Influence of isocapnic hyperpnoea on maximal arm cranking performance |
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Authors: | Van Houtte Siska Verellen J Gosselink R Vanlandewijck Y C |
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Affiliation: | (1) Faculty of Physical Education and Physiotherapy, Department of Rehabilitation Sciences, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium;(2) Division Respiratory Rehabilitation, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium |
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Abstract: | Isocapnic hyperpnoea has been shown to reliably produce fatigue of the diaphragm. The aim of the present study was to investigate whether incremental isocapnic hyperpnoea (IHincr) impairs the arm exercise performance and alters the breathing pattern during subsequent maximal incremental arm cranking. Nine healthy volunteers performed an arm cranking test with prior IHincr (ACIH) and without prior IHincr (ACcontrol). Minute ventilation (V̇E), tidal volume (VT), breathing frequency (fb), O2 uptake ( O2), CO2 elimination ( CO2), respiratory exchange ratio (RER) and end-tidal partial pressure of CO2 (PETCO2) were measured at three different time intervals (t1: the average of the 3.30th min to the 6.30th min, t2: 1 min before the end, t3: peak value) and expressed as mean (SD). VT at t1 and at t3 was significantly (P<0.05) lower during ACIH [ACcontrol: t1: 1.3 (0.5) l, tp: 1.9 (0.3) l; ACIH: t1: 1.1 (0.3) l, tp: 1.6 (0.3) l]. fb at t1 and t2 was significantly (P<0.05) higher during ACIH [ACcontrol: t1: 23 (4) breaths min–1, t2: 42 (14) breaths min–1; ACIH: t1: 27 (5) breaths min–1, t2: 48 (14) breaths min–1]. The maximal voluntary ventilation (MVV), measured before and immediately after the IHincr, demonstrated a small but significant decrease from 157 (15) l min–1 to 150 (14) l min–1 (P<0.05) after the IHincr. In conclusion, rapid shallow breathing occurred during maximal arm cranking exercise after IHincr. The alteration was irrespective of the workload and had already occurred at the start of exercise. |
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Keywords: | Breathing pattern Exercise limitation Respiratory muscle fatigue Respiratory muscles Upper body exercise |
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