causal
Taking 3 grams of glycine before bed doesn't change how much time people spend in different sleep stages (light sleep, deep sleep, REM sleep).
Scientific Claim
A single 3g dose of glycine before bedtime does not significantly alter sleep architecture (proportions of sleep stages) in adults with chronic poor sleep.
Original Statement
“The sleep architecture, that is, the ratios of each sleep stage length in the whole sleep period, was not altered by glycine ingestion (Fig. 5)”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The RCT design with objective PSG measurements and lack of statistical significance supports the claim that glycine does not alter sleep architecture. The study specifically measured this outcome and found no significant changes.
Evidence from Studies
Supporting (1)
0
Contradicting (0)
0
No contradicting evidence found