Criterion validation of two submaximal aerobic fitness tests, the self-monitoring Fox-walk test and the Åstrand cycle test in people with rheumatoid arthritis

BMC Musculoskeletal Disorders

Anette Rickenlund³  Christina H Opava¹  Wilhelmus Johannes Grooten⁴  Ted Österlund²  Eva Jansson²  Cecilia Fridén⁴  Birgitta Nordgren⁴ 

[1] Department of Rheumatology, Karolinska University Hospital, SE-171 77 Stockholm, Sweden;Division of Clinical Physiology C188, Department of Laboratory Medicine, Karolinska Institutet at Karolinska University Hospital, SE-141 86 Stockholm, Sweden;Division of Clinical Physiology N101, Department of Molecular Medicine and Surgery, Karolinska Institutet at Karolinska University Hospital, SE-171 76 Stockholm, Sweden;Division of Physiotherapy, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 23100, SE-141 83 Stockholm, Sweden

关键词: Peak oxygen uptake;    Maximal oxygen uptake;    Exercise;    Aerobic power;    Aerobic capacity;   

Others  :  1122105
DOI  :  10.1186/1471-2474-15-305

 received in 2014-05-14, accepted in 2014-08-28,  发布年份 2014

【 摘 要 】

Background

Aerobic capacity tests are important to evaluate exercise programs and to encourage individuals to have a physically active lifestyle. Submaximal tests, if proven valid and reliable could be used for estimation of maximal oxygen uptake (VO_2max). The purpose of the study was to examine the criterion-validity of the submaximal self-monitoring Fox-walk test and the submaximal Åstrand cycle test against a maximal cycle test in people with rheumatoid arthritis (RA). A secondary aim was to study the influence of different formulas for age predicted maximal heart rate when estimating VO_2max by the Åstrand test.

Methods

Twenty seven subjects (81% female), mean (SD) age 62 (8.1) years, diagnosed with RA since 17.9 (11.7) years, participated in the study. They performed the Fox-walk test (775 meters), the Åstrand test and the maximal cycle test (measured VO_2max test). Pearson’s correlation coefficients were calculated to determine the direction and strength of the association between the tests, and paired t-tests were used to test potential differences between the tests. Bland and Altman methods were used to assess whether there was any systematic disagreement between the submaximal tests and the maximal test.

Results

The correlation between the estimated and measured VO_2max values were strong and ranged between r = 0.52 and r = 0.82 including the use of different formulas for age predicted maximal heart rate, when estimating VO_2max by the Åstrand test. VO_2max was overestimated by 30% by the Fox-walk test and underestimated by 10% by the Åstrand test corrected for age. When the different formulas for age predicted maximal heart rate were used, the results showed that two formulas better predicted maximal heart rate and consequently a more precise estimation of VO_2max.

Conclusions

Despite the fact that the Fox-walk test overestimated VO_2max substantially, the test is a promising method for self-monitoring VO_2max and further development of the test is encouraged. The Åstrand test should be considered as highly valid and feasible and the two newly developed formulas for predicting maximal heart rate according to age are preferable to use when estimating VO_2max by the Åstrand test.

【 授权许可】

   
2014 Nordgren et al.; licensee BioMed Central Ltd.

【 图 表 】

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