DOES THE CHRONOTYPE CLASSIFICATION NEED TO BE UPDATED? PRELIMINARY FINDINGS

作者：Martynhak Bruno Jacson^*; Louzada Fernando Mazzilli; Pedrazzoli Mario; Araujo John Fontenele

来源：Chronobiology International, 2010, 27(6): 1329-1334.

DOI：10.3109/07420528.2010.490314

• Bimodal
• Chronotype
• Morning and evening oscillators

Traditionally, chronotype classification is based on the Morningness-Eveningness Questionnaire (MEQ). It is implicit in the classification that intermediate individuals get intermediate scores to most of the MEQ questions. However, a small group of individuals has a different pattern of answers. In some questions, they answer as "morning-types" and in some others they answer as "evening-types," resulting in an intermediate total score. "Evening-type" and "Morning-type" answers were set as A(1) and A(4), respectively. Intermediate answers were set as A(2) and A(3). The following algorithm was applied: Bimodality Index = (Sigma A(1) x Sigma A(4))(2) - (Sigma A(2) x Sigma A(3))(2). Neither-types that had positive bimodality scores were classified as bimodal. If our hypothesis is validated by objective data, an update of chronotype classification will be required. (Author correspondence: [e-mail])

• 出版日期2010