Level of alpha amylase activity in human saliva as a non-invasive biochemical marker of sleep deprivation
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To investigate the usefulness of the enzyme salivary alpha amylase as a biochemical marker of sleep deprivation in human subjects. Total 168 healthy school-going adolescents studying in 9th grade were selected randomly from morning shift (n = 84) and dayshift (n = 84) schools. The study was undertaken longitudinally for a period of 2 years. Study encompassed administration of questionnaire and collection of saliva samples from the participants. Activity of salivary alpha amylase (sAA) activity was estimated spectrophotometrically and statistical analysis was performed to determine the association between sAA activity and sleep duration. Excessive daytime sleepiness among students was also studied in association with sAA activity. sAA activity of students was found to have a negative correlation with the duration of sleep and a positive correlation with their level of sleepiness. Morning shift students were found to have significantly less sleep and correspondingly higher sAA activity as compared to dayshift students. A significant increase in the sAA activity was noticed in the second year as the students progressed from 9th to 10th grade. Higher amylase activity was also observed in sleep deprived students suffering from excessive daytime sleepiness irrespective of school timings. Salivary alpha amylase activity increases in saliva in response to sleep deprivation. School timings may modulate sleep duration of students. Present finding reveals that sAA could be an appropriate non-invasive biochemical marker for the objective assessment of sleep deprivation among individuals as well as at population level.
KeywordsSalivary alpha amylase Sleep deprivation Adolescents Excessive daytime sleepiness
We are grateful to the school authorities and student participants for their kind cooperation. We also thank Chhattisgarh Council of Science and Technology (CGCOST), Raipur for their financial support and Head, School of life sciences, Pt. Ravishankar Shukla University, Raipur for providing facilities to carry out this work.
This study was funded by Chhattisgarh Council of Science and Technology (CGCOST), Raipur (Grant no. 8043/CCOST/MRP/13, Raipur dated 27/12/2013).
Compliance with ethical standards
Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (IEC Ref No. 017/IEC/PRSU/2013 dated April 15, 2013) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
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