Manon A. Bloemen, MSc; Tim Takken, PhD; Frank J. Backx, PhD; Marleen Vos, MSc; Cas L. Kruitwagen, MSc; Janke F. de Groot, PhD
Archives of Physical Medicine and Rehabilitation 2017;98:1097-103

Objectives: To determine content validity of the Muscle Power Sprint Test (MPST), and construct validity and reliability of the MPST, 105
Meter Sprint Test (105MST), slalom test, and One Stroke Push Test (1SPT) in wheelchair-using youth with spina bifida (SB).
Design: Clinimetric study.
Setting: Rehabilitation centers, SB outpatient services, and private practices.
Participants: 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).
Interventions: 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 criteria 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.
Results: 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.
Conclusions: 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.

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