European Journal of Applied Physiology

, Volume 97, Issue 6, pp 673–680 | Cite as

Effect of specific inspiratory muscle warm-up on intense intermittent run to exhaustion

Original Article


The effects of inspiratory muscle (IM) warm-up on the maximum dynamic IM function and the maximum repetitions of 20-m shuttle run (Ex) in the Yo-Yo intermittent recovery test were examined. Ten men were recruited to perform identical IM function test and exercise test in three different trials randomly. The control trial was without IM warm-up while the placebo and experimental trials were with IM warm-up by performing two sets of 30 breaths with inspiratory pressure-threshold load equivalent to 15% (IMWP) and 40% (IMW) maximum inspiratory mouth pressure, respectively. In IMW, maximum dynamic IM functions including the maximal inspiratory pressure at zero flow (P 0) and maximal rate of P 0 development (MRPD) were increased compared with control values (P<0.05). The Ex was also augmented [mean (SD)] [19.5% (12.6)] while the slope of the linear relationship of the increase in rating of perceived breathlessness for every 4th exercise interval (RPB/4i) was reduced (P<0.05). In IMWP, although increase in Ex and reduction in RPB/4i were occurred concomitantly in some subjects, the differences in Ex, RPB/4i and dynamic IM functions between control and IMWP trials were not statistically significant. For the changes (Δ) in parameters in IMW and IMWP (n=20), negative correlations were found between Δ RPB/4i and Δ Ex (r=−0.92), ΔP 0 and Δ RPB/4i (r=−0.48), and Δ MRPD and Δ RPB/4i (r=−0.54). Such findings suggested that the specific IM warm-up in IMW may entail reduction in breathlessness sensation, partly attributable to the enhancement of dynamic IM functions, in subsequent exhaustive intermittent run and, in turn, improve the exercise tolerance.


Dynamic muscle function Inspiratory mouth pressure Inspiratory flow Breathlessness Exercise performance 



Our sincere thanks are extended to Binh Quach, Ellen K. Lu, Jin Lei Nie and Chuan Ye Huang for their valuable contributions to this project.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, NAB210, L2, David C. Lam Building Shaw CampusHong Kong Baptist University, Renfrew Road, Kowloon TongHong KongChina
  2. 2.Department of Physical EducationHong Kong Baptist UniversityHong KongChina

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