Effect of dietary hempseed intake on cardiac ischemia-reperfusion injury

Am J Physiol Regul Integr Comp Physiol. 2007 Mar;292(3):R1198-203. doi: 10.1152/ajpregu.00661.2006. Epub 2006 Nov 22.


Polyunsaturated fatty acids (PUFAs) have significant, cardioprotective effects against ischemia. Hempseed contains a high proportion of the PUFAs linoleic acid (LA) and alpha-linolenic acid (ALA), which may have opposing effects on postischemic heart performance. There are no reported data concerning the cardiovascular effects of dietary hempseed intake. A group of 40 male Sprague-Dawley rats were distributed evenly into four groups that were fed for 12 wk a normal rat chow supplemented with hempseed (5% and 10%), palm oil (1%), or a 10% partially delipidated hempseed that served as a control. Plasma ALA and gamma-linolenic acid levels were significantly elevated in the rats that were fed a 5% or 10% hempseed-supplemented diet, but in heart tissue only ALA levels were significantly elevated in the rats fed these diets compared with control. After the dietary interventions were completed, postischemic heart performance was evaluated by measuring developed tension, resting tension, the rates of tension development and relaxation, and the number of extrasystoles. Hearts from rats fed a hempseed-supplemented diet exhibited significantly better postischemic recovery of maximal contractile function and enhanced rates of tension development and relaxation during reperfusion than hearts from the other groups. These hearts, however, were not protected from the occurrence of extrasystoles, nor were the increases in resting tension altered during ischemia or reperfusion as a function of any dietary intervention. Our data demonstrate that dietary hempseed can provide significant cardioprotective effects during postischemic reperfusion. This appears to be due to its highly enriched PUFA content.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Dietary Fats, Unsaturated / administration & dosage
  • Dietary Fats, Unsaturated / blood
  • Dietary Fats, Unsaturated / pharmacology*
  • Dietary Supplements*
  • Heart / drug effects*
  • Linoleic Acid / blood
  • Linoleic Acid / pharmacology
  • Male
  • Myocardial Reperfusion Injury* / metabolism
  • Myocardial Reperfusion Injury* / physiopathology
  • Myocardial Reperfusion Injury* / prevention & control
  • Myocardium / metabolism
  • Plant Oils / administration & dosage
  • Plant Oils / pharmacology*
  • Random Allocation
  • Rats
  • Rats, Sprague-Dawley
  • alpha-Linolenic Acid / blood
  • alpha-Linolenic Acid / pharmacology


  • Dietary Fats, Unsaturated
  • Plant Oils
  • alpha-Linolenic Acid
  • Linoleic Acid