ABSTRACT
INTRODUCTION: Myofascial trigger point therapy (MTrP) is a widely used therapeutic approach, although the underlying mechanisms remain unclear. Mechanisms discussed include peripheral involvement of muscles as well as central pain modulating processes such as the conditioned pain modulation (CPM). The aim of this study was to investigate whether the analgesic response of MTrP and the analgesic response of CPM correlate in asymptomatic participants in order to identify shared underlying mechanisms of MTrP and CPM. METHOD: Both, CPM and MTrP protocols consisted of heat-based test stimuli (heat pain thresholds before and after the intervention) and pressure-based (conditioning) stimuli. Asymptomatic participants (n = 94) were randomly assigned to receive either mild, intense or no pressure stimuli (between-group design) to both the fingernail and the MTrP of the infraspinatus muscle (within-group design). Pressure stimuli at both locations (fingernail, MTrP) were applied with a pressure algometer for 120 s and continuously adjusted to maintain a constant pain intensity of mild or intense pain. All thermal stimuli were applied on the lower leg with a thermal stimulator. RESULTS: A significant correlation was shown between the analgesic effect of CPM and MTrP therapy for mild (r = 0.53, p = 0.002) and intensive stimuli (r = 0.73, p < 0.001). 17.3% of the variance of the MTrP effect were explained by CPM after mild stimulation, and 47.1% after intense stimulation. Pain-related characteristics did not explain the variance within the analgesic response using a regression analysis. CONCLUSIONS: Between the analgesic responses following MTrP and CPM paradigms, a moderate to strong correlation was observed, suggesting shared underlying mechanisms.
Subject(s)
Myofascial Pain Syndromes , Pain Threshold , Trigger Points , Humans , Female , Male , Trigger Points/physiopathology , Adult , Pain Threshold/physiology , Myofascial Pain Syndromes/therapy , Young Adult , Pain Measurement , Therapy, Soft Tissue/methods , Pressure , Pain Management/methods , Hot TemperatureABSTRACT
Tendinopathy of the mid-portion of the Achilles tendon is common in athletes and non-athletes. From a physiotherapeutic view, calf muscle training is the most recommended kind of treatment. However, there is no current systematic review evaluating the efficacy of physiotherapy in due consideration of the entire spectrum of therapeutic options. A systematic review of the literature in several databases and journals revealed 19 relevant studies. Good evidence was found for eccentric training compared to no therapy, satisfactory evidence for eccentric training compared to concentric training, satisfactory to good evidence for the same effect by using eccentric training and heavy slow resistance training, poor evidence for the same effect by using eccentric training and stretching, and poor to good evidence that eccentric training may have the same effect as several therapies applied by physicians. The Alfredson protocol and heavy slow resistance training may be the most recommendable types of calf muscle training. There is no high-quality evidence for the efficacy of other hands off or hands on treatment options.
