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Respiratory and cardiac activity of killer whales

whaled III, MERRILL P. SPENCER, THOMAS A. GORNALL THOMAS C, POULTER VirgKu Mason Research Center, Seattle, Washington, Stanford &search In&u te, hfenlo Park, CalLfornid SPENCER, MERRIX,LP., THOMASA. GORNALLIII, THOMASC. POULTER. . J. Appl. Physiol. 22(5): 974-981. q67.-Orca in Puget Sound San Juan Isls usually surface every 4-5 min taking 2-5 breaths at 5-10 set intervals; z 2-min soundings were observed. A confined undisturbed 6.56 m, 3,4r4-kg male averaged periods 56.5 sec. A 4.27-m, r,ogo-kg female beached for flow curves, recorded from a calibrated “basket” pneumotachygraph, showed a tidal volume averaging 46.2 liters; expiration duration averaged 0.59 set, I 29 liters/set peak flow; inspiration, blowhole exped, 0.75 set, 90.2 liters/set. A suction-cup electrode attached to an electrocardiograph by insulated wires gave heart rates at 60 beats/min just before to 15 set after the blow, switching to 3o/min when submerged. Male female ECG’s disclosed no P wave, an inverted T wave, simple R wave. Phonations caused dilatation nasal sacs aside the blowhole. Male female sounds are distinctive. Phonation signals last 0.25-5 set, the fundamental from 340- 1,400 cycles/set with defined harmonics extending to at least 70 kc. The variations heart rate are discussed-in relationship to sinus tachycardia man. respiration ; http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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