Possibly — but there are few reports. 88% of 17 people who reported on Pre-Workout for performance say it improved. 6% noticed no change and 6% say it got worse.
“Preworkout supplements increase my focus and wakefulness. They improve my workout performance A LOT.”
“I had a terribly tough time falling asleep. A couple times I couldn't sleep at all. I may be stimulant sensitive.”
“The pre-workout seemed to give me allot more physical endurance than the caffeine, and kept me motivated. As well helped me concentrate a surprising amount more than caffeine.”
“Cellucor C4 was the pre workout I started with and I absolutely loved it. It seriously increased the amount of power I felt I had.”
Conclusion: To avoid reductions in total sleep time, coffee (107 mg per 250 mL) should be consumed at least 8.8 h prior to bedtime and a standard serve of pre-workout supplement (217.5 mg) should be consumed at least 13.2 h prior to bedtime. The results of the present study provide evidence-based guidance for the appropriate consumption of caffeine to mitigate the deleterious effects on sleep.
Based on few reports — treat as anecdotal. Information only — not medical advice. How we count