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Effects of Alpha-Lipoic Acid Supplementation in Peripheral Arterial Disease: A Pilot Study

Objective: To examine whether 3 months of lipoic acid (LA) supplementation improved walking tolerance and delayed claudication pain onset in peripheral arterial disease (PAD).

Design: Randomized, double-blind, controlled study.

Setting: General Clinical Research Center.

Subjects: Twenty-eight (28) participants (15 men, 13 women) with PAD (ankle brachial index range 0.9–0.4, mean age 73.2 ± 1.6 years).

Intervention: LA (600 mg/day) or placebo for 3 months.

Outcome measures: Walking tolerance was assessed by 6-minute walk test distance, 4-meter walk time, initial claudication pain time (ICT) and distance (ICD), and peak claudication pain. Serum was assessed for inflammation (C-reactive protein [CRP]) and oxidative stress (lipid hydroperoxides) as potential mechanisms for changes in walking tolerance.

Results: ICT increased 34.4% and 15%, ICD was reduced by 40.5% and 18%, and peak claudication pain ratings were reduced by 93% and 7% in LA and placebo groups, respectively. Although the improvements in peak pain and ICT achieved significance within the LA group (both p < 0.05), the interactions of group by time were not found to be significant (p > 0.05). Oxidative stress and CRP measures were not different between groups by month 3 (p > 0.05). There were no serious side-effects associated with the LA.

Published on 08-18-2008
Authors: Heather K. Vincent, Cheryl M. Bourguignon, Kevin R. Vincent, Ann G. Taylor
Source: The Journal of Alternative and Complementary Medicine