Effects of exercise training and detraining on oxidized low-density lipoprotein-potentiated platelet function in men.

Abstract:

OBJECTIVE:To investigate how exercise training and detraining affect oxidized low-density lipoprotein (Ox-LDL)-potentiated platelet function in men. DESIGN:Cohort study. SETTING:Department of physical medicine and rehabilitation. PARTICIPANTS:Ten sedentary men (mean age +/- standard error of the mean, 21.6+/-0.2 y) who did not engage in any regular physical activity for at least 1 year before the study. INTERVENTIONS:Subjects cycled on an ergometer at about 50% of maximal oxygen consumption for 30 minutes daily, 5 days a week, for 8 weeks, then detrained for 12 weeks. MAIN OUTCOME MEASURES:During the experimental period, blood samples from the subjects were collected before and immediately after a progressive exercise test (ie, strenuous, acute exercise) every 4 weeks. The following measurements were taken when the subjects were at rest and immediately after exercise: plasma lipid profile, plasma Ox-LDL level, and platelet aggregation and intracellular calcium concentration ([Ca2+]i) elevation induced by adenosine disphosphate (ADP) alone or simultaneous ADP and Ox-LDL addition. RESULTS:Analytical results indicated that: (1) plasma total cholesterol and LDL levels were reduced after exercise training from 151+/-7 mg/dL and 58+/-2 mg/dL to 133+/-6 mg/dL and 46+/-2 mg/dL (P<.05), respectively, whereas the plasma Ox-LDL level remained unchanged; (2) platelet aggregation and [Ca2+]i elevation promoted by 100 microg/mL of Ox-LDL were significantly increased from 70%+/-5% and 91%+/-7% of resting level to 108%+/-4% and 125%+/-3% after strenuous, acute exercise (P<.05); (3) exercise training decreased resting and postexercise 100 microg/mL Ox-LDL-potentiated platelet aggregation (ie, 31%+/-4% and 82%+/-4%, respectively; P<.05) and [Ca2+]i elevation (ie, 35%+/-6% and 71%+/-4%, respectively; P<.05); (4) detraining reversed the training effects on lipid profile and platelet function; and (5) treating the platelet with L-arginine-inhibited Ox-LDL-potentiated platelet activation during the experimental period. CONCLUSIONS:Our results suggest that 8 weeks of exercise training decreased the plasma LDL level, but failed to influence production of plasma Ox-LDL. Importantly, resting and exercise-induced Ox-LDL-potentiated platelet activation was decreased by exercise training. However, this was reversed by detraining to the pretraining level.

journal_name

Arch Phys Med Rehabil

authors

Wang JS,Chow SE

doi

10.1016/j.apmr.2003.08.112

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

1531-7

issue

9

eissn

0003-9993

issn

1532-821X

pii

S0003-9993(04)00009-7

journal_volume

85

pub_type

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