A well known response to HA is the hyperventilation occurring >3000m. Not only the ventilation but also the ventilatory pattern may be a key point of acclimatization especially during exercise. Aim: to study ventilation at rest and during exercise in 8 elite climbers (M, age 36-52) during the Italian Everest expedition. Subjects were studied at sea level and at 5300m (Everest North Base Camp, 1stday), reached after 7 days >3500m. Breathing patterns and ventilation were continuously monitored by respiratory inductive plethysmograph (LifeShirt, VivoMetrics, CA, USA). Measurements were made at rest (30 monitoring) and during exercise. At sea level: a cardiopulmonary exercise test was performed. At HA the climbers covered a set route around base camp. The distance, the slope and the speed were monitored in each subject by means of a portable global positioning system (GPS). Results expressed as mean valueSD. At HA: total time of exercise 17,5min8; distance 905,884400m; slope 9,2%2,3; speed 0,95m/s0,012. A significant inverse correlation has been found between RC% and: speed (r=0,72 p=0,02), slope (r=0,58 p=0,028), difference in altitude (r=0,88 p=0,01) and the SpO2% rest-exercise (r=0,58 p=0,028).Conclusions: acute exposure to hypoxia induces an increase in ventilation both at rest and during exercise; during the first days of acclimatization the subjects climbing with a slower step show a better thoracoabdominal coordination and a lower decrease of SpO2 during exercise This results should be taken into account when planning the ascent profile and the physical effort during HA mountaineering.
Strong Exercise at High Altitude (HA) Reduces Thoraco-Abdominal Coordination
COGO, Annaluisa;PAOLUCCI, Elisa;POMIDORI, Luca;
2006
Abstract
A well known response to HA is the hyperventilation occurring >3000m. Not only the ventilation but also the ventilatory pattern may be a key point of acclimatization especially during exercise. Aim: to study ventilation at rest and during exercise in 8 elite climbers (M, age 36-52) during the Italian Everest expedition. Subjects were studied at sea level and at 5300m (Everest North Base Camp, 1stday), reached after 7 days >3500m. Breathing patterns and ventilation were continuously monitored by respiratory inductive plethysmograph (LifeShirt, VivoMetrics, CA, USA). Measurements were made at rest (30 monitoring) and during exercise. At sea level: a cardiopulmonary exercise test was performed. At HA the climbers covered a set route around base camp. The distance, the slope and the speed were monitored in each subject by means of a portable global positioning system (GPS). Results expressed as mean valueSD. At HA: total time of exercise 17,5min8; distance 905,884400m; slope 9,2%2,3; speed 0,95m/s0,012. A significant inverse correlation has been found between RC% and: speed (r=0,72 p=0,02), slope (r=0,58 p=0,028), difference in altitude (r=0,88 p=0,01) and the SpO2% rest-exercise (r=0,58 p=0,028).Conclusions: acute exposure to hypoxia induces an increase in ventilation both at rest and during exercise; during the first days of acclimatization the subjects climbing with a slower step show a better thoracoabdominal coordination and a lower decrease of SpO2 during exercise This results should be taken into account when planning the ascent profile and the physical effort during HA mountaineering.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
