Studies, like this 1992 study, have shown that muscle fatigue can be delayed by boosting glutathione levels.
James T, Drummond JT, Sha H, Blumenthal RM, Matthews RG
The most important active constituents of schisandra include: schizandrin deoxyschizandrin schisanheno schizandrol sesquicarene citral stigmasterol antioxidants, including vitamins C and E Schisandra is a complex herb, and there are multiple mechanisms by which these constituents might act like phytoadaptogens, affecting the central nervous, sympathetic, endocrine, immune, respiratory, cardiovascular and gastrointestinal systems
Those are the downstream signs of reduced GH pulse amplitude
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