2.4. Visual-Analog Scales
BEST
100 mm anchored VAS were completed before acute ingestion of the investigational supplement and 1 and 2 h after ingestion of each acute supplement on testing visits 2–4. VAS were anchored with “Worst possible” or “Lowest possible” and “Best possible” or “Highest possible” and assessed subjective ratings of mood, ability to focus, mental clarity, ability to concentrate, ability to be productive, and ability to tolerate stress. The validity and reliability of VAS to assess similar constructs have been previously established [