The aim of this study was to verify whether the mean percentage oxygen use in aerobic-anaerobic transition phase or isocapnic buffering (IB) lower women with chronic fatigue syndrome (CFS) compared healthy women, and if variable could be used as a screening biomarker for diagnosis CFS A cross-sectional conducted. Forty-four adult (22 22 healthy) performed cycle ergometer stress test gas analyse...

During exercise, ventilation for a given work rate is increased in pulmonary hypertension. In the present editorial a new look at the ventilatory behaviour, which may change the common approach to VE/VCO2 relationship analysis, is presented. The behaviour of ventilation (VE) in a ramp protocol exercise test is peculiar, and it implies relevant physiological information. In a healthy individual,...

INTRODUCTION Sepsis may be associated with disturbances in cerebral oxygen transport and cerebral haemodynamic function, thus rendering the brain particularly susceptible to hypoxia. The purpose of this study was to assess the impact of isocapnic hypoxia and hyperoxia on dynamic cerebral autoregulation in a human-experimental model of the systemic inflammatory response during the early stages o...

Acute bronchoconstriction after isocapnic hyperpnea can be produced in most asthmatic individuals. However, the existence of a late-phase response is less certain. We used a canine model of isocapnic hyperpnea to test the hypothesis that this discrepancy is due to differences in the challenge threshold for the responses. Acute-phase and late-phase bronchoconstriction was measured in nine dogs a...

Sleep-related respiratory disturbances are more common in men than in premenopausal women. This might, in part, be due to different susceptibilities to the respiratory depressant effects of hypoxia. Therefore, we compared ventilation during 10 min of baseline room-air breathing and 20-min sustained isocapnic hypoxia (fractional inspired O2 = 11%, arterial saturation of O2 approximately 80%) fol...

Cerebral blood flow (CBF) is temporally related to exercise-induced changes in partial pressure of end-tidal carbon dioxide (PetCO2 ); hyperoxia is known to enhance this relationship. We examined the hypothesis that preventing PetCO2 from rising (isocapnia) during submaximal exercise with and without hyperoxia [end-tidal Po2(PetO2 ) = 300 mmHg] would attenuate the increases in CBF. Additionally...

Reliable multicast delivery requires that a multicast message be received by all members in a group. Hence certain or all members need to buffer messages for possible retransmissions. Designing an efficient buffer management algorithm is challenging in large multicast groups where no member has complete group membership information and the delivery latency to different members could differ by o...