Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m

Charles S. Fulco, Stephen R. Muza, Beth Beidleman, Juli Jones, Janet Staab, Paul B. Rock, Allen Cymerman

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Partial acclimatization resulting from staging at moderate altitude reduces acute mountain sickness during rapid exposure to higher altitudes (e.g., 4300 m). Whether staging also benefits endurance performance has not yet been scientifically evaluated. Purpose: Determine the effectiveness of staging at 2200 m on time trial (TT) performance of unacclimatized sea-level residents (SLR) during rapid exposure to 4300 m. There were 10 healthy men (mean ± SE: 21 ± 1 yrs) who performed 720 kJ cycle TT at SL and following ∼2 h of exposure to 4300 m (459 Torr) before (ALT-1) and after (ALT-2) living for 6 d at 2200 m (601 Torr). Methods: Hemoglobin concentration ([Hb]), hematocrit (Hct), arterial oxygen saturation (SaO2), ratings of perceived exertion (RPE), and heart rate (HR) were measured before and during exercise. Results: Compared to SL (73 ± 6 min), TT performance was impaired (P < 0.01) by 38.1 ± 6 min at ALT-1, but only by 18.7 ± 3 min at ALT-2. The 44 ± 8% TT improvement at 4300 m was directly correlated with increases in exercise SaO2 (R = 0.88, P < 0.03), but not to changes in [Hb] or Hct. In addition, RPE was lower (13 ± 1 vs. 16 ± 1, P < 0.01) and HR remained at ∼148 ± 5 bpm despite performing the TT at a higher power output during ALT-2 than ALT-1 (120 ± 7 vs. 100 ± 10 W, P < 0.01). Conclusion: Partial acclimatization resulting from staging attenuated the impairment in TT performance of SLR rapidly exposed to 4300 m. The close association between improved TT performance and changes in exercise Sao2, compared to a lack of association with changes in [Hb] or Hct, suggest ventilatory acclimatization may have been the major factor contributing to the performance improvement.

Original languageEnglish
Pages (from-to)955-961
Number of pages7
JournalAviation Space and Environmental Medicine
Volume80
Issue number11
DOIs
StatePublished - 1 Nov 2009

Fingerprint

Oceans and Seas
Exercise
Acclimatization
Hematocrit
Heart Rate
Altitude Sickness
Hemoglobins
Oxygen

Keywords

  • Acclimatization
  • Exercise
  • High altitude
  • Moderate altitude
  • Staging

Cite this

Fulco, Charles S. ; Muza, Stephen R. ; Beidleman, Beth ; Jones, Juli ; Staab, Janet ; Rock, Paul B. ; Cymerman, Allen. / Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m. In: Aviation Space and Environmental Medicine. 2009 ; Vol. 80, No. 11. pp. 955-961.
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title = "Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m",
abstract = "Partial acclimatization resulting from staging at moderate altitude reduces acute mountain sickness during rapid exposure to higher altitudes (e.g., 4300 m). Whether staging also benefits endurance performance has not yet been scientifically evaluated. Purpose: Determine the effectiveness of staging at 2200 m on time trial (TT) performance of unacclimatized sea-level residents (SLR) during rapid exposure to 4300 m. There were 10 healthy men (mean ± SE: 21 ± 1 yrs) who performed 720 kJ cycle TT at SL and following ∼2 h of exposure to 4300 m (459 Torr) before (ALT-1) and after (ALT-2) living for 6 d at 2200 m (601 Torr). Methods: Hemoglobin concentration ([Hb]), hematocrit (Hct), arterial oxygen saturation (SaO2), ratings of perceived exertion (RPE), and heart rate (HR) were measured before and during exercise. Results: Compared to SL (73 ± 6 min), TT performance was impaired (P < 0.01) by 38.1 ± 6 min at ALT-1, but only by 18.7 ± 3 min at ALT-2. The 44 ± 8{\%} TT improvement at 4300 m was directly correlated with increases in exercise SaO2 (R = 0.88, P < 0.03), but not to changes in [Hb] or Hct. In addition, RPE was lower (13 ± 1 vs. 16 ± 1, P < 0.01) and HR remained at ∼148 ± 5 bpm despite performing the TT at a higher power output during ALT-2 than ALT-1 (120 ± 7 vs. 100 ± 10 W, P < 0.01). Conclusion: Partial acclimatization resulting from staging attenuated the impairment in TT performance of SLR rapidly exposed to 4300 m. The close association between improved TT performance and changes in exercise Sao2, compared to a lack of association with changes in [Hb] or Hct, suggest ventilatory acclimatization may have been the major factor contributing to the performance improvement.",
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Fulco, CS, Muza, SR, Beidleman, B, Jones, J, Staab, J, Rock, PB & Cymerman, A 2009, 'Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m', Aviation Space and Environmental Medicine, vol. 80, no. 11, pp. 955-961. https://doi.org/10.3357/ASEM.2540.2009

Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m. / Fulco, Charles S.; Muza, Stephen R.; Beidleman, Beth; Jones, Juli; Staab, Janet; Rock, Paul B.; Cymerman, Allen.

In: Aviation Space and Environmental Medicine, Vol. 80, No. 11, 01.11.2009, p. 955-961.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Exercise performance of sea-level residents at 4300 m after 6 days at 2200 m

AU - Fulco, Charles S.

AU - Muza, Stephen R.

AU - Beidleman, Beth

AU - Jones, Juli

AU - Staab, Janet

AU - Rock, Paul B.

AU - Cymerman, Allen

PY - 2009/11/1

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N2 - Partial acclimatization resulting from staging at moderate altitude reduces acute mountain sickness during rapid exposure to higher altitudes (e.g., 4300 m). Whether staging also benefits endurance performance has not yet been scientifically evaluated. Purpose: Determine the effectiveness of staging at 2200 m on time trial (TT) performance of unacclimatized sea-level residents (SLR) during rapid exposure to 4300 m. There were 10 healthy men (mean ± SE: 21 ± 1 yrs) who performed 720 kJ cycle TT at SL and following ∼2 h of exposure to 4300 m (459 Torr) before (ALT-1) and after (ALT-2) living for 6 d at 2200 m (601 Torr). Methods: Hemoglobin concentration ([Hb]), hematocrit (Hct), arterial oxygen saturation (SaO2), ratings of perceived exertion (RPE), and heart rate (HR) were measured before and during exercise. Results: Compared to SL (73 ± 6 min), TT performance was impaired (P < 0.01) by 38.1 ± 6 min at ALT-1, but only by 18.7 ± 3 min at ALT-2. The 44 ± 8% TT improvement at 4300 m was directly correlated with increases in exercise SaO2 (R = 0.88, P < 0.03), but not to changes in [Hb] or Hct. In addition, RPE was lower (13 ± 1 vs. 16 ± 1, P < 0.01) and HR remained at ∼148 ± 5 bpm despite performing the TT at a higher power output during ALT-2 than ALT-1 (120 ± 7 vs. 100 ± 10 W, P < 0.01). Conclusion: Partial acclimatization resulting from staging attenuated the impairment in TT performance of SLR rapidly exposed to 4300 m. The close association between improved TT performance and changes in exercise Sao2, compared to a lack of association with changes in [Hb] or Hct, suggest ventilatory acclimatization may have been the major factor contributing to the performance improvement.

AB - Partial acclimatization resulting from staging at moderate altitude reduces acute mountain sickness during rapid exposure to higher altitudes (e.g., 4300 m). Whether staging also benefits endurance performance has not yet been scientifically evaluated. Purpose: Determine the effectiveness of staging at 2200 m on time trial (TT) performance of unacclimatized sea-level residents (SLR) during rapid exposure to 4300 m. There were 10 healthy men (mean ± SE: 21 ± 1 yrs) who performed 720 kJ cycle TT at SL and following ∼2 h of exposure to 4300 m (459 Torr) before (ALT-1) and after (ALT-2) living for 6 d at 2200 m (601 Torr). Methods: Hemoglobin concentration ([Hb]), hematocrit (Hct), arterial oxygen saturation (SaO2), ratings of perceived exertion (RPE), and heart rate (HR) were measured before and during exercise. Results: Compared to SL (73 ± 6 min), TT performance was impaired (P < 0.01) by 38.1 ± 6 min at ALT-1, but only by 18.7 ± 3 min at ALT-2. The 44 ± 8% TT improvement at 4300 m was directly correlated with increases in exercise SaO2 (R = 0.88, P < 0.03), but not to changes in [Hb] or Hct. In addition, RPE was lower (13 ± 1 vs. 16 ± 1, P < 0.01) and HR remained at ∼148 ± 5 bpm despite performing the TT at a higher power output during ALT-2 than ALT-1 (120 ± 7 vs. 100 ± 10 W, P < 0.01). Conclusion: Partial acclimatization resulting from staging attenuated the impairment in TT performance of SLR rapidly exposed to 4300 m. The close association between improved TT performance and changes in exercise Sao2, compared to a lack of association with changes in [Hb] or Hct, suggest ventilatory acclimatization may have been the major factor contributing to the performance improvement.

KW - Acclimatization

KW - Exercise

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KW - Moderate altitude

KW - Staging

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