This study aimed to assess the effects of single and multiple massage treatments on pressure-pain threshold (PPT) at myofascial trigger points (MTrPs) in people with myofascial pain syndrome expressed as tension-type headache.
Individuals (n = 62) with episodic or chronic tension-type headache were randomized to receive 12 twice-weekly 45-min massage or sham ultrasound sessions or wait-list control. Massage focused on trigger point release (ischemic compression) of MTrPs in the bilateral upper trapezius and suboccipital muscles. PPT was measured at MTrPs with a pressure algometer pre and post the first and final (12th) treatments.
PPT increased across the study timeframe in all four muscle sites tested for massage, but not sham ultrasound or wait-list groups (P < 0.0001 for suboccipital; P < 0.004 for upper trapezius). Post hoc analysis within the massage group showed (1) an initial, immediate increase in PPT (all P values < 0.05), (2) a cumulative and sustained increase in PPT over baseline (all P values < 0.05), and (3) an additional immediate increase in PPT at the final (12th) massage treatment (all P values < 0.05, except upper trapezius left, P = 0.17).
Single and multiple massage applications increase PPT at MTrPs. The pain threshold of MTrPs have a great capacity to increase; even after multiple massage treatments additional gain in PPT was observed.
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