Chiropractic is a therapy that has been in search for an indication ever since it was invented some 120 years ago. So far, this search seems to have been unsuccessful.
Perhaps it could be promoted as a means of enhancing athletic performance?
That would be excellent news for chiropractic cash-flow!
The authors of this study wanted to analyse the acute effects of spinal manipulative therapy (SMT) on performance and autonomic modulation. A total of 37 male recreational athletes who had never received SMT were assigned to a sham (n = 19) or actual SMT group (n = 18). Study endpoints included autonomic modulation (heart rate variability), handgrip strength, jumping ability and cycling performance (8-minute time trial [TT]). Differences in custom effects between interventions were determined using magnitude-based inferences.
A significant and very likely lower value of a marker of sympathetic modulation, the stress score, was observed in response to actual compared to sham SMT (p = 0.007; effect size [ES] = -0.97). A trend towards a significant and likely lower sympathetic:parasympathetic ratio (p = 0.055; ES = -0.96) and a likely higher natural logarithm of the root-mean-square differences of successive heartbeat intervals ([LnRMSSD], p = 0.12; ES = 0.36) was also found with actual SMT. Moreover, a significantly lower mean power output was observed during the TT with actual compared with sham SMT (p = 0.035; ES = -0.28). Non-significant (p > 0.05) and unclear or likely trivial differences (ES < 0.2) were found for the rest of endpoints, including handgrip strength, heart rate during the TT, and jump loss thereafter.
A single pre-exercise SMT session induced an acute shift towards parasympathetic dominance and slightly impaired performance in recreational healthy athletes.
The search was unsuccessful yet again!
SMT impaired performance; this might not convince athletes to become fans of chiropractic.
What indication should the desperate chiros try next?