Limitation of Aerobic Working Capacity at High Altitude

2015 ◽  
pp. 11-16 ◽  
Author(s):  
R. F. Grover
Keyword(s):  
High Altitude ◽  
Working Capacity ◽  
Aerobic Working Capacity

Effect of high altitude on maximal working capacity.

1966 ◽  
Vol 21 (4) ◽  
pp. 1191-1194 ◽  
Author(s):  
K Klausen ◽  
S Robinson ◽  
E D Micahel ◽  
L G Myhre
Keyword(s):  
High Altitude ◽  
Working Capacity ◽  
Maximal Working Capacity

Does the respiratory system limit the aerobic working capacity of humans?

2000 ◽  
Vol 26 (4) ◽  
pp. 481-487 ◽  
Author(s):  
I. S. Breslav ◽  
M. O. Segizbaeva ◽  
G. G. Isaev
Keyword(s):  
Respiratory System ◽  
Working Capacity ◽  
Aerobic Working Capacity

scholarly journals A strategy for oxygen conditioning at high altitude: comparison with air conditioning

2015 ◽  
Vol 119 (6) ◽  
pp. 719-723 ◽  
Author(s):  
John B. West
Keyword(s):  
Cognitive Impairment ◽  
High Altitude ◽  
Oxygen Concentration ◽  
Working Conditions ◽  
Air Conditioning ◽  
Large Scale ◽  
Oxygen Enrichment ◽  
Physical Working Capacity ◽  
Working Capacity ◽  
Large Numbers

Large numbers of people live or work at high altitude, and many visit to trek or ski. The inevitable hypoxia impairs physical working capacity, and at higher altitudes there is also cognitive impairment. Twenty years ago oxygen enrichment of room air was introduced to reduce the hypoxia, and this is now used in dormitories, hotels, mines, and telescopes. However, recent advances in technology now allow large amounts of oxygen to be obtained from air or cryogenic oxygen sources. As a result it is now feasible to oxygenate large buildings and even institutions such as hospitals. An analogy can be drawn between air conditioning that has improved the living and working conditions of millions of people who live in hot climates and oxygen conditioning that can do the same at high altitude. Oxygen conditioning is similar to air conditioning except that instead of cooling the air, the oxygen concentration is raised, thus reducing the equivalent altitude. Oxygen conditioning on a large scale could transform living and working conditions at high altitude, where it could be valuable in homes, hospitals, schools, dormitories, company headquarters, banks, and legislative settings.

The human thermal portrait and its relations with aerobic working capacity and the blood lactate level

2010 ◽  
Vol 36 (4) ◽  
pp. 447-456 ◽  
Author(s):  
E. B. Akimov ◽  
R. S. Andreev ◽  
Yu. N. Kalenov ◽  
A. A. Kirdin ◽  
V. D. Son’kin ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Lactate Level ◽  
Blood Lactate Level ◽  
Working Capacity ◽  
Aerobic Working Capacity

Aerobic working capacity of Eskimos

1963 ◽  
Vol 18 (4) ◽  
pp. 764-768 ◽  
Author(s):  
K. Lange Andersen ◽  
J. S. Hart
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Maximal Oxygen Uptake ◽  
Pulmonary Ventilation ◽  
Circulatory System ◽  
Maximal Heart Rate ◽  
Working Capacity ◽  
Physiological Capacity ◽  
Caucasian Men ◽  
Aerobic Working Capacity

The aerobic working capacity was measured in eight young Eskimos. Their maximal oxygen uptake averaged 2.6 liter/min. This is considerably lower than that found in young Caucasian men. The heart rate-oxygen uptake relationship also indicates a lower physiological capacity of the Eskimos. Expressing maximal oxygen uptake on a body weight basis brings about substantial agreement with results of experiments on sedentary-living Scandinavian students. The heart rate taken at the end of the maximal work averaged 173 min for the Eskimos which is about 10% lower than found in Caucasian men, indicating that the work test (bicycling) did not activate the circulatory system of the Eskimos maximally. By assuming a linear correlation between heart rate and O2 consumption up to its maximal value, the maximal O2 uptake would have to be 20% greater to give a maximal heart rate similar to that observed in Caucasian men. The pulmonary ventilation efficiency during exercise was found to be lower in Eskimos than in Caucasian men. Submitted on February 7, 1963

Chemical and mechanical adaptations of the respiratory system at rest and during exercise in human pregnancy

2007 ◽  
Vol 32 (6) ◽  
pp. 1239-1250 ◽  
Author(s):  
Dennis Jensen ◽  
Katherine A. Webb ◽  
Denis E. O’Donnell
Keyword(s):  
Respiratory System ◽  
Mechanical Response ◽  
Alternative Hypothesis ◽  
Working Capacity ◽  
Ventilatory Control ◽  
Human Pregnancy ◽  
Female Sex Hormones ◽  
Ventilatory Drive ◽  
Peripheral Chemoreflex ◽  
Aerobic Working Capacity

Human pregnancy is characterized by significant increases in ventilatory drive both at rest and during exercise. The increased ventilation and attendant hypocapnia of pregnancy has been attributed primarily to the stimulatory effects of female sex hormones (progesterone and estrogen) on central and peripheral chemoreflex drives to breathe. However, recent research from our laboratory suggests that hormone-mediated increases in neural (or non-chemoreflex) drives to breathe may contribute importantly to the hyperventilation of pregnancy. This review challenges traditional views of ventilatory control, and outlines an alternative hypothesis of the control of breathing during human pregnancy that is currently being tested in our laboratory. Conventional wisdom suggests that pregnancy-induced increases in central respiratory motor output command in combination with progressive thoraco–abdominal distortion may compromise the normal mechanical response of the respiratory system to exercise, increase the perception of exertional breathlessness, and curtail aerobic exercise performance in otherwise healthy pregnant women. The majority of available evidence suggests, however, that neither pregnancy nor advancing gestation are associated with reduced aerobic working capacity or increased breathlessness at any given work rate or ventilation during exhaustive weight-supported exercise.

Effect of high altitude on maximal working capacity

1967 ◽  
Vol 22 (6) ◽  
pp. 1181-1181
Author(s):  
K. Klausen ◽  
S. Robinson ◽  
E. D. Micahel ◽  
L. G. Myhre
Keyword(s):  
High Altitude ◽  
Working Capacity ◽  
Maximal Working Capacity
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