Fig. 3

Outcome measures. a Surface electromyography normalized to MVC; b Surface electromyography rest time (sEMG < 0.5 % of MVC); c Subjective pain intensity NRS; d Subjective perceived stress NRS. Models are adjusted for BMI, smoking, leisure time physical activity, trait anxiety (STAI-B), and preceding perceived stress (PSS). To illustrate group differences in absolute values, the models are plotted fitted to the mean baseline value of each group