Hormonal
Late-afternoon resistance training elicits greater hypertrophy and strength adaptations than morning training due to a higher exercise-induced testosterone response, despite higher baseline morning testosterone levels.
If your goal is maximizing muscle growth and strength, schedule your heavy resistance training sessions for the late afternoon (e.g., 4 PM - 8 PM). While your testosterone is naturally higher in the morning, your body's hormonal response to the stress of lifting weights is significantly greater in the late afternoon, leading to better long-term gains. Avoid morning training if you can, as high morning cortisol may blunt the anabolic benefits of morning testosterone.
Although T levels are higher in the morning, an increased resistance exercise–induced T response has been found in the late afternoon, suggesting greater responsiveness of the hypothalamo-pituitary-testicular axis then. ... individuals may experience greater hypertrophy and strength gains when resistance training protocols are designed dependent on individual T response.
Why this rating
This is a review article synthesizing multiple studies; it cites evidence but does not present a single primary clinical trial itself.
Source
INTERACTIONS OF CORTISOL, TESTOSTERONE, AND RESISTANCE TRAINING: INFLUENCE OF CIRCADIAN RHYTHMS
Lawrence D. Hayes et al. · Chronobiology International · 2010
DOI 10.3109/07420521003778773
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- Late-afternoon physical performance (strength, power, flexibility) is generally superior to morning performance due to increased core body temperature enhancing peripheral mechanisms like nerve conduction and blood flow.Good
- Repeated morning resistance training can blunt the typical diurnal variation in strength performance, effectively increasing morning strength to match afternoon levels.Moderate
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