Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/9914
Title: No effect of arm exercise on diaphragmatic fatigue or ventilatory constraint in Paralympic athletes with cervical spinal cord injury
Authors: Taylor, BJ
West, CR
Romer, LM
Keywords: Neuromuscular disorder;Respiratory mechanics;Respiratory muscles;Quadriplegia;Upper body exercise
Issue Date: 2010
Publisher: American Physiological Society
Citation: Journal of Applied Physiology, 109:2, pp. 358 - 366, 2010
Abstract: Cervical spinal cord injury (CSCI) results in a decrease in the capacity of the lungs and chest wall for pressure, volume, and airflow generation. We asked whether such impairments might increase the potential for exercise-induced diaphragmatic fatigue and mechanical ventilatory constraint in this population. Seven Paralympic wheelchair rugby players (mean ± SD peak oxygen uptake = 16.9 ± 4.9 ml·kg–1·min–1) with traumatic CSCI (C5–C7) performed arm-crank exercise to the limit of tolerance at 90% of their predetermined peak work rate. Diaphragm function was assessed before and 15 and 30 min after exercise by measuring the twitch transdiaphragmatic pressure (Pdi,tw) response to bilateral anterolateral magnetic stimulation of the phrenic nerves. Ventilatory constraint was assessed by measuring the tidal flow volume responses to exercise in relation to the maximal flow volume envelope. Pdi,tw was not different from baseline at any time after exercise (unpotentiated Pdi,tw = 19.3 ± 5.6 cmH2O at baseline, 19.8 ± 5.0 cmH2O at 15 min after exercise, and 19.4 ± 5.7 cmH2O at 30 min after exercise; P = 0.16). During exercise, there was a sudden, sustained rise in operating lung volumes and an eightfold increase in the work of breathing. However, only two subjects showed expiratory flow limitation, and there was substantial capacity to increase both flow and volume (<50% of maximal breathing reserve). In conclusion, highly trained athletes with CSCI do not develop exercise-induced diaphragmatic fatigue and rarely reach mechanical ventilatory constraint.
URI: http://jap.physiology.org/content/109/2/358
http://bura.brunel.ac.uk/handle/2438/9914
DOI: http://dx.doi.org/10.1152/japplphysiol.00227.2010
metadata.dc.relation.isreplacedby: 2438/10133
http://bura.brunel.ac.uk/handle/2438/10133
ISSN: 8750-7587
Appears in Collections:Sport
Dept of Life Sciences Research Papers

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