Effectiveness of inspiratory muscle training on endurance running performance in recreational runners

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Effectiveness of inspiratory muscle training on endurance running performance in recreational runners

 

Author: Kwok, Man-kit Thomas
Title: Effectiveness of inspiratory muscle training on endurance running performance in recreational runners
Degree: M.Sc.
Year: 2008
Subject: Hong Kong Polytechnic University -- Dissertations.
Respiratory muscles.
Running -- Physiological aspects.
Department: Dept. of Rehabilitation Sciences
Pages: xv, 84 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2174190
URI: http://theses.lib.polyu.edu.hk/handle/200/2842
Abstract: The purpose of the present study was to determine the effect of inspiratory muscle training on endurance running performance in recreational runners. Sixteen recreational runners were randomly assigned into either Intervention (INT) or Control (CON) groups. INT group (n = 8) received inspiratory muscle training. CON group (n = 8) acted as control and performed shoulder circumduction exercise. The intervention period was six weeks. Assessments of maximal inspiratory muscle strength (Pimax), pulmonary function (FVC and FEV1), maximal aerobic capacity (VOamax) endurance running performance [(time to complete 1500 meters (T1500) and maximal rate of perceived exertion (MRPE)] were performed for all subjects before and after the 6-week intervention period. Subjects were advised to maintain their usual running habits throughout the intervention period. Subjects in INT group utilized the training apparatus that composed of a DHD inspiratory muscle trainer and Hudson RCI Lung Volume Exerciser for training of inspiratory muscle strength. They breathed against the training apparatus for 30 inspiratory efforts twice daily for 6 weeks. Training resistance was at 80% Pimax for the first 2 weeks and then increased to 90% Pimax for the remaining 4 weeks. Subjects in CON group performed the shoulder circumduction exercise for 30 repetitions twice daily for 6 weeks. After the intervention period, there was significant improvement in Pimax, T1500 and MRPE in INT group (p < 0.05) compared to CON group. However, there was no significant change in FVC, FEVi and VOamax in both groups. Further analysis using General Linear Model - Multivariate analysis of covariance (GLM-MANCOVA) showed that, after adjusting for covariates such as running habits and baseline T1500 and MPRE, intervention (Group) demonstrated a significantly improved final T1500 and MPRE scores compared to the control group. In other words, after adjusting the covariates, INT group completed the final 1500m time trial earlier with lower rate of perceived exertion than the CON group (p < 0.05). The results suggested that a 6-week inspiratory muscle training program enhanced endurance running performance in recreational runners but have no effect on their pulmonary function or maximal aerobic capacity.

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