Predictors of shuttle walking test performance in patients with cardiovascular disease

Abstract

Objective The incremental shuttle walking test (ISWT) is used to estimate cardiorespiratory fitness, but data from healthy individuals suggest that demographic and anthropometric measures account for much of the variance in test performance. The aim of this study was to determine whether anthropometric, demographic and selected gait measures also predict ISWT performance (i.e. distance walked) in patients with cardiovascular disease. Design Observational study. Setting A community-based cardiac rehabilitation centre (Cohort 1) and a hospital outpatient cardiac rehabilitation programme (Cohort 2). Participants Sixteen patients with clinically stable cardiovascular disease (Cohort 1) and 113 patients undergoing cardiac rehabilitation (Cohort 2). Interventions Patients in Cohort 1 performed the ISWT on two occasions. Anthropometric data and walking and turning variables were collected. Linear regression analyses were used to identify the predictors of test performance. The authors subsequently attempted to validate the equation created by comparing predicted and actual ISWT values in a larger (n = 113) validation sample (Cohort 2). Main outcome measures Distance walked during ISWT, step length and height. Results No gait or turning measures were significantly associated with ISWT performance. Distance walked correlated most strongly with step length (r = 0.83, P < 0.05) and height (r = 0.74, P < 0.05). Given the similarity of these correlations and the rarity of step length assessment in clinical practice, ISWT performance was predicted using patient's height; this explained 55% of the variance in ISWT performance. Height was also the best predictor in Cohort 2, explaining 17% of test variance (P < 0.01). Body mass index explained an additional 3% of variance (P < 0.05) in ISWT performance. Conclusions Routine clinical measures, particularly patient's height, are predictive of ISWT performance. The findings of the present study are in partial agreement with similar studies performed in healthy individuals, and it remains unclear whether the ISWT performance of patients with cardiovascular disease is influenced by the same factors as the ISWT performance of healthy individuals.

Effects of comprehensive cardiac rehabilitation on functional capacity and cardiovascular risk factors in Brazilians assisted by public health care: protocol for a randomized controlled trial

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Shuttle walking test in obese women: test‐retest reliability and concurrent validity with peak oxygen uptake

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Factors associating with shuttle walking test results in community-dwelling elderly people

“…The incremental shuttle walking test (SWT) was developed by Singh [5] to assess the endurance of patients with chronic obstructive pulmonary disease (COPD) [5] or chronic heart failure [6,7]. The SWT required subjects to walk back and forth along a 10-m flat course, with progressive increases in pace imposed by audio signals, until the subject was no longer able to maintain the pace [5].…”

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