Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation

Traditional understanding suggests that creatine supplementation only benefits cognitive performance after weeks of consistent dietary intake due to limited uptake by the central nervous system (CNS). This study investigated whether a high single dose of creatine could bypass this limitation and provide acute protection against the metabolic and cognitive impairments caused by 21 hours of sleep deprivation (SD).

Researchers conducted a randomized, double-blind, placebo-controlled cross-over trial with 15 healthy subjects. Participants underwent two sessions of 21-hour sleep deprivation, receiving either a high single dose of creatine monohydrate (0.35 g/kg) or a placebo. The team used 31P-MRS and 1H-MRS to monitor cerebral high-energy phosphates (such as PCr, ATP, and Pi) and pH levels at multiple time points. Cognitive performance was assessed using a battery of tests, including the Psychomotor Vigilance Test (PVT), word memory, and digit span tasks.

Creatine administration significantly improved cognitive performance and processing speed compared to the placebo group during sleep deprivation. Metabolically, creatine prevented the SD-induced drop in pH levels and induced favorable changes in the PCr/Pi ratio and ATP levels. These effects were detectable as early as 3.5 hours post-ingestion and persisted for up to 9 hours. The results suggest that the combination of sleep deprivation and cognitive demand may trigger a temporary increase in creatine uptake, allowing for a rapid neuroprotective effect.

These findings challenge the dogma that creatine requires long-term loading to affect brain metabolism. By demonstrating that a single high dose can mitigate the cognitive deterioration associated with sleep loss, this research opens new possibilities for using creatine as an acute intervention for individuals facing unavoidable sleep deprivation, such as shift workers or emergency personnel.