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Table 1 Fixed and proportional bias in the Bland-Altman analysis

From: Validity of simplified, calibration-less exercise intensity measurement using resting heart rate during sleep: a method-comparison study with respiratory gas analysis

  %VO2R vs. %HRR based on Fixed bias Proportional bias
Mean difference 95% CI P Lower 95% CI Upper 95% CI difference vs. mean
LOA LOA r P
Treadmill testing with Bruce protocol HRsitting 10.8 8.8, 12.7 < 0.0001 −5.4 −13.4, 0.0 27.0 22.5, 35.0 −0.45 < 0.01
HRlying 7.7 5.4, 9.9 < 0.0001 −11.4 − 23.5, −4.9 26.8 20.3, 38.8 −0.18 0.14
HRsleeping 1.7 −0.2, 3.6 0.2552 −13.7 −25.3, −9.3 17.2 12.7, 25.3 0.24 0.06
Six minutes walking test HRsitting 12.7 10.0, 15.5 < 0.0001 −5.0 −16.0, 0.0 30.4 24.3, 41.4 0.00 0.98
HRlying 7.0 4.0, 10.0 < 0.0001 −11.6 −23.5, −5.0 25.6 18.9, 37.5 0.02 0.90
HRsleeping −2.9 −5.0, −0.7 0.0492 −16.3 − 24.6, −11.6 10.5 5.9, 18.9 0.26 0.11
  1. HR, heart rate; LOA, limit of agreement; CI, confidence interval; %VO2R, percent oxygen consumption reserve; %HRR, percent heart rate reserve, HRsitting; resting HR at sitting awake, HRsitting; resting HR at sitting awake, HRlying; resting HR at lying awake, HRsleeping; resting HR during sleeping