Table 2 Agreement between HRVs from radar and those from ECG.

From: Noncontact assessment for fatigue based on heart rate variability using IR-UWB radar

Phase

Linear model

Correlation

ICC

Bland–Altman plot

β/C*

Pearson’s R (p value)

ICCR

95% CI

Mean bias

p value for mean bias

Upper 95% LOA

Lower 95% LOA

Rest (T0)

0.91/0.16

0.816 (0.002)

0.807

0.527–0.930

0.062 (− 0.060–0.188)

0.249

0.46

− 0.33

Fatigue 1 (T1)

− 0.18/1.12

0.779 (0.006)

0.712

0.345–0.892

0.232 (− 0.142–0.607)

0.159

1.41

− 1.95

Fatigue 2 (T2)

0.52/0.82

0.781 (0.005)

0.741

0.399–0.904

0.177 (− 0.034–0.388)

0.064

0.84

− 0.49

Recovery (T3)

0.55/0.62

0.783 (0.004)

0.764

0.442–0.913

− 0.078 (− 0.267–0.110)

0.336

0.51

− 0.67

  1. *Beta coefficient and intercept of the linear models.
  2. ICC Intraclass correlation coefficient, LOA Limit of agreement, HRV Heart rate variability, ECG Electrocardiography.
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