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Korean J Physiol Pharmacol. 2014 Oct;18(5):441-6. doi: 10.4196/kjpp.2014.18.5.441. Epub 2014 Oct 17.

Ursolic Acid-induced elevation of serum irisin augments muscle strength during resistance training in men.

Author information

1
Division of Humanities and Social Science, POSTECH, Pohang 790-784, Korea.
2
Department of Physiology, College of Medicine, Cardiovascular and Metabolic Disease Center, Inje University, Busan 614-735, Korea.
3
Department of Physical Education, Tongmyong University, Busan 608-711, Korea.
4
Department of Physical Education, Pukyong University, Busan 608-737, Korea.
5
Division of Sport Science, Pusan National University, Busan 609-735, Korea.
6
Department of Nutrition, Food and Exercise Sciences, Florida State University, Tallahassee FL 32306, USA.

Abstract

Ursolic acid (UA), a type of pentacyclic triterpenoid carboxylic acid purified from natural plants, can promote skeletal muscle development. We measured the effect of resistance training (RT) with/without UA on skeletal muscle development and related factors in men. Sixteen healthy male participants (age, 29.37±5.14 years; body mass index=27.13±2.16 kg/m(2)) were randomly assigned to RT (n=7) or RT with UA (RT+UA, n=9) groups. Both groups completed 8 weeks of intervention consisting of 5 sets of 26 exercises, with 10~15 repetitions at 60~80% of 1 repetition maximum and a 60~90-s rest interval between sets, performed 6 times/week. UA or placebo was orally ingested as 1 capsule 3 times/day for 8 weeks. The following factors were measured pre-and post-intervention: body composition, insulin, insulin-like growth factor-1 (IGF-1), irisin, and skeletal muscle strength. Body fat percentage was significantly decreased (p<0.001) in the RT+UA group, despite body weight, body mass index, lean body mass, glucose, and insulin levels remaining unchanged. IGF-1 and irisin were significantly increased compared with baseline levels in the RT+UA group (p<0.05). Maximal right and left extension (p<0.01), right flexion (p<0.05), and left flexion (p<0.001) were significantly increased compared with baseline levels in the RT+UA group. These findings suggest that UA-induced elevation of serum irisin may be useful as an agent for the enhancement of skeletal muscle strength during RT.

KEYWORDS:

IGF-1; Irisin; Muscle strength; Resistance training; Ursolic acid

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