Eicosanoid Production following One Bout of Exercise in Middle-Aged African American Pre- and Stage 1 Hypertensives

الملخص EN

Endothelial dysfunction and a sedentary lifestyle may be involved in the development of hypertension which is proliferative among middle-aged African Americans (AA).

Signaling molecules derived from the oxidation of 20-carbon fatty acid molecules known as eicosanoids influence vascular tone.

The relationship between aerobic fitness and eicosanoid formation following exercise in middle-aged African American hypertensives is unknown.

Purpose.

To determine the relationship between aerobic capacity and eicosanoid formation after a bout of moderate-intensity exercise in middle-aged AA hypertensives.

Methods.

Ten sedentary hypertensive AA underwent 50 min of aerobic exercise at 65% VO2max.

Urine was collected for 24 hr on two occasions, prior to testing and immediately following the bout of exercise.

Urinary metabolites of prostacyclin (6-keto PGF1α) and thromboxane (11-dTXB2) were measured during the day and night periods by high-performance liquid chromatography (HPLC).

Results.

6-keto PGF1α levels significantly increased (P=.04) following the bout of exercise compared to the control day.

There was a significant relationship (r=.49, P<.05) between 6-keto PGF1α levels and VO2max during the exercise day.

Conclusion.

Based on this preliminary study, there appears to be a relationship between aerobic capacity and exercise-induced 6-keto PGF1α production in middle-aged hypertensive AAs.

AAs with lower VO2max had lower 6-keto PGF1α formation.