Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Randomized Controlled Trial
. 2015 Nov 25;12:43.
doi: 10.1186/s12970-015-0104-9. eCollection 2015.

Examining the Effect of Withania Somnifera Supplementation on Muscle Strength and Recovery: A Randomized Controlled Trial

Affiliations
Free PMC article
Randomized Controlled Trial

Examining the Effect of Withania Somnifera Supplementation on Muscle Strength and Recovery: A Randomized Controlled Trial

Sachin Wankhede et al. J Int Soc Sports Nutr. .
Free PMC article

Abstract

Background: Withania somnifera (ashwagandha) is a prominent herb in Ayurveda. This study was conducted to examine the possible effects of ashwagandha root extract consumption on muscle mass and strength in healthy young men engaged in resistance training.

Methods: In this 8-week, randomized, prospective, double-blind, placebo-controlled clinical study, 57 young male subjects (18-50 years old) with little experience in resistance training were randomized into treatment (29 subjects) and placebo (28 subjects) groups. Subjects in the treatment group consumed 300 mg of ashwagandha root extract twice daily, while the control group consumed starch placebos. Following baseline measurements, both groups of subjects underwent resistance training for 8 weeks and measurements were repeated at the end of week 8. The primary efficacy measure was muscle strength. The secondary efficacy measures were muscle size, body composition, serum testosterone levels and muscle recovery. Muscle strength was evaluated using the 1-RM load for the bench press and leg extension exercises. Muscle recovery was evaluated by using serum creatine kinase level as a marker of muscle injury from the effects of exercise.

Results: Compared to the placebo subjects, the group treated with ashwagandha had significantly greater increases in muscle strength on the bench-press exercise (Placebo: 26.4 kg, 95% CI, 19.5, 33.3 vs. Ashwagandha: 46.0 kg, 95% CI 36.6, 55.5; p = 0.001) and the leg-extension exercise (Placebo: 9.8 kg, 95% CI, 7.2,12.3 vs. Ashwagandha: 14.5 kg, 95 % CI, 10.8,18.2; p = 0.04), and significantly greater muscle size increase at the arms (Placebo: 5.3 cm(2), 95% CI, 3.3,7.2 vs. Ashwagandha: 8.6 cm(2), 95% CI, 6.9,10.8; p = 0.01) and chest (Placebo: 1.4 cm, 95% CI, 0.8, 2.0 vs. Ashwagandha: 3.3 cm, 95% CI, 2.6, 4.1; p < 0.001). Compared to the placebo subjects, the subjects receiving ashwagandha also had significantly greater reduction of exercise-induced muscle damage as indicated by the stabilization of serum creatine kinase (Placebo: 1307.5 U/L, 95% CI, 1202.8, 1412.1, vs. Ashwagandha: 1462.6 U/L, 95% CI, 1366.2, 1559.1; p = 0.03), significantly greater increase in testosterone level (Placebo: 18.0 ng/dL, 95% CI, -15.8, 51.8 vs. Ashwagandha: 96.2 ng/dL, 95% CI, 54.7, 137.5; p = 0.004), and a significantly greater decrease in body fat percentage (Placebo: 1.5%, 95% CI, 0.4%, 2.6% vs. Ashwagandha: 3.5%, 95% CI, 2.0%, 4.9%; p = 0.03).

Conclusion: This study reports that ashwagandha supplementation is associated with significant increases in muscle mass and strength and suggests that ashwagandha supplementation may be useful in conjunction with a resistance training program.

Keywords: Adaptogen herbs; Ashwagandha; Body fat; Creatine kinase; Muscle; Muscle mass; Muscle strength; Testosterone.

Figures

Fig. 1
Fig. 1
CONSORT schematic diagram
Fig. 2
Fig. 2
The effect of Ashwagandha treatment in muscle strength [a bench press 1 RM, b leg extension 1RM] and muscle size in c thigh, d arm and e Chest
Fig. 3
Fig. 3
The effect of Ashwagandha treatment in a serum testosterone and b serum creatine kinase level

Similar articles

See all similar articles

Cited by 12 articles

See all "Cited by" articles

References

    1. Williamson EM, et al. Major Herbs of Ayurveda. London: Churchill Livingstone; 2002.
    1. Kapoor LD. CRC Handbook of ayurvedic medicinal plants. Carbohydr: Boca Raton, Florida; 1990.
    1. Upton R. Ashwagandha Root: Withania Somnifera: Analytical, Quality Control, and Therapeutic Monograph. Santa Cruz, California: American Herbal Pharmacopoeia; 2000.
    1. Mishra LC, Singh BB, Dagenais S. Scientific basis for the therapeutic use of Withania somnifera (ashwagandha): a review. Alternative Medicine Review. 2000;5:334–346. - PubMed
    1. Vyas VK, Bhandari P, Patidar R. A Comprehensive Review on Withania somnifera Dunal. J Nat Remedies. 2011;11:1–13. doi: 10.1038/nature10493. - DOI

Publication types

Substances

LinkOut - more resources

Feedback