Excellent journals always publish excellent science!
If this is what you believe, you might want to read a study of chiropractic just published in the highly respected SCIENTIFIC REPORTS.
The objective of this study was to investigate whether a single session of chiropractic care could increase strength in weak plantar flexor muscles in chronic stroke patients. Maximum voluntary contractions (strength) of the plantar flexors, soleus evoked V-waves (cortical drive), and H-reflexes were recorded in 12 chronic stroke patients, with plantar flexor muscle weakness, using a randomized controlled crossover design. Outcomes were assessed pre and post a chiropractic care intervention and a passive movement control. Repeated measures ANOVA was used to asses within and between group differences. Significance was set at p < 0.05. Following the chiropractic care intervention there was a significant increase in strength (F (1,11) = 14.49, p = 0.002; avg 64.2 ± 77.7%) and V-wave/Mmax ratio (F(1,11) = 9.67, p = 0.009; avg 54.0 ± 65.2%) compared to the control intervention. There was a significant strength decrease of 26.4 ± 15.5% (p = 0.001) after the control intervention. There were no other significant differences. Plantar flexor muscle strength increased in chronic stroke patients after a single session of chiropractic care. An increase in V-wave amplitude combined with no significant changes in H-reflex parameters suggests this increased strength is likely modulated at a supraspinal level. Further research is required to investigate the longer term and potential functional effects of chiropractic care in stroke recovery.
In the article we find the following further statements (quotes in bold, followed by my comments in normal print):
- Data were collected by a team of researchers from the Centre for Chiropractic Research at the New Zealand College of Chiropractic. These researchers can be assumed to be highly motivated in generating a positive finding.
- The entire spine and both sacroiliac joints were assessed for vertebral subluxations, and chiropractic adjustments were given where deemed necessary, by a New Zealand registered chiropractor. As there is now near-general agreement that such subluxations are a myth, the researchers treated a non-existing entity.
- The chiropractor did not contact on a segment deemed to be subluxated during the control set-up and no adjustive thrusts were applied during any control intervention. The patients therefore were clearly able to tell the difference between real and control treatments. Participants were not checked for blinding success.
- Maximum isometric plantarflexion force was measured using an isometric strain gauge. Such measurements crucially depend on the motivation of the patient.
- The grant proposal for this study was reviewed by the Australian Spinal Research Foundation to support facilitation of funding from the United Chiropractic Association. Does this not mean the researchers had a conflict of interest?
- The authors declare no competing interests. Really? They were ardent subluxationists supported by the United Chiropractic Association, an organisation stating that chiropractic is concerned with the preservation and restoration of health, and focuses particular attention on the subluxation, and subscribes to to the obsolete concept of vitalism: we ascribe to the idea that all living organisms are sustained by an innate intelligence, which is both different from and greater than physical and chemical forces. Further, we believe innate intelligence is an expression of universal intelligence.
So, in essence, what we have here is an under-powered study sponsored by vitalists and conducted by subluxationists treating a mythical entity with dubious interventions without controlling for patients’ expectation pretending their false-positive findings are meaningful.
I cannot help wondering what possessed the SCIENTIFIC REPORTS to publish such poor science.