Exercise responses after altitude acclimatization are retained during reintroduction to altitude

被引:47
作者
Beidleman, BA [1 ]
Muza, SR [1 ]
Rock, PB [1 ]
Fulco, CS [1 ]
Lyons, TP [1 ]
Hoyt, RW [1 ]
Cymerman, A [1 ]
机构
[1] USA, Res Inst Environm Med, Thermal & Mt Med Div, Natick, MA 01760 USA
关键词
deacclimatization; ventilation; heart rate; plasma volume; lactate;
D O I
10.1097/00005768-199712000-00007
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Following 2 to 3 wk of altitude acclimatization, ventilation is increased and heart rate (HR), plasma volume (PV), and lactate accumulation ([La]) are decreased during submaximal exercise. The objective of this study was to determine whether some degree of these exercise responses associated with acclimatization would be retained upon reintroduction to altitude (RA) after 8 d al sea level (SL). Six male Lowlanders ((X) over bar +/- SE; 31 +/- 2 pr, 82.4 +/- 4.6 kg) exercised to exhaustion at the same relative percentages of peak oxygen uptake ((V) over dot O-2peak) at SL, on acute altitude (AA) exposure, after a 16-d chronic altitude (CA) exposure on Pikes Peak (4,300 m), and during a 3- to 4-h RA in a hypobaric chamber (4,300 m; 446 mm Hg) after 8 d at SL. The submaximal exercise to exhaustion time (min) was the same at SL (66.0 +/- 1.6), AA (67.7 +/- 7.3), CA (79.9 +/- 6.2), and RA (67.9 +/- 1.9). At 75% (V) over dot O-2peak: (1) arterial oxygen saturation (SaO(2)) increased from AA to CA (67.0 +/- 1.5 vs 78.5 +/- 1.8%; P < 0.05) and remained increased at RA (77.0 +/- 2.0%); (2) HR decreased from SL to CA (171 +/- 6 vs 152 +/- 9 beats.min(-1); P < 0.05) and remained decreased at RA (157 +/- 5 beats.min(-1)); (3) calculated PV decreased 6.9 +/- 10.0% at AA, 21.3 +/- 11.1% at CA, and 16.7 +/- 5.4% at RA from SL baseline values, and (4) [La] decreased from AA to CA(5.1 +/- 0.9 vs 1.9 +/- 0.4 mmol.L-1; P < 0.05) and remained decreased at RA (2.6 +/- 0.6 mmol.L-1). Upon RA after 8 d at SL, the acclimatization responses were retained 92 +/- 9% for SaO(2), 74 +/- 8% for PV, and 58 +/- 3% for [La] at 75% (V) over dot O-2peak. In conclusion, although submaximal exercise to exhaustion time is not improved upon reintroduction to altitude after 8 d at sea level, retention of beneficial exercise responses associated with altitude acclimatization is likely in individuals whose work, athletic competition, or recreation schedules involve intermittent sojourns to high elevations.
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页码:1588 / 1595
页数:8
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