Impaired exercise ventilatory mechanics with the self-contained breathing apparatus are improved with heliox
- 257 Downloads
The effect of the self-contained breathing apparatus (SCBA) with compressed air (BA-A) on ventilatory mechanics, work of breathing (WOB), pulmonary function, and respiratory muscle fatigue, was compared with that of a low resistance breathing valve (LRV). Further, the effect of unloading the respiratory muscles with heliox with the SCBA (BA-H) was compared with BA-A and LRV. Twelve men completed three randomized exercise trials on separate days, each consisting of three 10 min bouts of stepping exercise (Bouts 1, 2, and 3) separated by a 5 min recovery. Subjects wore firefighter protective equipment including the SCBA. At rest, FEV1 and peak expiratory flow rates were lower with BA-A than with LRV, but were higher with BA-H than either with BA-A or LRV. After Bout 3, expiratory reserve volume, expiratory resistive WOB, and inspiratory elastic WOB were increased in BA-A compared to LRV but these were lower with BA-H compared to BA-A. After Bout 3, maximal inspiratory and expiratory pressures were reduced with BA-A, but not with LRV or BA-H. In summary, we found that the SCBA reduced resting pulmonary function, and increased expiratory reserve volume, work of breathing, and respiratory muscle fatigue during stepping exercise, and these changes can be reduced with the use of heliox.
KeywordsRespiratory muscle Breathing mechanics Muscle fatigue Aerobic exercise
Support for this work was provided by the Canadian Forces Fire Marshall, Department of National Defence.
- American Thoracic Society (1995) Standardization of spirometry. Am J Respir Crit Care Med 152:1107–1136Google Scholar
- Bygrave S, Legg SJ, Myers S, Llewellyn M (2004) Effect of backpack fit on lung function. Ergonomics 26:324–329Google Scholar
- Pellegrino R, Brusasco V, Rodarte JR, Babb TG (1993) Expiratory flow limitation and regulation of end-expiratory lung volume during exercise. J Appl Physiol 4:2552–2558Google Scholar
- Roussos C, Campbell EJM (1986) Respiratory muscle energetics. In: Handbook of physiology. The respiratory system. Mechanics of breathing. Am Physiol Soc, Bethesda, MD, sect 3, vol 3, pt 2, chap 28, pp 481–509Google Scholar
- West JB (2005) Respiratory physiology: the essentials, 7th edn. Lippincott Williams and Wilkins, PhiladelphiaGoogle Scholar