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Tiredness can be measured with voice
Adam Vogel PhD, University of Melbourne, Australia, investigated the tiredness management examining a group of 18 people. The people provided so called speech samples every 2 hours. Vogel and his colleagues investigated the speech components thus the length of pauses made and the full time of the speech. According to the results when we get tired our speech becomes slower and the pitch of tone drops. The scientists made a conclusion that when little by little we get tired we lose the control over the muscles responsible for the speech.