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Acute respiratory muscle unloading by normoxic helium–O2 breathing reduces the O2 cost of cycling and perceived exertion in obese adolescents

Salvadego, Desy
•
Sartorio, Alessandro
•
Agosti, Fiorenza
altro
GRASSI, Bruno
2015
  • journal article

Periodico
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Abstract
Purpose: In obesity, an increased work of breathing contributes to a higher O2 cost of exercise and negatively affects exercise tolerance. The purpose of the study was to determine whether, in obese adolescents, acute respiratory muscle unloading via normoxic helium–O2 breathing reduces the O2 cost of cycling and perceived exertion. Methods: Nine males [age 16.8 ± 1.6 (x ± SD) years, body mass 109.9 ± 15.0 kg] performed on a cycle ergometer, breathing room air (AIR) or a 21 % O2–79 % helium mixture (He–O2): an incremental exercise, for determination of $$ mathop Vlimits^{.} $$V.O2 peak and gas exchange threshold (GET); 12 min constant work rate (CWR) exercises at 70 % of GET (GET) determined in AIR. Results: $$ mathop Vlimits^{.} $$V.O2 peak was not different in the two conditions. From the 3rd to the 12th minute of exercise (both during CWR < GET and CWR > GET), $$ mathop Vlimits^{.} $$V.O2 was lower in He–O2 vs. AIR (end-exercise values: 1.40 ± 0.14 vs. 1.57 ± 0.22 L min−1 GET). During CWR > GET in AIR, $$ mathop Vlimits^{.} $$V.O2 linearly increased from the 3rd to the 12th minute of exercise, whereas no substantial increase was observed in He–O2. The O2 cost of cycling was ~10 % (GET) lower in He–O2 vs. AIR. Heart rate and ratings of perceived exertion for dyspnea/respiratory discomfort and leg effort were lower in He–O2. Conclusions: In obese adolescents, acute respiratory muscle unloading via He–O2 breathing lowered the O2 cost of cycling and perceived exertion during submaximal moderate- and heavy-intensity exercise.
DOI
10.1007/s00421-014-2993-8
WOS
WOS:000347293500007
Archivio
http://hdl.handle.net/11390/1107419
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84938118300
link.springer.de/link/service/journals/00421/index.htm
Diritti
closed access
Soggetti
  • Exercise tolerance

  • Helium–O2 breathing

  • O2 cost of exercise

  • Obesity

  • Respiratory muscle

  • Adolescent

  • Exercise

  • Helium

  • Human

  • Male

  • Obesity

  • Oxygen

  • Perception

  • Physical Exertion

  • Respiratory Muscle

  • Oxygen Consumption

  • Respiration

  • Public Health, Enviro...

  • Orthopedics and Sport...

  • Physiology (medical)

  • Medicine (all)

Scopus© citazioni
13
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
15
Data di acquisizione
Mar 27, 2024
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