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We studied mechanisms of O2 transport in 6 adult (2-5 year old) horses at rest and during steady-state exercise on a treadmill (0% slope) at 12 m/s (a submaximal gallop). Oxygen consumption was measured using an open-flow system. Arterial and mixed venous blood samples were simultaneously obtained for measurement of O2 content and hemoglobin concentration. VO2 increased from 1.5 +/- 0.2 L/min at rest to 46.2 +/- 4.8 L/min during exercise. HR increased from a resting value of 36.9 +/- 2.5 bpm to 196.5 +/- 10.9 bpm and the arterio-venous O2 content difference (a-v O2) increased from 4.2 +/- 0.8 ml O2/100 ml blood to 20.3 +/- 1.6 ml O2/100 ml blood. The 30.4-fold increase in oxygen consumption in the horse at submaximal VO2 versus only a 10-fold increase in man at VO2 max demonstrates the marked ability of the horse to transfer O2 at each step in the O2 transport pathway.
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
September 1984,
Journal of applied physiology: respiratory, environmental and exercise physiology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1992,
Advances in experimental medicine and biology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
November 1982,
Journal of applied physiology: respiratory, environmental and exercise physiology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
October 1995,
The Journal of clinical investigation,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1969,
Pflugers Archiv : European journal of physiology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1963,
Le Poumon et le coeur,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1996,
European journal of applied physiology and occupational physiology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
August 1987,
The American journal of physiology,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1978,
Equine veterinary journal,
G L Landgren, and
J R Gillespie, and
M R Fedde, and
B W Jones, and
R L Pieschl, and
P D Wagner
January 1974,
Acta veterinaria Scandinavica. Supplementum,
