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CLA Supplementation and Aerobic Exercise Lower Blood Triacylglycerol, but Have No Effect on Peak Oxygen Uptake or Cardiorespiratory Fatigue Thresholds
Author(s) -
Jenkins Nathaniel D. M.,
Buckner Samuel L.,
Cochrane Kristen C.,
Bergstrom Haley C.,
Goldsmith Jacob A.,
Weir Joseph P.,
Housh Terry J.,
Cramer Joel T.
Publication year - 2014
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-014-3929-0
Subject(s) - respiratory compensation , sunflower oil , conjugated linoleic acid , vo2 max , medicine , aerobic exercise , chemistry , placebo , ventilatory threshold , endocrinology , hemoglobin , cholesterol , zoology , fatty acid , linoleic acid , anaerobic exercise , heart rate , biochemistry , blood pressure , physical therapy , biology , alternative medicine , pathology
This study examined the effects of 6 weeks of conjugated linoleic acid (CLA) supplementation and moderate aerobic exercise on peak oxygen uptake ( V ˙ O 2peak), the gas exchange threshold (GET), the respiratory compensation point (RCP), and serum concentrations of cholesterol, triacylglycerol, and glucose in humans. Thirty‐four untrained to moderately trained men (mean ± SD; age = 21.5 ± 2.8 years; mass = 77.2 ± 9.5 kg) completed this double‐blind, placebo controlled study and were randomly assigned to either a CLA (Clarinol A‐80; n = 18) or placebo (PLA; sunflower oil; n = 16) group. Prior to and following 6 weeks of aerobic training (50 %V ˙ O 2peak for 30 min, twice per week) and supplementation (5.63 g of total CLA isomers [of which 2.67 g was c9, t11 and 2.67 g was t10, c12] or 7.35 g high oleic sunflower oil per day), each participant completed an incremental cycle ergometer test to exhaustion to determine theirV ˙ O 2peak, GET, and RCP and fasted blood draws were performed to measure serum concentrations of cholesterol, triacylglycerol, and glucose. Serum triacylglycerol concentrations were lower ( p < 0.05) in the CLA than the PLA group. ForV ˙ O 2peak and glucose, there were group × time interactions ( p < 0.05), however, post hoc statistical tests did not reveal any differences ( p > 0.05) between the CLA and PLA groups. GET and RCP increased ( p < 0.05) from pre‐ to post‐training for both the CLA and PLA groups. Overall, these data suggested that CLA and aerobic exercise may have synergistic, blood triacylglycerol lowering effects, although CLA may be ineffective for enhancing aerobic exercise performance in conjunction with a 6‐week aerobic exercise training program in college‐age men.