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Figure 3. Bland and Altman plot demonstrating the limits of agreement (±1.96). Bias was not significantly different from zero. Bias 0.3 %±6.5 %. Figure 4. Bland and Altman plot demonstrating the limits of agreement (±1.96). Bias was not significantly different from zero. Bias 1.5 %±2.1 %.
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The results of this study showed poor reliability of exercises with the ball as suggested by the low ICC (from 0.38 to 0.72) with 95% of HR differences within ± 6.5 % to±14.2 % of HRmax. On the contrary, the circuit track HR performed without the ball used in the present investigation showed a higher reliability with ICCs ranging from 0.83 to 0.90 (from moderate to high) with total error for HR within ±2.1% and±2.5% of HRmax.