> summary(emg.ph)

Simultaneous Tests for General Linear Hypotheses

Fit: lme4::lmer(formula = data ~ des_days * muscle + (muscle | ratID),
data = data_emg_trf, REML = FALSE, na.action = na.omit)

Linear Hypotheses:
                                       Estimate Std. Error z value Pr(>|z|)
des_days1 + des_days1:muscleVM == 0   -0.076243   0.009702  -7.859   <0.001 ***
des_days9 + des_days9:muscleVM == 0   -0.030596   0.011206  -2.730   0.0174 *
des_days45 + des_days45:muscleVM == 0  0.066351   0.009758   6.800   <0.001 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
(Adjusted p values reported -- single-step method)