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Determinants of cardiorespiratory fitness in patients with chronic obstructive pulmonary disease, focusing on activities parallel to daily living
Author(s) -
NAKAMURA Yoichi,
TANAKA Kiyoji,
SHIGEMATSU Ryosuke,
HOMMA Toshiaki,
SEKIZAWA Kiyohisa
Publication year - 2004
Publication title -
respirology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 85
eISSN - 1440-1843
pISSN - 1323-7799
DOI - 10.1111/j.1440-1843.2004.00605.x
Subject(s) - cardiorespiratory fitness , medicine , copd , physical strength , cardiology , physical therapy , vo2 max , vital capacity , pulmonary function testing , physical fitness , squat , physical medicine and rehabilitation , heart rate , blood pressure , lung function , lung , diffusing capacity
Objective: The purpose of this study was to examine whether activities parallel to daily living (APDL) constitute a determinant index of cardiorespiratory fitness in patients with chronic obstructive pulmonary disease (COPD). Methodology: Four functional physical fitness parameters were investigated in 38 male patients (mean age 69.8 ± 6.7 years) with moderate to severe COPD. The parameters measured were muscular strength (grip strength), muscular endurance strength (arm curl, keeping a half‐squat position) and regulation (walking around two cones). In addition, cardiorespiratory fitness was measured using a 6‐min walking distance test (6MWD) and peak oxygen uptake (VO 2peak ) was measured during bicycle ergometer testing. Maximal inspiratory pressure (MIP) and maximal expiratory pressure were measured so as to quantify respiratory muscle strength. Results: There were significant correlations ( P < 0.05) between the VO 2peak , muscular endurance, pulmonary function and respiratory muscle strength. There were also significant correlations of VO 2peak to muscular endurance, muscular strength, muscular endurance strength and regulation. In stepwise multiple regression analysis, per cent predicted forced expiratory volume in 1 s and MIP appeared to be significant determinants of VO 2peak , showing a total variance of 56% ( P < 0.05). For the 6MWD, the significant determinants were forced vital capacity, MIP and performance in the half‐squat test, showing a variance of 59% ( P < 0.05). Conclusion: The results suggest that cardiorespiratory fitness is strongly affected by MIP, pulmonary function and muscular endurance strength, as APDL depend on lower‐limb use.