The effects of exercise on the GAP-43 expression in the spinal cord of arthritis-induced rats.
Soo-Jin Park, Nam-Jin Jung, Sang-Su Na
PMID 27821962WHAT IT FOUND
Treadmill exercise increased a spinal cord protein linked to nerve repair in rats with knee arthritis.
It does not show exercise reduces pain in people.
Key findings
01The exercise group had the highest GAP-43 expression among the groups.
02The no-exercise arthritis and exercise groups had significantly higher GAP-43 expression than the control group.
03The table reports GAP-43 expression of 22,986.4 ± 1239.6 pixels in the exercise group and 18,213.5 ± 603.3 pixels in the no-exercise arthritis group.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was done in rats, not people, so it does not show what exercise will do for a patient with knee osteoarthritis. The outcome measured was spinal cord GAP-43 staining area in pixels, not pain, walking ability, or patient-reported function. The authors interpret the higher GAP-43 expression as nerve cell recovery and possible pain relief, but the study did not measure pain relief directly. The paper does not report dropouts, deaths, or blinding of the outcome measurements, so the reliability of the group comparisons is unclear.
The easy way to misread this
Do not read the higher GAP-43 expression as evidence that exercise relieves osteoarthritis pain in people. The study measured spinal cord protein staining in rats, not patient pain or function.