Study type: Medical/biological study (observational study)

Effect of mobile usage on serum melatonin levels among medical students. med./bio.

Published in: Indian J Physiol Pharmacol 2014; 58 (4): 395-399

Aim of study (acc. to author)

The effects of mobile phone usage on the circadian rhythm of the melatonin concentration in the blood of students should be investigated.

Background/further details

Volunteer students from 18-22 years with more than one year of GSM mobile phone usage were included in the study and divided into two groups (n=30 each): 1) subjects which used their mobile phones for more than 2 hours/day and 2) subjects which used their mobile phones for 2 hours/day or less.
From each subject, 3 blood samples were taken on the same day: one sample in the morning (3-4 am), one at noon (1-2 pm) and one in the evening (5-6 pm).

Endpoint

Exposure

Exposure Parameters
Exposure 1:
Exposure duration: more than 2 hours/day of mobile phone usage
-
Exposure 2:
Exposure duration: 2 hours/day or less of mobile phone usage
-

Exposure 1

Main characteristics
Frequency
Type
Exposure duration more than 2 hours/day of mobile phone usage
Exposure setup
Exposure source
Parameters

No parameters are specified for this exposure.

Exposure 2

Main characteristics
Frequency
Type
Exposure duration 2 hours/day or less of mobile phone usage
Exposure setup
Exposure source
Parameters

No parameters are specified for this exposure.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

No significant differences were found in the melatonin levels over the day between both groups.
There was a non-significant negative correlation (r=-0.66) between hours of mobile phone usage and levels of melatonin.
(remark EMF-Portal: the results were not adjusted for confounders (e.g. sleep parameters, see Saxena et al. 2014).)
The authors conclude, that there might be some evidence for a relationship between mobile phone usage and the circadian rhythm of the melatonin concentration in the blood of students.

Study character:

Study funded by

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