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