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Validity and reliability of skill-related fitness tests for wheelchair-using youth with Spina Bifida.

Bloemen, M.A., Takken, T., Backx, F.J., Vos, M., Kruitwagen, C.L., Groot, J.F. de. Validity and reliability of skill-related fitness tests for wheelchair-using youth with Spina Bifida. Archives of Physical Medicine and Rehabilitation: 2017, 98(6), p. 1097-1103.
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To determine content validity of the Muscle Power Sprint Test (MPST), and construct validity and reliability of the MPST, 10x5 Meter Sprint Test (10x5MST), slalom test, and One Stroke Push Test (1SPT) in wheelchair-using youth with spina bifida (SB).

Clinimetric study.

Rehabilitation centers, SB outpatient services, and private practices.

A convenience sample of children and adolescents (NZ53; 32 boys, 21 girls; age range, 5e19y) with SB who use a manual wheelchair.Participants were recruited through rehabilitation centers, SB outpatient services, pediatric physical therapists, and the BOSK (Association of Physically Disabled Persons and their Parents).

Not applicable.

Main Outcome Measures
Construct validity of the MPST was determined by comparing results with the arm-cranking Wingate Anaerobic Test
(WAnT) using paired t tests and Pearson correlation coefficients, while content validity was assessed using time-based for anaerobic testing. Construct validity of the 105MST, slalom test, and 1SPT was analyzed by hypothesis testing using Pearson correlation coefficients and multiple regression. For reliability, intraclass correlation coefficients (ICCs) and smallest detectable changes (SDCs) were calculated.

For the MPST, the mean SD exercise time of 4 sprints was 28.16.6 seconds. Correlations between the MPSTand arm-crankingWAnT were high (r>.72, P<.01). Excellent correlations were found between the 105MSTand slalom test (rZ.93, P<.01), while correlations between the 105MSTor slalom test and MPSTand 1SPTwere moderate (rZ.56 to.70; rZ.56, P<.01). The variation of the 1SPTwas explained for 38% by wheelchair mass (bZ.489) and total upper muscle strength (bZ.420). All ICCs were excellent (ICCs>.95), but the SDCs varied widely.

The MPST is a valid and reliable test in wheelchair-using youth with SB for measuring anaerobic performance. The 105MST and slalom test are valid and reliable for measuring agility. For the 1SPT, both validity and reliability are questionable. (aut. ref.)