This study published in 2019 is a small scale RCT that challenged healthy physically active female participants (n=11) with short term supplementation of a standardised Rhodiola rosea extract (3% rosavins, and 1% salidroside). Results indicated a statistically significant improvement in the mean power, peak power and anaerobic capacity.
Ballmann, C. G., Maze, S. B., Wells, A. C., Marshall, M. M., & Rogers, R. R. (2019). Effects of short-term Rhodiola Rosea (Golden Root Extract) supplementation on anaerobic exercise performance. Journal of Sports Sciences, 37(9), 998–1003. https://pubmed.ncbi.nlm.nih.gov/30371146/