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Gayline F. Manalang Jr., PTRP, MOH
Assistant Professor
Department of Environmental and Occupational Health

Professor Gayline F. Manalang Jr. is a physical therapist and occupational health professional. Before joining the College of Public Health, she was an instructor at the College of Allied Medical Professions.
As faculty of the University, most of Professor Manalang’s extension and community service work had been with the Philippine Physical Therapy Association (PPTA), the Institute of Aging of the UP Manila-National Institutes of Health, and more recently the Philippine Society of Geriatrics and Gerontology (PSGG).

Professor Manalang’s main research pursuits are with PhilSHIFT interdisciplinary group from the University of the Philippines and the Ludwig Maximilians University Munich (LMU Munich) whose collaborative efforts aim to study the Filipino chronotype (biological clock) and shift work. A research program of the UP Center for Integrative and Development Studies (CIDS), PhilSHIFT hopes to work with industry towards strategies that promote health, productivity, and sustainability of the local contact center workforce.

Professor Manalang is Principal Investigator of a PhilSHIFT project implementing the Philippine Chronotype and Social Jetlag Survey and developing a chronotype questionnaire for shift workers. This is part of her doctoral studies at the Center for International Health, LMU Munich. Her doctoral project concerns the Filipino chronotype, productivity, and health of contact center workers. This project is funded jointly by the CIDS and Philippine Council for Health Research and Development (PCHRD).

If you are a Filipino whose work or activities happen during the day, Professor Manalang invites you to find out your chronotype by participating in the Filipino Chronotype and Social Jetlag Survey. Join the ~9​,​​000 Filipinos who have already done so by answering the Philippine Munich Chronotype Questionnaire (PhilMCTQ) at the PhilSHIFT homepage ( You will receive a chronotype evaluation and your response will be included in a database that will help us understand biological timing among Filipinos.



  • Gabud, RS, Manalang, GF Jr., Chua, RBL, Mendoza, ER, and Lozano-Kühne, JP.. An assessment of chronotype and social jetlag among Filipinos.. International Journal of Philippine Science and Technology. (2015); 1 (1);
  • Carlos AC, Enoveso RA, Palmares ML, Sayson LA, Tejano KP, and Manalang GF Jr.. Rerceived Occupational Hazards of Sanitary Inspectors from Two Urban Cities in the Philippines. Acta Medica Philippina. . (2015); 49 (3);
  • P. Lozano-Kuhne, M.D. Aguila, G. Manalang Jr., R.B.Chua, R. Gabud, E. Mendoza. Shift Work Research in the Philippines: Current State and Future Directions. Philippine Science Letters. (2012); 5(1);
  • Manalang, GF Jr.. Occupational health and safety training of personnel in selected DOH hospitals in Metro Manila. Acta Medica Philippina. . (2010); 44 (1);