ISSN 2326-7267
International Journal of Pharmacy and Pharmacology ISSN: 2326-7267 Vol. 8 (11), pp. 001-006, November, 2019. © International Scholars Journals
Full Length Research Paper
Effect of alpha-lipoic acid and time- of-day on interleukin-6 response to exhaustive exercise in humans
Zekine Lappalainen
School of Physical Education and Sports, Balikesir University, Turkey. E-mail: [email protected]. Tel: +90-266-2391838. Fax: +90-266-2390285.
Accepted 14 April, 2019
Abstract
Circadian rhythms have an influence on human performance. Interleukin-6 is a cytokine which plays a role in muscle energy homeostasis during physical exercise. This study tested the effect of diurnal variation and alpha-lipoic acid, a natural thiol antioxidant, on skeletal muscle contractile properties, interleukin-6 response and oxidative damage. Male subjects (n=26) performed isokinetic exercise in different time-of-day. Next, the subjects were supplemented with alpha-lipoic acid for two weeks and the exercise tests were repeated. Blood samples were analyzed at baseline and immediately after exercise. Leg extensor muscle parameters were compared with time-of-day. Maximal work per single repetition and total work values were higher in the afternoon time, suggesting a time-of-day effect. Serum interleukin-6 levels increased in response to exercise, but were not associated with time-of-day. Alpha-lipoic acid did not have a significant effect on any of the measured parameters. Diurnal variations during exhaustive eccentric exercise seem to reflect muscle contractile work capacity. Exercise increases serum interleukin-6 levels irrespective of diurnal variation.
Key words: Diurnal variation, lipoic acid, interleukin-6, muscle performance.