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05) during HYPO (31 �� 9 s) than in NORMO (20 �� 6 s) or in CON (19 �� 3 s; Fig. 5B). Baseline HR was similar amongst conditions. The HR amplitude was smaller (P < 0.05) in HYPO than in NORMO and CON, while the ��HR was not different amongst conditions (Table 3). Muscle deoxygenation kinetics Baseline ��[HHb] was not different amongst conditions. The ��[HHb] amplitude was greater (P < 0.05) <a href="">Trichostatin A mouse</a> in HYPO than in NORMO and CON (Table 4); the resulting steady-state ��[HHb]/�� ratio also was greater (P < 0.05) in HYPO (12 �� 5 a.u. l?1 min) than in NORMO or CON (both, 9 �� 3 a.u. l?1 min), and there was a transient ��overshoot�� in the normalized ��[HHb]/ ratio during the exercise transition in HYPO that was not seen in the other conditions (Fig. 6). The time course of the overall ��[HHb] response, calculated as the effective time constant (�ӡ�= TD +��) was greater (P < 0.05) in NORMO than in HYPO and CON. Hyperventilation results in a reduction of arterial and [H+], increases in central respiratory <a href="">Casein kinase 2</a> drive and recruitment of additional accessory muscle units (i.e. increased respiratory muscle recruitment). While previous studies observed slower (Hayashi et al. 1999; Chin et al. 2007, 2010a,b) and LBF kinetics (Chin et al. 2010a), it was not apparent whether these observations were a consequence of the hyperventilation-induced hypocapnic alkalosis or due to changes associated with the hyperventilation manoeuvre itself. The present study, therefore, was designed to examine the effect of hyperventilation with (HYPO) and without the associated hypocapnic alkalosis (NORMO) on , LBF and ��[HHb] kinetics during transitions to moderate-intensity exercise. The results of HYPO and CON in the present study are in agreement with previous findings (Chin et al. 2010a), where adjustments of , leg and microvascular blood flow were slowed in HYPO compared with CON. New findings in the present study were that the addition of CO2 to the inspirate to prevent hypocapnic alkalosis (NORMO) had the following results: (i) unchanged FA diameters, which consequently eliminated the slowing in LBF kinetics; (ii) lower muscle deoxygenation amplitude and slower ��[HHb] kinetics, reflecting greater microvascular blood flow and faster microvascular blood flow kinetics compared with HYPO; and (iii) kinetics that were faster compared with HYPO, but still slower than CON. Given the similar increase in ventilation <a href="">Vismodegib mouse</a> between NORMO and HYPO, these findings suggest that the hyperventilation-induced hypocapnia, alkalosis, or both, contributed to the slower conduit artery and muscle microvascular blood flow kinetics [a consequence of conduit artery (and possibly arteriolar) constriction] during HYPO. While the addition of CO2 to prevent the hypocapnic alkalosis restored normal blood flow kinetics, the slowing of still persisted, suggesting an effect of the hyperventilation manoeuvre itself, in contributing to a slower response.
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