Method ological factors affecting 6MWD include track length , encouragement , supplemental oxygen and walking aids .
Supplemental oxygen also affects ISWT and ESWT performance .
Responsiveness was moderate to high for all tests , with greater responsiveness to interventions that included exercise training .
The findings of this review demonstrate that the 6MWT , ISWT and ESWT are robust tests of functional exercise capacity in adults with chronic respiratory disease
This systematic review examined the measurement properties of the 6-min walk test ( 6MWT ) , incremental shuttle walk test ( ISWT ) and endurance shuttle walk test ( ESWT ) in adults with chronic respiratory disease .
Heart rate recovery after 6-min walk test predicts survival in patients with idiopathic pulmonary fibrosis.
BACKGROUND In patients with idiopathic pulmonary fibrosis ( IPF ) , our objectives were to identify predictors of abnormal heart rate recovery ( HRR ) at 1 min after completion of a 6-min walk test ( 6MWT ) [ HRR1 ] and 2 min after completion of a 6MWT ( HRR2 ) , and to determine whether abnormal HRR predicts mortality . METHODS From 2003 to 2008 , we identified IPF patients who had been evaluated at our center ( n = 76 ) with a pulmonary physiologic examination and the 6MWT .  We used logistic regression to identify predictors of abnormal HRR , the product-limit method to compare survival in the sample stratified on HRR , and Cox proportional hazards analysis to estimate the prognostic capability of abnormal HRR . RESULTS Cutoff values were 13 beats for abnormal HRR1 and 22 beats for HRR2 . In a multivariable model , predictors of abnormal HRR1 were diffusing capacity of the lung for carbon monoxide ( odds ratio [ OR ] , 0.4 per 10 % predicted ; 95 % confidence interval [ CI ] , 0.2 to 0.7 ; p = 0.003 ) , change in heart rate from baseline to maximum ( OR , 0.9 ; 95 % CI , 0.8 to 0.97 ; p = 0.01 ) , and having a right ventricular systolic pressure > 35 mm Hg as determined by transthoracic echocardiogram ( OR , 12.7 ; 95 % CI , 2.0 to 79.7 ; p = 0.01 ) . Subjects with an abnormal HRR had significantly worse survival than subjects with a normal HRR ( for HRR1 , p = 0.0007 [ log-rank test ] ; for HRR2 , p = 0.03 [ log-rank test ] ) ; these results held for the subgroup of 30 subjects without resting pulmonary hypertension ( HRR1 , p = 0.04 [ log-rank test ] ) . Among several c and i date variables , abnormal HRR1 appeared to be the most potent predictor of mortality ( hazard ratio , 5.2 ; 95 % CI , 1.8 to 15.2 ; p = 0.004 ) . CONCLUSION Abnormal HRR after 6MWT predicts mortality in IPF patients . Research is needed to confirm these findings prospect ively and to examine the mechanisms of HRR in IPF patients
Method ological factors affecting 6MWD include track length , encouragement , supplemental oxygen and walking aids .
Supplemental oxygen also affects ISWT and ESWT performance .
Responsiveness was moderate to high for all tests , with greater responsiveness to interventions that included exercise training .
The findings of this review demonstrate that the 6MWT , ISWT and ESWT are robust tests of functional exercise capacity in adults with chronic respiratory disease
This systematic review examined the measurement properties of the 6-min walk test ( 6MWT ) , incremental shuttle walk test ( ISWT ) and endurance shuttle walk test ( ESWT ) in adults with chronic respiratory disease .