Bottom line: Even if we take into
consideration that this "study has limitation with lack of maintenance
of
the dietary recall or training diary for all participants," the result
are an impressive argument in favor of CLA supplementation in athletes
in whom the previously mentioned negative effects on insulin response
capacity may not be physiologically relevant - if it occurs at all.
And still, Tsao et al. are right: "These findings suggest that CLA could
consider
as an effective ergogenic aid to improve the muscle
glycogen levels and endurance capacity. However, it
is necessary to monitor the whole-body glucose homeostasis to avoid
possible adverse effects of CLA [..] on glucose metabolism" (Tsao. 2014)
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References:
- Fariña, Ana C., et al. "Conjugated linoleic acid improves glucose
utilization in the soleus muscle of rats fed linoleic acid–enriched and
linoleic acid–deprived diets." Nutrition Research (2014). - Perez-Matute, P., et al. "Conjugated linoleic acid inhibits glucose
metabolism, leptin and adiponectin secretion in primary cultured rat
adipocytes." Molecular and cellular endocrinology 268.1 (2007): 50-58. - Ritsche, Kevin, et al. "Acute Exercise-Induced Growth Hormone is
Attenuated in Response to Short-Term, High-Intensity Exercise Training."
(2014). - Tsao, Jung-Piao, et al. "Oral conjugated linoleic acid
supplementation enhanced glycogen resynthesis in exercised human
skeletal muscle." Journal of sports sciences ahead-of-print (2014): 1-9.
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