Measuring physical fitness in Persons with Severe/Profound ...

participant had fulfilled the task. This was drawn out using a 100 mm Visual Analogue Scale (VAS)[23, 24]. Zero corresponded to no motivation and 100 to the best possible motivation.Estimated peak heart rateSeveral researchers have found that the HR peakfor people with ID systematically differs fromthe HR peakof people without ID [25,26]. Therefore, Fernhall et al. developed an equation to moreaccurately predict HR peakfor people with ID [13]. The estimated HR peakusing the Fernhall formula[13] was calculated for each participant before testing.Data AnalysisAll statistical analyses were performed using the Statistical Package for Social Studies (SPSS)version 16.0 for Windows. All data was checked for normal distribution and homoscedasticity bystatistical analysis. Homoscedasticity was defined as no relation between the error and the size ofthe measured value [27]. A p-value of < 0.05 indicated statistical significance for all tests.FeasibilityThe GXT and the SMBT were tested for feasibility. The percentage of the participants that finishedthe test successfully determined feasibility. Interpretation of the feasibility scores was taken fromthe Groningen fitness test for the elderly [28]. A 95% score meant “good” feasibility and an 80%score meant “sufficient” feasibility [28].Test-retest reliabilityThe Intraclass Correlation Coefficient (ICC) (two-way random, absolute agreement) was calculatedfor HR peakand for the attained GXT1 and GXT2 levels. An ICC