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Respiratory pattern changes during costovertebral joint movement

changes during movement College of Medicine, University of South Florida, Costovertebral joint manipulation (CVJM). Experiments were performed on 10 dogs (7-12 kg) anesthetized intravenously with diallylbarbituric acid (Dial) with urethane (0.5 ml/kg) paralyzed with gallamine triethiodide (Flaxedil) . Ventilation was artificially maintained with a respirator via a tracheal cannula end-tidal CO2 was maintained between 5 6%. Oxygen (100%) was administered via the respirator to eliminate hypoxemia due to the open chest. Rectal temperature was maintained at 37.5 t 05°C by a hot-water heating pad. costovertebral joint mechanoreceptors; phrenic nerve discharge; respiratory timing; dogs; chest compression; lung inflaArterial blood pressure was also monitored to ensure that tion deflation the animals were in a stable condition during the studies. The animals were placed in a prone position in a stereotaxic head holder spinal frame with T1 T7 IT IS WELL KNOWN that joint mechanoreceptors are im- vertebra fixed by clamps. portant for the perception of movement posture. It Routine surgical procedures included tracheal cannuis also known that passive limb movement increases the lation, catheterization of a femoral artery vein, respiratory rate that joint receptors have been shown isolation sectioning of the cervical vagus nerves, to contribute to the response (2,4, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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