Authors:
JA Loeppky VA Medical Center, The University of New Mexico, USA

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AC Sheard California State University, USA

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RM Salgado United States Army Research Institute of Environmental Medicine, USA

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CM Mermier The University of New Mexico, USA

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This study compared the ventilation response to an incremental ergometer exercise at two altitudes: 633 mmHg (resident altitude = 1,600 m) and following acute decompression to 455 mmHg (≈4,350 m altitude) in eight male cyclists and runners. At 455 mmHg, the VESTPD at RER <1.0 was significantly lower and the VEBTPS was higher because of higher breathing frequency; at VO2max, both VESTPD and VEBTPS were not significantly different. As percent of VO2max, the VEBTPS was nearly identical and VESTPD was 30% lower throughout the exercise at 455 mmHg. The lower VESTPD at lower pressure differs from two classical studies of acclimatized subjects (Silver Hut and OEII), where VESTPD at submaximal workloads was maintained or increased above that at sea level. The lower VESTPD at 455 mmHg in unacclimatized subjects at submaximal workloads results from acute respiratory alkalosis due to the initial fall in HbO2 (≈0.17 pHa units), reduction in PACO2 (≈5 mmHg) and higher PAO2 throughout the exercise, which are partially pre-established during acclimatization. Regression equations from these studies predict VESTPD from VO2 and PB in unacclimatized and acclimatized subjects. The attainment of ventilatory acclimatization to altitude can be estimated from the measured vs. predicted difference in VESTPD at low workloads after arrival at altitude.

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Editor-in-Chief

László ROSIVALL (Semmelweis University, Budapest, Hungary)

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Anna BERHIDI (Semmelweis University, Budapest, Hungary)

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  • Zsolt RADÁK (University of Physical Education, Budapest, Hungary)
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  • Zoltán BENYÓ (Semmelweis University, Budapest, Hungary)
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  • Zoltán SZELÉNYI (University of Pécs, Hungary)
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2022  
Web of Science  
Total Cites
WoS
335
Journal Impact Factor 1.4
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Physiology (Q4)

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5 Year
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2021  
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Total Cites
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330
Journal Impact Factor 1,697
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Physiology 73/81

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31
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Physiology (medical) (Q3)
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2020  
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Journal
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Impact Factor 1,866
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Citable 42
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Total 0
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Scimago 29
H-index
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Scimago Physiology (medical) Q3
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Scopus 270/1140=1,9
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Scopus 0,528
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Days from  172
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Days from  106
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2019  
Total Cites
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137
Impact Factor 1,410
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1,361
5 Year
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1,221
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Index
0,294
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34
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33
Total
Reviews
1
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9,3
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0,00028
Article Influence
Score
0,215
% Articles
in
Citable Items
97,06
Normalized
Eigenfactor
0,03445
Average
IF
Percentile
12,963
Scimago
H-index
27
Scimago
Journal Rank
0,267
Scopus
Scite Score
235/157=1,5
Scopus
Scite Score Rank
Physiology (medical) 73/99 (Q3)
Scopus
SNIP
0,38

 

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Physiology International
Language English
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