Lauren Noto Bell, DO, published "The Effects of Post-Isometric Relaxation on Ankle Plantar Flexion and Timed Flutter Kick in Pediatric Competitive Swimmers" in the Journal of the American Osteopathic Association.
The article can be found at De Gruyter.
Swimmers with restricted range of motion in the ankle showed a statistically significant increase in ankle motion after being treated with muscle energy osteopathic manipulative treatment (OMT).
