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KMID : 0361419930170030368
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Journal of Korean Academy of Rehabilitation Medicine
1993 Volume.17 No. 3 p.368 ~ p.383
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Effect of Physical Exercise on Plasma Beta-endorphin Level and Pain Threshold
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Abstract
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Plasma -β-endorphin is an endogenous opioid peptide that release from pituitary gland and may be increased in response to short-term vigorous exercise.
The present study was undertaken to define 1) the changes of plasma β-endorphin and pain threshold between baseline level and post-exercise level, 2) the correlation of plasma β-endorphin with pain threshold in healthy subjects(N=19). The
baseline
level was determined after rest for 30 minutes in a quiet room. The subjects also performed continuous exercise for 20 minutes on a bicycle ergometer with maintaining the target heart rate.
Pain thresholds was determined as measuring time(second) of first notice of pain sensation after immersion in cold water(0℃). The plasma β-endorphin levels were noted as significant increase in post-exercise(27.03±20.60pg/ml) as compared with
baseline level(14.67±11.96pg/ml)(p<0.01).
But there was no significant changes in pain threshold between baseline level(20.84±7.07 sec) and post-exercise level(23.00±7.93 sec) (P>0.05).
It is concluded that 1) physical exercise enhances release of β-endorphin but does not influence subiect's pain threshold, 2) plasma β-endorphin level does not show any correlation with subject's pain threshold.
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