Impaired exercise ventilatory mechanics with the self-contained breathing apparatus are improved with heliox.

Butcher, Scott J.; Jones, Richard L.; Mayne, Jonathan R.; Hartley, Timothy C.; Petersen, Stewart R.

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, FEV(1) 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.

BREATHING apparatus; ARTIFICIAL respiration; COMPRESSED air; MECHANICAL ventilators; RESPIRATION; RESPIRATORY muscles; AEROBIC exercises; ESOPHAGEAL physiology; RESPIRATORY muscle physiology; CHEST physiology; ATMOSPHERIC pressure; BODY temperature; COMPARATIVE studies; EXERCISE; EXERCISE tests; HEART beat; HELIUM; LUNG physiology; PROTECTIVE clothing; RESEARCH methodology; MEDICAL cooperation; MUSCLE strength; OXYGEN; RESEARCH; RESPIRATORY measurements; PULMONARY function tests; SPIROMETRY; EVALUATION research; RESPIRATORY mechanics; LUNG volume measurements; MUSCLE fatigue

European Journal of Applied Physiology, 2007, Vol 101, Issue 6, p659

1439-6319

Academic Journal

10.1007/s00421-007-0541-5