Cardiovascular function during treadmill exercise in the turkey.
1. Heart rate, arterial pressure and blood lactate levels were measured in turkeys over a range of running speeds on a treadmill. 2. Heart rates showed a hyperbolic increase with speed to a level approximately twice that recorded at rest. Arterial pressures were found to be lower than those previously reported for the turkey. During severe exercise, the mean value increased 37% above the resting level. 3. Blood lactate levels were greater at increased work loads, but after an initial rise, the levels remained steady during locomotion. 4. At rest, heart rate increased about 46% following parasympathetic blockade and decreased 19% with sympathetic blockade. During locomotion, parasympathetic tone is minimal. 5. In turkeys free of parasympathetic and beta-adrenergic influences, heart rate still increased at the highest running speed. Neither lactate nor ionotrophic effects appear to cause this increase.
D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001794:Blood Pressure / Q000187:drug effects; D005260:Female; D005426:Flight, Animal; D006339:Heart Rate / Q000187:drug effects; D007773:Lactates / Q000097:blood; D005082:Physical Exertion; D011188:Potassium / Q000097:blood; D011433:Propranolol / Q000494:pharmacology; D012964:Sodium / Q000097:blood; D014422:Turkeys / Q000502:physiology*
D007773:Lactates; D001285:Atropine; D012964:Sodium; D011433:Propranolol; D011188:Potassium