Cited by 80Phytochemicals and Medicinal PlantsSports Performance and TrainingExercise and Physiological Responses

Effects of an Aqueous Extract of Withania somnifera on Strength Training Adaptations and Recovery: The STAR Trial

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Ziegenfuss, Tim N., Kedia, Anurag W., Sandrock, Jennifer E., Raub, Betsy J., Kerksick, Chad M., Lopez, Hector L.·2018·Nutrients

Abstract

Withania somnifera (Ashwagandha) is an Ayurvedic herb categorized as having “rasayana” (rejuvenator), longevity, and revitalizing properties. Sensoril® is a standardized aqueous extract of the roots and leaves of Withania somnifera. Purpose: To examine the impact of Sensoril® supplementation on strength training adaptations. Methods: Recreationally active men (26.5 ± 6.4 years, 181 ± 6.8 cm, 86.9 ± 12.5 kg, 24.5 ± 6.6% fat) were randomized in a double-blind fashion to placebo (PLA, n = 19) or 500 mg/d Sensoril® (S500, n = 19). Body composition (DEXA), muscular strength, power, and endurance, 7.5 km cycling time trial, and clinical blood chemistries were measured at baseline and after 12 weeks of supplementation and training. Subjects were required to maintain their normal dietary habits and to follow a specific, progressive overload resistance-training program (4-day/week, upper body/lower body split). 2 × 2 mixed factorial ANOVA was used for analysis and statistical significance was set a priori at p ≤ 0.05. Results: Gains in 1-RM squat (S500: +19.1 ± 13.0 kg vs. PLA +10.0 ± 6.2 kg, p = 0.009) and bench press (S500: +12.8 ± 8.2 kg vs. PLA: +8.0 ± 6.0 kg, p = 0.048) were significantly greater in S500. Changes in DEXA-derived android/gynoid ratio (S500: +0.0 ± 0.14 vs. PLA: +0.09 ± 0.1, p = 0.03) also favored S500. No other between-group differences were found for body composition, visual analog scales for recovery and affect, or systemic hemodynamics, however, only the S500 group experienced statistically significant improvements in average squat power, peak bench press power, 7.5 km time trial performance, and perceived recovery scores. Clinical chemistry analysis indicated a slight polycythemia effect in PLA, with no other statistical or clinically relevant changes being noted. Conclusions: A 500 mg dose of an aqueous extract of Ashwagandha improves upper and lower-body strength, supports a favorable distribution of body mass, and was well tolerated clinically in recreationally active men over a 12-week resistance training and supplementation period.

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Authors
Ziegenfuss, T. N., Kedia, A. W., Sandrock, J. E., Raub, B. J., Kerksick, C. M., & Lopez, H. L.
Affiliations
  • The Center for Applied Health Sciences, 4302 Allen Road, Suite 120, Stow, OH 44224, USA
  • Lindenwood University (US)
Corresponding author
Ziegenfuss, Tim N.
Venue
Nutrients
Publisher
MDPI AG
Published
2018-11-20
Volume
10
Issue
11
Pages
1807
ISSN
2072-6643 (ISSN-L)
OpenAlex
W2900847340
Cited by
80
References
23
Citations by year
2026: 18 · 2025: 18 · 2024: 6 · 2023: 12 · 2022: 7 · 2021: 10 · 2020: 7 · 2019: 2
FWCI
6.52
Type
journal article
Language
en
Open access
Locations
  • Nutrients (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Natreon, Inc. (New Brunswick, NJ) (N/A)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Phytochemicals and Medicinal Plants
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
Withania somnifera, aqueous extract, resistance training, strength training adaptation, muscle strength, muscle power, endurance, body composition, post-exercise recovery, polycythemia, herbal supplementation, Rasayana, serum biochemistry, hemodynamics
MeSH terms
Adult, Body Composition, Double-Blind Method, Erythrocyte Count, Erythrocytes, Humans, Lipoproteins, LDL, Male, Physical Endurance, Placebos, Plant Extracts, Muscle, Skeletal, Dietary Supplements, Withania, Muscle Strength, Resistance Training, Young Adult, Sports Nutritional Physiological Phenomena

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