This study published in the Journal of Sleep Research explores the relationship between sleep duration and serum brain-derived neurotrophic factor (BDNF) levels in adolescents at risk for type 2 diabetes (T2D). Conducted by Dutil et al., the research utilized a randomized crossover design to manipulate sleep duration in a sample of 36 adolescents, with a mean age of 15.1 years.
The participants were subjected to two different sleep conditions: an increased sleep duration (IN) and a decreased sleep duration (DE), each lasting one week and separated by a one-week washout period of habitual sleep. The manipulation aimed to assess the impact of sleep duration on serum BDNF levels, a protein associated with neuroplasticity and metabolic health.
During the study, the adolescents successfully adjusted their sleep duration, increasing it by an average of 1 hour and 2 minutes per night and decreasing it by 1 hour and 19 minutes per night compared to their habitual sleep duration of 7 hours and 31 minutes. The findings revealed that increasing sleep duration led to a significant decrease in serum BDNF levels by approximately 14% when compared to both the habitual and decreased sleep conditions.
Interestingly, no significant differences in BDNF levels were observed between the habitual and decreased sleep conditions. The authors suggest that the lower BDNF levels following sleep extension may indicate reduced physiological stress or compensatory neurotrophic signaling, although the exact mechanisms remain unclear. Conversely, the higher BDNF levels during habitual and restricted sleep may reflect adaptive responses to insufficient sleep rather than improvements in metabolic function.
What this study does not show
This study does not establish a causal relationship between sleep duration and improved metabolic health outcomes in adolescents, nor does it clarify the underlying mechanisms affecting BDNF levels.
Evidence scorecard
- Analytic validity: established
- Clinical validity: established
- Clinical utility: partial
The evidence class is human_rct, indicating a randomized controlled trial was conducted with human participants.