Jenkins Nathaniel D M, Buckner Samuel L, Baker Robert B, Bergstrom Haley C, Cochrane Kristen C, Weir Joseph P, Housh Terry J, Cramer Joel T
1Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska; and 2Department of Health, Sport, and Exercise Sciences, University of Kansas, Lawrence, Kansas.
J Strength Cond Res. 2014 Aug;28(8):2127-35. doi: 10.1519/JSC.0000000000000513.
The purpose of this study was to examine the effects of conjugated linoleic acid (CLA) supplementation in conjunction with 6 weeks of aerobic exercise training on the physical working capacity at the fatigue threshold (PWCFT), timed sit-ups, and the standing long jump. Thirty-three untrained to moderately trained men (mean ± SD; age = 21.6 ± 2.8 years) participated in this double-blind, placebo-controlled study and were randomly assigned to either a CLA (Clarinol A-80; n = 17) or placebo (PLA; sunflower oil; n = 16) group. Before and after 6 weeks of aerobic training (50% VO2peak for 30 minutes, twice per week) and supplementation (8 ml CLA or PLA per day), each subject completed an incremental cycle ergometer test to exhaustion to determine the PWCFT, maximal number of sit-ups in 1 minute, and the standing long jump. There were no differences (all p ≥ 0.23) between the CLA and PLA groups for the analysis of covariance-adjusted posttest mean values for PWCFT, sit-ups, or standing long jump. The PWCFT increased from pre- to posttraining in the CLA (p = 0.003) and PLA (p = 0.003) groups. There were no differences (p > 0.05) from pre- to posttraining for sit-ups and standing long jump in either the CLA or PLA groups. There was no effect of CLA on the training-induced increases in PWCFT, nor were there any effects of CLA or aerobic training on the maximum number of sit-ups or standing long jump. Thus, CLA had no ergogenic benefits on this model of aerobic training-induced improvements in neuromuscular fatigue, or on field tests of muscle endurance and power.
本研究的目的是检验补充共轭亚油酸（CLA）并结合6周有氧运动训练对疲劳阈值时的身体工作能力（PWCFT）、定时仰卧起坐和立定跳远的影响。33名未经训练至中度训练的男性（均值±标准差；年龄 = 21.6 ± 2.8岁）参与了这项双盲、安慰剂对照研究，并被随机分配到CLA组（Clarinol A - 80；n = 17）或安慰剂组（PLA；向日葵油；n = 16）。在进行6周有氧运动训练（每周两次，每次30分钟，强度为50% VO2峰值）和补充剂（每天8毫升CLA或PLA）前后，每位受试者完成递增式自行车测力计测试直至 exhaustion，以确定PWCFT、1分钟内仰卧起坐的最大次数和立定跳远。对于PWCFT、仰卧起坐或立定跳远，CLA组和PLA组在协方差调整后的测试后均值分析中没有差异（所有p≥0.23）。CLA组（p = 0.003）和PLA组（p = 0.003）的PWCFT从训练前到训练后均有所增加。CLA组和PLA组在训练前后的仰卧起坐和立定跳远方面均无差异（p>0.05）。CLA对训练诱导的PWCFT增加没有影响，CLA或有氧运动训练对仰卧起坐或立定跳远的最大次数也没有任何影响。因此，CLA对这种有氧运动训练诱导的神经肌肉疲劳改善模型，或对肌肉耐力和力量的实地测试没有促力作用。
