“Data demonstrate increased strength and power performance for swearing v. not swearing but the absence of cardiovascular or autonomic nervous system effects makes it unclear whether these results are due to an alteration of sympathovagal balance or an unknown mechanism.”
See: Effect of swearing on strength and power performance
Notes:
[1] “WARNING: This paper contains language that some readers may find offensive.”
[2] Scope for further research : as yet, the experiments haven’t investigated whether some swearwords might work better than others.