Medical Hypotheses
Volume 51, Issue 6 , Pages 449-450, December 1998

The endogenous euphoric reward system that reinforces physical training: a mechanism for mankind's survival

5901 Montrose Road, #S408, Rockville, MD 20852, USA

Received 24 April 1997; accepted 12 June 1997.

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PII: S0306-9877(98)90064-0

Medical Hypotheses
Volume 51, Issue 6 , Pages 449-450, December 1998

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