PMID- 15072716
OWN - NLM
STAT- MEDLINE
DCOM- 20040701
LR  - 20061115
IS  - 1527-0297 (Print)
IS  - 1527-0297 (Linking)
VI  - 5
IP  - 1
DP  - 2004 Spring
TI  - Absence of work efficiency differences during cycle ergometry exercise in 
      Bolivian Aymara.
PG  - 41-59
AB  - This study tested the hypothesis that Andean natives are adapted to high altitude 
      (HA) via high work efficiency during exercise in hypoxia. A total of 186 young 
      males and females were tested in Bolivia, comprising eight different subject 
      groups. Groups were identified based on gender, ancestry (Aymara vs. European), 
      altitude of birth (highlands vs. lowlands), and the altitude where tested (420, 
      3600, 3850 m). This design allows partitioning of ancestral (i.e., genetic) and 
      developmental effects. To minimize measurement error, subjects were given two 
      submaximal exercise tests on a cycle ergometer (on separate days). Each test 
      consisted of four 5-min work bouts (levels), each separated by a 5-min rest 
      period. For all groups, the oxygen consumption (V(O2))-work rate relationship was 
      not different from the sea-level reference. Gross and net efficiencies (GE and 
      NE) were not different between groups at any work level, with the exception of 
      European men born in the lowlands and acclimatized and tested at 3600 m. These 
      men showed slightly lower V(O2) at high work output, but this may be due to a 
      nonsteady-state V(O2) kinetic, rather than to an altered steady-state V(O2)-work 
      rate relationship per se. There were no significant group differences in delta 
      efficiency (DE). In sum, these results provide no support for the hypothesis of 
      energetic advantage during submaximal work in Andean HA natives. A review and 
      analysis of the literature suggest that the same is true for HA natives in the 
      Himalayas.
FAU - Brutsaert, Tom D
AU  - Brutsaert TD
AD  - Department of Anthropology, The University at Albany, SUNY, Albany, NY 12222, 
      USA. tbrutsae@csc.albany.edu
FAU - Haas, Jere D
AU  - Haas JD
FAU - Spielvogel, Hilde
AU  - Spielvogel H
LA  - eng
PT  - Clinical Trial
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - United States
TA  - High Alt Med Biol
JT  - High altitude medicine & biology
JID - 100901183
SB  - IM
MH  - *Acclimatization/genetics/physiology
MH  - Adolescent
MH  - Adult
MH  - *Altitude
MH  - Analysis of Variance
MH  - Bolivia
MH  - Efficiency
MH  - Ergometry
MH  - Europe
MH  - Exercise/*physiology
MH  - Female
MH  - Humans
MH  - *Indians, South American
MH  - Male
MH  - *Oxygen Consumption
MH  - Task Performance and Analysis
MH  - Time Factors
MH  - *Work Capacity Evaluation
EDAT- 2004/04/10 05:00
MHDA- 2004/07/02 05:00
CRDT- 2004/04/10 05:00
PHST- 2004/04/10 05:00 [pubmed]
PHST- 2004/07/02 05:00 [medline]
PHST- 2004/04/10 05:00 [entrez]
AID - 10.1089/152702904322963681 [doi]
PST - ppublish
SO  - High Alt Med Biol. 2004 Spring;5(1):41-59. doi: 10.1089/152702904322963681.