Acclimatization improves submaximal exercise economy at 5533 m.
We tested whether the better subjective exercise tolerance perceived by mountaineers after altitude acclimatization relates to enhanced exercise economy. Thirty-two mountaineers performed progressive bicycle exercise to exhaustion at 490 m and twice at 5533 m (days 6-7 and day 11), respectively, dur...
| Publicado en: | Scandinavian Journal of Medicine & Science in Sports (John Wiley & Sons, Inc.) Vol. 23; no. 4; pp. 458 - 468 |
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| Autores principales: | , , , , , , , , , , |
| Formato: | Journal Article |
| Publicado: |
John Wiley & Sons, Inc.
Aug2013
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=89023923&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 89023923 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 16000838 NRNW jtl: Scandinavian Journal of Medicine & Science in Sports (John Wiley & Sons, Inc.) issn: 16000838 maglogo: N pubinfo: dt: Aug2013 vid: 23 iid: 4 pid: 52269 pub: John Wiley & Sons, Inc. artinfo: ui: 89023923 104196114 10.1111/j.1600-0838.2011.01403.x 89023923 ppf: 458 ppct: 10 formats: tig: atl: Acclimatization improves submaximal exercise economy at 5533 m. aug: au: Latshang, T. D. Turk, A. J. Hess, T. Schoch, O. D. Bosch, M. M. Barthelmes, D. Merz, T. M. Hefti, U. Hefti, J. Pichler Maggiorini, M. Bloch, K. E. affil: Pulmonary Division, University Hospital Zurich, Zurich Switzerland sug: subj: Acclimatization Exercise Tolerance Mountaineering Exercise Intensity Oxygen Saturation Oxygen Consumption Exercise Test, Cardiopulmonary Spirometry Respiratory Function Tests Diaries Visual Analog Scaling Ergometry Heart Rate Altitude Exercise Physiology Aerobic Exercises Clinical Assessment Tools Scales Prospective Studies P-Value Adult Middle Age Female Male Human Funding Source Adult: 19-44 years Middle Aged: 45-64 years Female Male ab: We tested whether the better subjective exercise tolerance perceived by mountaineers after altitude acclimatization relates to enhanced exercise economy. Thirty-two mountaineers performed progressive bicycle exercise to exhaustion at 490 m and twice at 5533 m (days 6-7 and day 11), respectively, during an expedition to Mt. Muztagh Ata. Maximal work rate ( Wmax) decreased from mean ± SD 356 ± 73 watts at 490 m to 191 ± 49 watts and 193 ± 45 watts at 5533 m, days 6-7 and day 11, respectively; corresponding maximal oxygen uptakes ( VO2max) were 50.7 ± 9.5, 26.3 ± 5.6, 24.7 ± 7.0 m L/min/kg ( P = 0.0001 5533 m vs 490 m). On days 6-7 (5533 m), VO2 at 75% Wmax (152 ± 37 watts) was 1.75 ± 0.45 L/min, oxygen saturation 68 ± 8%. On day 11 (5533 m), at the same submaximal work rate, VO2 was lower (1.61 ± 0.47 L/min, P < 0.027) indicating improved net efficiency; oxygen saturation was higher (74 ± 7%, P < 0.0004) but ratios of VO2 to work rate increments remained unchanged. On day 11, mountaineers climbed faster from 4497 m to 5533 m than on days 5-6 but perceived less effort (visual analog scale 50 ± 15 vs 57 ± 20, P = 0.006) and reduced symptoms of acute mountain sickness. We conclude that the better performance and subjective exercise tolerance after acclimatization were related to regression of acute mountain sickness and improved submaximal exercise economy because of lower metabolic demands for non-external work-performing functions. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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