A well known response to hypoxia is an increase in ventilation which typically occurs at high altitude (HA).To investigate the ventilatory pattern at rest (r.) and during exercise (ex.), at sea level(SL) and HA we studied 9 elite climbers (M,age 32-52) during the acclimatization period of the italian expedition to Mt Everest. Studies were performed at SL, at Base Camp (5200m) 1°day (BC1) and 9°day(BC2). Breathing pattern and ventilation (VE) were recorded and continuously monitored by calibrated respiratory inductive plethysmography(Lifeshirt®, Vivometrics) during 20‘ r. and during standardized ex. at each altitudes. Conclusion: as expected, at each altitudes VE significantly increases during ex. compared to r. VEr. at HA is significantly > SL due to a significant increase in both TV and RR, with no effect of the acclimatization. VEex. at HA and SL is similar. Exercise at HA induces significant changes in thoracoabdominal coordination with no effect of acclimatization, as demonstrated by the increase in RC% ex.
Effect of altitude on ventilatory pattern in élite climbers during the acclimatization at 5200m
COGO, Annaluisa;POMIDORI, Luca;PAOLUCCI, Elisa;
2005
Abstract
A well known response to hypoxia is an increase in ventilation which typically occurs at high altitude (HA).To investigate the ventilatory pattern at rest (r.) and during exercise (ex.), at sea level(SL) and HA we studied 9 elite climbers (M,age 32-52) during the acclimatization period of the italian expedition to Mt Everest. Studies were performed at SL, at Base Camp (5200m) 1°day (BC1) and 9°day(BC2). Breathing pattern and ventilation (VE) were recorded and continuously monitored by calibrated respiratory inductive plethysmography(Lifeshirt®, Vivometrics) during 20‘ r. and during standardized ex. at each altitudes. Conclusion: as expected, at each altitudes VE significantly increases during ex. compared to r. VEr. at HA is significantly > SL due to a significant increase in both TV and RR, with no effect of the acclimatization. VEex. at HA and SL is similar. Exercise at HA induces significant changes in thoracoabdominal coordination with no effect of acclimatization, as demonstrated by the increase in RC% ex.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
