correlational
Taking 3 grams of glycine before bed doesn't seem to change the overall structure of sleep stages, according to sleep monitoring equipment.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with unchanged sleep architecture in individuals with chronic sleep dissatisfaction, as measured by polysomnography.
Original Statement
“Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study uses 'without changes' which implies causation, but the study design (individual cohort study with unclear randomization and blinding) only supports associative language.
Evidence from Studies
No evidence studies found yet.