저항운동 경험이 적은 건강한 젊은 남성 57명을 대상으로 아슈와간다 뿌리 추출물의 근력·회복 효과를 본 8주 이중맹검 무작위 시험. 치료군(29명)은 아슈와간다 300 mg을 하루 2회, 대조군(28명)은 전분 위약유효 성분이 없는 가짜 약(플라시보). 효과 비교의 기준으로 쓴다.을 복용하며 8주간 저항운동을 했다. 주요 지표인 근력(1RM)에서 아슈와간다군이 벤치프레스(46.0 대 26.4 kg)와 레그익스텐션(14.5 대 9.8 kg)에서 더 크게 늘었고, 팔·가슴 근육 크기, 혈중 테스토스테론(+96.2 대 +18.0 ng/dL), 체지방 감소, 운동 유발 근손상 지표(크레아틴키나제) 안정화도 위약보다 유의하게 좋았다. 저자들은 아슈와간다 보충이 근육량·근력 증가와 연관되며 저항운동과 병행 시 유용할 수 있다고 결론지었다. 다만 초보자 대상 소규모 단일 시험이라 일반화에는 한계가 있다.
원문 초록 보기
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. ※ 파이프라인이 API로 수집·저장한 초록 원문 그대로. 한국어 핵심요약은 이 텍스트만을 근거로 작성됩니다.