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Training Volume

Training volume refers to the amount of physical work that can be conducted in one session, either by enhancing recovery between sets or increasing the amount of work performed in one set. Supplements that enhance training volume may improve gains from exercise.

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Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect training volume.
Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Supplement Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
Notes
grade-b Minor Very High See all 3 studies
There appears to be an increase in training volume (overall work performed during a workout) associated with caffeine ingestion relative to placebo, extending to both weightlifting and anaerobic cardiovascular exercise
grade-b Minor Moderate See all 10 studies
There might be an increase in work output conducted in tests that are anaerobic (high intensity) and associated with metabolic acidosis ('the burn') but may not extend to other contexts
grade-b - Very High See all 3 studies
No significant influence on training volume when used acutely

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