Portable respiratory inductive pletysmography can estimate ventilation at rest ® and during exercise (ex) and identify breathing pattern in both conditions. AIM to assess ventilation (VE) and the rib cage vs abdominal contribution to ventilation (RC%) at r and during ex in healthy well trained subjects at SL and HA. We studied 2 group of subjects: 1) 8 males (age 36-52 ) at SL and at 5200m (1° day at Everest base camp) both at r and during maximal ex with cycloergometer, at SL, and during strenuous hike around base camp monitored by a global positioning system (GPS, Ashtech) at HA. 2) 6 males (age 20-22) were studied only at SL r and during maximal ex running on a treadmill (1% slope increase/min from 0 to 25%). All test were performed while monitoring ventilation and SpO2 with inductive pletysmography (Lifeshirt, Vivometrics, CA). RESULTS Ventilation and RC% at HA are significantly higher than at SL. Exercise induces a significant increase in VE but has no effect in RC% both at SL and HA independently from the type of exercise. At HA a significant correlation (r=0.63) has been found between the decrease in SpO2 during ex and the difference in RC% verus SL. We conclude that exercise (both cycling and running) does not affect the breathing pattern either at SL and HA. The HA hypoxia induces a significantly different breathing pattern both at rest and during exercise.
Breathing pattern at rest and during different exercises at sea level (SL) and at high altitude (HA)
POMIDORI, Luca;GRAZZI, Giovanni;ULIARI, Simone;COGO, Annaluisa
2006
Abstract
Portable respiratory inductive pletysmography can estimate ventilation at rest ® and during exercise (ex) and identify breathing pattern in both conditions. AIM to assess ventilation (VE) and the rib cage vs abdominal contribution to ventilation (RC%) at r and during ex in healthy well trained subjects at SL and HA. We studied 2 group of subjects: 1) 8 males (age 36-52 ) at SL and at 5200m (1° day at Everest base camp) both at r and during maximal ex with cycloergometer, at SL, and during strenuous hike around base camp monitored by a global positioning system (GPS, Ashtech) at HA. 2) 6 males (age 20-22) were studied only at SL r and during maximal ex running on a treadmill (1% slope increase/min from 0 to 25%). All test were performed while monitoring ventilation and SpO2 with inductive pletysmography (Lifeshirt, Vivometrics, CA). RESULTS Ventilation and RC% at HA are significantly higher than at SL. Exercise induces a significant increase in VE but has no effect in RC% both at SL and HA independently from the type of exercise. At HA a significant correlation (r=0.63) has been found between the decrease in SpO2 during ex and the difference in RC% verus SL. We conclude that exercise (both cycling and running) does not affect the breathing pattern either at SL and HA. The HA hypoxia induces a significantly different breathing pattern both at rest and during exercise.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
