Effect of cervical spine manipulation on muscle strength: a randomized clinical trial

This randomized clinical trial evaluated the immediate effect of cervical spine manipulation on the maximal isometric strength of shoulder abductors. A total of 26 subjects participated where 13 subjects were randomized into the intervention group (joint manipulation of the cervical spine), and 13 subjects to the placebo group (simulated manipulation of the cervical spine). The maximum isometric strength of shoulder abductors was evaluated pre and post intervention using a dynamometer (E-lastic). According to a paired t-test analysis, no significant change in muscle strength was found between pre and post intervention for both groups. This study demonstrated that a single cervical spine manipulation does not produce immediate effects on the maximal isometric strength of shoulder abductors.