TY - JOUR
T1 - Effect of specific inspiratory muscle warm-up on intense intermittent run to exhaustion
AU - TONG, Tom K K
AU - FU, Frank H K
N1 - Funding Information:
Ten healthy young males who were asymptomatic for cardiovascular or respiratory disease and engaged in regular various sports training (soccer, rugby, etc.) volunteered for the study (Table 1). After receiving explanations of the purposes and constraints of the study, and the potential benefits and risks involved in the exercise tests, subjects gave their written consent. This study was approved by the Committee on the Use of Human and Animal Subjects in Teaching and Research of Hong Kong Baptist University.
PY - 2006/8
Y1 - 2006/8
N2 - 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 (P0) and maximal rate of P0 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), δP0 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.
AB - 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 (P0) and maximal rate of P0 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), δP0 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.
KW - Breathlessness
KW - Dynamic muscle function
KW - Exercise performance
KW - Inspiratory flow
KW - Inspiratory mouth pressure
UR - http://www.scopus.com/inward/record.url?scp=33746606039&partnerID=8YFLogxK
U2 - 10.1007/s00421-006-0233-6
DO - 10.1007/s00421-006-0233-6
M3 - Journal article
C2 - 16770567
AN - SCOPUS:33746606039
SN - 1439-6319
VL - 97
SP - 673
EP - 680
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
IS - 6
ER -
