Table 1 Descriptive statistics for HR and HRV indices in driving stages.

From: Heart rate dynamics for cognitive load estimation in a driving simulation task

Window

Metric

Stage

mean

std

25%

median

75%

30 s

Mean IBI

Urban

0.758

0.109

0.681

0.749

0.833

Highway

0.812

0.113

0.732

0.801

0.884

Urban + Nback

0.752

0.107

0.677

0.744

0.822

Highway + Nback

0.785

0.112

0.706

0.778

0.856

SDNN

Urban

0.034

0.018

0.023

0.031

0.042

Highway

0.033

0.019

0.021

0.030

0.042

Urban + Nback

0.033

0.019

0.021

0.029

0.040

Highway + Nback

0.030

0.019

0.019

0.026

0.036

RMSSD

Urban

0.027

0.021

0.013

0.022

0.033

Highway

0.030

0.023

0.015

0.025

0.037

Urban + Nback

0.026

0.024

0.013

0.020

0.032

Highway + Nback

0.027

0.024

0.014

0.022

0.033

HF

Urban

3.0E + 03

2.2E + 04

1.1E + 02

2.8E + 02

6.6E + 02

Highway

2.4E + 03

2.6E + 04

1.3E + 02

3.3E + 02

7.6E + 02

Urban + Nback

8.1E + 03

1.2E + 05

9.6E + 01

2.4E + 02

6.4E + 02

Highway + Nback

3.2E + 03

3.3E + 04

1.0E + 02

2.6E + 02

5.6E + 02

30 IBI

Mean IBI

Urban

0.756

0.109

0.680

0.748

0.829

Highway

0.812

0.113

0.732

0.801

0.882

Urban + Nback

0.750

0.108

0.676

0.743

0.819

Highway + Nback

0.784

0.111

0.705

0.776

0.855

PermEn

Urban

0.926

0.034

0.905

0.934

0.950

Highway

0.922

0.038

0.902

0.927

0.950

Urban + Nback

0.928

0.033

0.912

0.937

0.952

Highway + Nback

0.930

0.033

0.914

0.937

0.954

SampEn

Urban

1.326

0.277

1.253

1.386

1.504

Highway

1.397

0.236

1.304

1.386

1.609

Urban + Nback

1.324

0.292

1.253

1.386

1.504

Highway + Nback

1.421

0.228

1.386

1.386

1.609

100 s

Mean IBI

Urban

0.757

0.109

0.679

0.748

0.834

Highway

0.812

0.113

0.731

0.802

0.881

Urban + Nback

0.752

0.108

0.677

0.745

0.822

Highway + Nback

0.785

0.111

0.707

0.778

0.855

SDNN

Urban

0.054

0.047

0.031

0.044

0.061

Highway

0.044

0.040

0.026

0.037

0.052

Urban + Nback

0.054

0.081

0.028

0.039

0.057

Highway + Nback

0.041

0.051

0.024

0.033

0.046

RMSSD

Urban

0.047

0.067

0.016

0.027

0.051

Highway

0.040

0.054

0.017

0.027

0.043

Urban + Nback

0.050

0.114

0.015

0.025

0.045

Highway + Nback

0.038

0.073

0.015

0.024

0.037

LF

Urban

6.4E + 04

6.1E + 05

3.4E + 03

7.1E + 03

1.5E + 04

Highway

5.4E + 05

1.5E + 07

2.4E + 03

5.3E + 03

1.1E + 04

Urban + Nback

1.3E + 05

2.5E + 06

3.0E + 03

5.6E + 03

1.1E + 04

Highway + Nback

4.6E + 04

6.1E + 05

2.1E + 03

4.2E + 03

7.9E + 03

HF

Urban

1.6E + 05

1.8E + 06

1.6E + 03

4.5E + 03

1.5E + 04

Highway

2.1E + 06

6.1E + 07

1.7E + 03

4.4E + 03

1.1E + 04

Urban + Nback

1.2E + 05

1.2E + 06

1.3E + 03

3.4E + 03

1.2E + 04

Highway + Nback

7.4E + 04

7.5E + 05

1.3E + 03

3.3E + 03

7.6E + 03

LF/HF

Urban

2.002

1.952

0.678

1.454

2.727

Highway

1.643

1.619

0.648

1.208

2.064

Urban + Nback

1.979

1.815

0.671

1.500

2.637

Highway + Nback

1.565

1.358

0.656

1.249

2.078

90 IBI

Mean IBI

Urban

0.757

0.109

0.680

0.749

0.831

Highway

0.811

0.113

0.732

0.800

0.878

Urban + Nback

0.751

0.108

0.678

0.743

0.821

Highway + Nback

0.784

0.111

0.704

0.777

0.855

PermEn

Urban

0.948

0.032

0.931

0.955

0.971

Highway

0.941

0.037

0.922

0.947

0.968

Urban + Nback

0.950

0.031

0.935

0.956

0.974

Highway + Nback

0.950

0.032

0.933

0.955

0.974

SampEn

Urban

1.355

0.407

1.134

1.395

1.643

Highway

1.543

0.355

1.386

1.594

1.775

Urban + Nback

1.374

0.414

1.180

1.434

1.662

Highway + Nback

1.579

0.351

1.430

1.625

1.806

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