Massage has been shown to reduce neuromuscular excitability by measuring changes in the Hoffman's reflex (H-reflex) amplitude. A decrease in peak-to-peak H-reflex amplitude suggests a decrease in motoneuron excitability. Others explain, "H-reflex is considered to be the electrical analogue of the stretch reflex...and the reduction" is due to a decrease in spinal reflex excitability. Field (2007) confirms that the inhibitory effects are due to deep tissue receptors and not superficial cutaneous receptors, as there was no decrease in H-reflex when looking at light fingertip pressure massage. It has been noted that "the receptors activated during massage are specific to the muscle being massaged", as other muscles did not produce a decrease in H-reflex amplitude.
No one really knows how a painful massage can also feel so good at the same time. This is a sensory phenomenon mostly beyond the reach of science — not entirely14 — all we can do is speculate. A main question is whether good pain is good because we expect relief to follow pain, or because positive and negative qualities are being produced simultaneously. My bet is on the latter.
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Research published in the Journal of Sports Medicine and Physical Fitness reported findings of a positive trend for deep tissue massages in regard to improved athletic recovery and performance. The most beneficial type of deep tissue massage for athletes is considered to be “sports massage,” which is commonly performed prior to athletic events to help warm the body and prevent injuries or immediately after to improve recovery.