OXYGEN-TRANSPORT SYSTEM BEFORE AND AFTER EXPOSURE TO CHRONIC HYPOXIA

被引:41
作者
FERRETTI, G
BOUTELLIER, U
PENDERGAST, DR
MOIA, C
MINETTI, AE
HOWALD, H
DIPRAMPERO, PE
机构
[1] SWISS SCH PHYS EDUC & SPORTS, RES INST, MAGGLINGEN, SWITZERLAND
[2] SUNY BUFFALO, DEPT PHYSIOL, BUFFALO, NY 14260 USA
[3] UNIV UDINE, INST BIOL, I-33100 UDINE, ITALY
关键词
D O I
10.1055/s-2007-1024848
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Maximal VO2 on the treadmill (VO2max) and on the bicycle ergometer (VO2peak), maximal cardiac output (Qmax), by a CO2 rebreathing method, maximal heart rate (HRmax), blood hemoglobin concentration (Hb), and hematocrit (Hct) were measured on six subjects before (B) and 3 weeks after (A) prolonged exposure to chronic hypoxia. It was observed that after high-altitude exposure VO2max, VO2peak, and Qmax were lower (P < 005) than before [A: 4.13 ± 0.67; 3.28 ± 0.41 and 16.89 ± 2.49 (1/min ± SD); B: 4.39 ± 0.39; 3.53 ± 0.34 and 21.81 ± 1.27, respectively}, whereas Hb and Hct were larger (A: 162 ± 8 g/l and 0.46 ± 0.02; B: 142 ± 7 and 0.41 ± 0.02) and HRmax was unchanged (178 ± 7 vs 175 ± 9 bts/min). Thus, we calculated stroke volume of the heart and the Hb flow at VO2 peak were lower in A than in B (95 ± 15 vs 124 ± 7 ml and 2,723 ± 307 vs 3,129 ± 196 g/min) (P < 0.05, respectively), whereas the arteriovenous O2 difference was greater in A than in B (195 ± 16 vs 162 ± 19 ml O2/l; P < 0.05). At any given submaximal work load, VO2 and HR were the same in B and in A, whereas Q was lower in A by ~ 2-3 l/min. However, because of the increased Hb, leading to a higher arterial O2 content, at any work load the O2 flow remained unchanged.
引用
收藏
页码:S15 / S20
页数:6
相关论文
共 22 条
[1]   PLASMA ERYTHROPOIETIN IN MEN AND MICE DURING ACCLIMATIZATION TO DIFFERENT ALTITUDES [J].
ABBRECHT, PH ;
KITTELL, JK .
JOURNAL OF APPLIED PHYSIOLOGY, 1972, 32 (01) :54-&
[2]  
ASTRAND PO, 1964, OXYGEN ANIMAL ORGANI, P295
[3]  
Astrand PO, 1977, TXB WORK PHYSL
[4]   A MULTIDISCIPLINARY APPROACH TO THE STUDY OF THE EFFECTS OF ALTITUDE ON MUSCLE STRUCTURE AND FUNCTION [J].
CERRETELLI, P ;
DIPRAMPERO, PE .
INTERNATIONAL JOURNAL OF SPORTS MEDICINE, 1990, 11 :S1-S2
[5]   LIMITING FACTORS TO OXYGEN-TRANSPORT ON MOUNT EVEREST [J].
CERRETELLI, P .
JOURNAL OF APPLIED PHYSIOLOGY, 1976, 40 (05) :658-667
[6]  
Cerretelli P, 1980, PULMONARY GAS EXCHAN, P97
[7]  
Cerretelli P, 1987, HDB PHYSL, P297
[8]   RATE OF ERYTHROPOIETIN FORMATION IN HUMANS IN RESPONSE TO ACUTE HYPOBARIC HYPOXIA [J].
ECKARDT, KU ;
BOUTELLIER, U ;
KURTZ, A ;
SCHOPEN, M ;
KOLLER, EA ;
BAUER, C .
JOURNAL OF APPLIED PHYSIOLOGY, 1989, 66 (04) :1785-1788
[9]   EFFECT OF TRAINING ON CIRCULATORY RESPONSE TO EXERCISE [J].
EKBLOM, B ;
ASTRAND, PO ;
SALTIN, B ;
STENBERG, J ;
WALLSTROM, B .
JOURNAL OF APPLIED PHYSIOLOGY, 1968, 24 (04) :518-+
[10]   CARDIAC-OUTPUT DETERMINATION BY SIMPLE ONE-STEP REBREATHING TECHNIQUE [J].
FARHI, LE ;
NESARAJAH, MS ;
OLSZOWKA, AJ ;
METILDI, LA ;
ELLIS, AK .
RESPIRATION PHYSIOLOGY, 1976, 28 (01) :141-159