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

Table 3. Test–retest reliability of HR peakand levels achievedHR peakGXT1–HR peakGXT2(n=26)HR peakGXT–HR peakSMBT(n=20)HR peakGXT1–HR peakcalculated(n=26)HR peakGXT2–HR peakcalculated(n=26)HR peakSMBT–HR peakcalculated(n=20)HR peakGXT1–HR peakGXT2(n=26)LOA% of mean-16 to 1419.5%-17 to 1520.5%-45 to 1335.8%-43 to 1334.5%-42 to 1434.1%-3.4 to 2.943.4%ICC(95%CI)0.95(0.88-0.98)0.94(0.86 – 0.98)0.28(-0.23 – 0.62)0.39(-0.21 – 0.72)0.36(-0.25- 0.72)0.95(0.90-0.98)t-test -0.6(p=0.5)-0.3(p=0.7)-5.4(p=0.001)-5.3(p=0.001)-4.6(p=0.001)-0.6(p=0.56)SEM 5 5 8 9 8 1SDD 6 6 8 8 8 2ES 0.12 0.07 0.73 0.73 0.73 0.12HR: heart rate; GXT: graded exercise test; LOA: Limits of Agreement; ICC: Intraclass Correlation Coefficient; SEM:Standard Error of Measurement SEM=SDx√(1-ICC)[27]; SDD: Smallest Detectable Difference SDD=1,96x√(2xSEM)[27]; ES: Effect Size; ES=√{t 2 /(t 2 +df)} [32]ValidityTwenty participants performed the SMBT, according to criterion A. The ICC (ICC=0.94; 95%CI0.86-0.98) between the HR peakSMBT and the corresponding HR peakGXT was very good (Table3). The t-test (p=0.7) revealed no significant differences between the HR peakof the SMBT andthe HR peakof the corresponding GXT (Table 3). The LOA results range from -17 to 15. The LOArepresents 20.5% of the mean (157 beats/min) (Figure 3). ).Eleven persons met the criterion of a maximal performance on the GXT, because the heartrate of the SMBT differed by not more than two beats from the HRpeak reached during thecorresponding GXT. In four persons HRpeak SMBT was more than two beats more than HRpeakGXT, which means they did not meet the criterion of a maximal performance on the GXT. In fivepersons HRpeak SMBT was less than HRpeak GXT.Chapter 5 | 79