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passages: Subjective and objective levels of physical activity and their association with cardiorespiratory fitness in rheumatoid arthritis patients . INTRODUCTION The aims of the present study were : ( a ) to examine the agreement between subjective ( assessed via the International Physical Activity Questionnaire ; IPAQ ) and objective ( accelerometry ; GT3X ) physical activity ( PA ) levels in patients with rheumatoid arthritis ( RA ) , and ( b ) to evaluate the associations of RA patients ' subjective and objective PA to their scores on the maximal oxygen uptake test ( VO2max ) . METHODS The participants wore the GT3X for seven days before completing the IPAQ and VO2max test . The Bland-Altman plot was used to illustrate the agreement between the objective and subjective PA data , and the Wilcoxon test was employed to examine the differences . The association between the PA measurement and VO2max test was examined via the correlations and the magnitude was presented by the Steiger 's Z value . RESULTS Sixty-eight RA patients ( age=55±13 years , body mass index : 27.8±5.4 kg/m2 , median of disease duration=5 ( 2-8 ) yrs ) were recruited . Smaller differences between the subjective and objective measures were found when PA was assessed at the moderate level . Wilcoxon tests revealed that patients reported less time spent engaged in sedentary behaviours ( Z=-6.80 , P < 0.01 ) and light PA ( Z=-6.89 , P < 0.01 ) and more moderate PA ( Z=-6.26 , P < 0.01 ) than was objectively indicated . Significant positive correlations were revealed between VO2max with all PA levels derived from accelerometry ( light PA rho=.35 , P < .01 ; moderate PA rho=.34 , P=.01 ; moderate and vigorous PA , ( MVPA ) rho=.33 , P=.01 ) , and a negative association to sedentary time ( ST ) emerged ( rho=-.27 , P=.04 ) . IPAQ-reported moderate PA and MVPA positively correlated with maxV02 ( rho=.25 , P=.01 , rho=.27 , P=.01 , respectively ) . Differences between the magnitude of correlations between the IPAQ-VO2 max and GT3X-VO2 max were only significant for ST ( Z=3.43 , P < .01 ) . CONCLUSIONS Via responses to the IPAQ , RA patients reported that they were less sedentary and engaged in more higher intensity PA than what was objectively assessed . Accelerometry data correlated with VO2max at all PA levels . Only subjective moderate and MPVA correlated with VO2max . Findings suggest that self-reported PA and ST should be interpreted with caution in people with RA and complemented with accelerometry when possible . TRIAL REGISTRATION Trial registration : ClinicalTrials.gov ISRCTN04121489 . Registered 5 September 2012 .
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entities: Intervention_Physical
entities: PA
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entities: Outcome_Physical
entities: International Physical Activity Questionnaire ; IPAQ )
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entities: GT3X ) physical activity ( PA )
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entities: maximal oxygen uptake test ( VO2max )
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entities: IPAQ
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entities: VO2max
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entities: PA measurement
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entities: VO2max
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entities: PA
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entities: sedentary behaviours
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entities: light PA
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entities: VO2max
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entities: PA levels
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entities: sedentary time
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entities: IPAQ-reported
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entities: PA
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entities: MVPA
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entities: IPAQ-VO2 max
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entities: GT3X-VO2 max
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entities: Participant_Condition
entities: rheumatoid arthritis patients .
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entities: patients with rheumatoid arthritis ( RA )
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entities: Participant_Sample-size
entities: Sixty-eight
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entities: RA
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entities: Participant_Age
entities: age=55±13 years