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- W1994223872 abstract "Despite enormous rates of minute ventilation (V̇e) in the galloping Thoroughbred (TB) horse, the energetic demands of exercise conspire to raise arterial Pco 2 (i.e., induce hypercapnia). If locomotory-respiratory coupling (LRC) is an obligatory facilitator of high V̇e in the horse such as those found during galloping (Bramble and Carrier. Science 219: 251–256, 1983), V̇e should drop precipitously when LRC ceases at the galloptrot transition, thus exacerbating the hypercapnia. TB horses ( n = 5) were run to volitional fatigue on a motor-driven treadmill (1 m/s increments; 14–15 m/s) to study the dynamic control of breath-by-breath V̇e, O 2 uptake, and CO 2 output at the transition from maximal exercise to active recovery (i.e., trotting at 3 m/s for 800 m). At the transition from the gallop to the trot, V̇e did not drop instantaneously. Rather, V̇e remained at the peak exercising levels (1,391 ± 88 l/min) for ∼13 s via the combination of an increased tidal volume (12.6 ± 1.2 liters at gallop; 13.9 ± 1.6 liters over 13 s of trotting recovery; P < 0.05) and a reduced breathing frequency [113.8 ± 5.2 breaths/min (at gallop); 97.7 ± 5.9 breaths/min over 13 s of trotting recovery ( P < 0.05)]. Subsequently, V̇e declined in a biphasic fashion with a slower mean response time (85.4 ± 9.0 s) than that of the monoexponential decline of CO 2 output (39.9 ± 4.7 s; P < 0.05), which rapidly reversed the postexercise arterial hypercapnia (arterial Pco 2 at gallop: 52.8 ± 3.2 Torr; at 2 min of recovery: 25.0 ± 1.4 Torr; P < 0.05). We conclude that LRC is not a prerequisite for achievement of V̇e commensurate with maximal exercise or the pronounced hyperventilation during recovery." @default.
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- W1994223872 date "2004-06-01" @default.
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- W1994223872 title "Ventilatory dynamics and control of blood gases after maximal exercise in the Thoroughbred horse" @default.
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- W1994223872 doi "https://doi.org/10.1152/japplphysiol.00998.2003" @default.
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