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. GROUP 1 VEr L/min VEex L/min RC% r RC% ex SpO2 r SpO2 ex SL 15.5±5.7 48.5±3.5° 66.5±5.7 63.3±5.8 97.5±0.22 98.2±0.3 HA 21.3±7 56.5±4.3° 76.4±6.2* 78±6* 73.4±6.9 63.6±3.4 *p<0.05 versus SL °p<0.05 versus rest GROUP 2 Ve r L/min Ve ex L/min RC% r RC% ex SpO2 r SpO2 ex SL 12.3±4.1 58.3±5* 68.3±4.7 69.1±2.3 97±.5 97.3±.5 * p<0.05 versus rest
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
2008
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. GROUP 1 VEr L/min VEex L/min RC% r RC% ex SpO2 r SpO2 ex SL 15.5±5.7 48.5±3.5° 66.5±5.7 63.3±5.8 97.5±0.22 98.2±0.3 HA 21.3±7 56.5±4.3° 76.4±6.2* 78±6* 73.4±6.9 63.6±3.4 *p<0.05 versus SL °p<0.05 versus rest GROUP 2 Ve r L/min Ve ex L/min RC% r RC% ex SpO2 r SpO2 ex SL 12.3±4.1 58.3±5* 68.3±4.7 69.1±2.3 97±.5 97.3±.5 * p<0.05 versus restI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
