Table 2 Mean change in 1-minute HRV metrics compared with the previous measurement time point (∆values = mean values current period – mean values previous period; n = 14).

From: Heart rate variability response of intensity-matched strength training dependent on body position in females: a pilot randomized crossover study

 

SM

50% 3-RM

LP

50% 3-RM

 

Effect size for interaction effects

Main effects (group, time, interaction)

∆ HRV metrics

  

p-value/post hoc-test

η²p

group

F value; p value

time

F value; p value

interaction

F value; p value

RRI in ms

∆ Exercise

∆ Afterload

∆ Rest

-157.1 ± 60.20

9.67 ± 34.95

135.6 ± 35.11

-189.5 ± 85.71

46.32 ± 30.67

151.0 ± 66.90

0.322

0.210

> 0.999

.203

F = 9.56;

p = .009

F = 108.8;

p < .001

F = 3.32;

p = .052

RMSSD in ms

∆ Exercise

∆ Afterload

∆ Rest

-1.19 ± 14.57

-3.37 ± 14.08

1.12 ± 8.92

-22.23 ± 22.46

0.52 ± 21.47

21.16 ± 18.96

0.013

> 0.999

0.018

0.424

F = 1.29;

p = .276

F = 6.46;

p = .005

F = 9.56;

p < .001

DFAa1

∆ Exercise

∆ Afterload

∆ Rest

-0.38 ± 0.34

-0.06 ± 0.23

0.42 ± 0.31

0.23 ± 0.31

-0.22 ± 0.29

-0.01 ± 0.20

< 0.001

0.769

0.013

0.541

F = 0.08;

p = .783

F = 8.16;

p = .001

F = 15.34;

p < .001

  1. The values are presented as the means and standard deviations, F = Effect size according to Cohen’s two-way repeated-measures ANOVA; η²p = partial eta square for interaction effect; ∆ Exercise (mean value Exercise T2/T5 – mean value Rest T1/T4), ∆ Afterload (mean value Afterload T3/T6 – mean value Exercise T2/T5), ∆ Rest (mean value Rest T4/T7 – mean value Afterload T3/T6); RRI = RR intervals, RMSSD = Root-Mean-Square-of-Successive-Differences, DFAa1: short-term scaling exponent alpha1 of Detrended Fluctuation Analysis.
  2. Significant values are in bold.