Shilajit May Help Maintain Muscle Strength During Exercise
Shilajit is a mineral exudate from the Himalayas that has been used for centuries by practitioners of Ayurvedic medicine to boost energy and revitalize the body. A new study has found that Shilajit may help maintain muscle strength for longer during exercise.
Sixty-three recreationally active men participated in the study. The participants were divided into three equal groups and took either a low dose of Shilajit (250 mg per day), a high dose of Shilajit (500 mg per day), or a placebo for eight weeks. At baseline and at the end of the study the participants performed tests to measure concentric peak torque, fatigue-induced percent decline in strength, and tests of maximum voluntary isometric contraction (MVIC) strength. The participants were further divided based on their MVIC strength at baseline. The researchers also measured levels of serum hydroxyproline (HYP).
Participants in the high dose group and in the top 50thpercentile of MVIC strength at baseline had a decline in MVIC strength of only 8.9% at the end of the study period. The top 50thpercentile in the low dose group had a 17% decline in MVIC strength, and the placebo group had a 16% decline. The researchers state that this suggests that the high dose group was more resistant to fatigue and retained a greater level of maximal muscle strength.
In addition, HYP levels were significantly lower in the top 50thpercentile of the high dose group, compared to the low dose and placebo groups. HYP is often used as an indirect biomarker of collagen degradation and the integrity of connective tissue following high-intensity exercise.
The study was conducted by researchers from the University of Nebraska-Lincoln. It was published February 6, 2019 in the Journal of the International Society of Sports Nutrition.