Fig 1.
Study protocols for all experiments.
Fig 2.
Mean scores of root mean square of successive differences (RMSSD). Scores during different stimulation intensities at three time measurement points. Error bars represent confidence intervals (95%).
Table 1.
Descriptive statistics for Experiments 1, 2 and 3.
Mean scores and standard deviations for the root mean square of successive differences (RMSSD) and median values for perceived stimulation intensity and unpleasantness.
Table 2.
Results of repeated measures analysis of variance for the root mean square of successive differences (RMSSD), with Bayesian analysis (B10) as well as post hoc tests for time measurement and for the subjective variables (Experiment 1).
Fig 3.
Mean scores of root mean square of successive differences (RMSSD). Scores during different stimulation methods at three time measurement points. Error bars represent confidence intervals (95%).
Table 3.
Results of repeated measures analysis of variance for the root mean square of successive differences (RMSSD), with Bayesian analysis (B10), post hoc tests for time measurement and t-tests for the subjective variables (Experiment 2).
Fig 4.
Mean scores of root mean square of successive differences (RMSSD). Scores during (a) different stimulation conditions as well as (b) different stimulation methods at three time measurement points. Error bars represent confidence intervals (95%).
Table 4.
Results of repeated-measures analysis of variance for the root mean square of successive differences (RMSSD), with Bayesian analysis (B10) as well as post hoc tests for time measurement and for the subjective variables (Experiment 3).