Collection of References

PhilSHIFT Reseach Team maintains a collection of research and studies on chronobiology and shift work in the Philippines stored in the EUCLOCK Information System (EUCLIS).

Major references with softcopy are available online in the PhilSHIFT Collection and if you want  to suggest some past and present research and studies about chronobiology and shift work in the Philippines, or contribute to our collection, then:

  1. Register for an account at EUCLIS
  2. If your account has been approved, you can login in to EUCLIS and go to Clock References and access PhilSHIFT Collection which is under Project Collection.

Please find the references listed below for your perusal.

Contribute your work to this list

Let us know if you have work that could be added to this list - our contacts are below.

References that are specific to Shift Work Research in the Philippines

Adala KB, Bolinguit EAB, Echon MAP, Vinluan KCJ. Nutritional status of call center agents aged 20 to 35 years at a selected company. Thesis. University of the Philippines Manila, 2007.

Alfaro, RO, De Leon, CAC, Guieb, PC. Analysis of factors influencing work performance in a Call Center. Thesis. De La Salle University, Philippines, 2005.

Asis, R., Navarro, M., Quijano, G., Rosana, L., Turingan, R. ,& Co-Aseron, A. Prevalence of musculoskeletal disorders among call center workers in NCR: A pilot study.  Thesis.  University of Sto. Tomas, Manila, Philippines, 2006. 

Averia, JRC, Joson, JS, Reyes, JMM. An Ergonomic Study on the Shift Work of Medical-Surgical Unit Nurses of the Manila Sanitarium and Hospital. Thesis. De La Salle University, Philippines, 2005.

Cahanding MATC, Cordova P-IE, Ong JAG, Pili MMAG, Vallesfin JAB and Manalang GF Jr. Description of activities of selected Filipino call center agents from different work shifts in U.P.-Ayala Land Technohub, Quezon City using the Day Reconstruction Method. Special Studies, Bachelor of Science in Public Health. College of Public Health, University of the Philippines Manila. 2013

Crisostomo AC, Lim IT, Claudio KM. An Analysis of Work Hours of Surgical Residents in Selected Training Hospitals in the Philippines. Philippine Journal of Surgical Specialties, 2012.

De Castro AB, Fujishiro K, Rue T, Tagalog EA, Samaco-Paquiz LPG, Gee GC. Associations between work schedule characteristics and occupational injury and illness. International Nursing Review 2010; 57:188–194.

Dominguez EA, Salonga R, Jorge M, Terencio J.  Sleepiness and sleeping patterns among air traffic controllers and communicators. Chest 2006; 130: 266S-d-267.

Gutierrez A. A survey on the present shiftwork practices in the semiconductor industry. Thesis. De La Salle University, Philippines, 2003.

Gutierez AMJ. An Investigative Study on the Effects of Shift Work on the Medical-Surgical Nurses of Manila Sanitarium and Hospital. (Presented at the Human Factors and Ergonomics Society of the Philippines Symposium, 12 July 2013. College of Public Health, University of the Philippines Manila)

Ho H, Ples M, Sia Su G. Sleep Problems, Work-Stress and Health Complaints in Call Centers in Quezon City, Philippines. eHealth International Journal 2008;4, 20-23.

Jayme JB, Capio C.  Incidence of Work-Related Musculoskeletal Disorders of the Elbows and Hands/Wrists Among Call Center Representatives in One Call Center. Thesis. University of the Philippines Manila, 2004.  

Keitel R, Ledesma DM. Night Work Prohibition of Women Workers in the Philippine Call Center Industry. Conference on Regulating for decent work: Innovative labor regulation in a turbulent world, 2009. (URL:

Manuel CS, Ramos RR. Work Organization and Work-Life Balance in the BPO Sector: the Experiences of Selected BPO Workers in Metro Manila. University of the Philippines, SOLAIR, 2008.

Marquez A. A comparative study of the nurses' documentation in the 8-hour and 12-hour shift at the ICU of PCGH. Thesis. University of the Philippines Manila, 2000.

Melgar IE, Bangi A, Mandel J, McFarland W, Daganzo MA. Risk behaviors among young professionals in the Philippines: a qualitative study. Project Report. Institute of Philippine Culture, Ateneo de Manila University and University of California San Francisco, 2010.

Melgar IE, Ofroneo MP, Kintanar NS, Canoy N. Risk behaviors among young professionals in the Philippines. Project Report. International Labour Organization, 2009.

OSHC (The Occupational Safety and Health Center), Department of Labor and Employment. Comparison of Health and Well-being of Females Working in Day and Night Shift. 2001. (URL:

OSHC (Occupational Safety and Health Center), Department of Labor and Employment.  Case Study on the Health, Safety and Working Conditions in a Call Center. 2003.

OSHC (Occupational Safety and Health Center), Department of Labor and Employment.  The occupational safety and health conditions in selected contact centers in the Philippines. 2007. (URL:

Palabay C, Jorge II M.  Comparative Study of Sleeping Patterns and Daytime Sleepiness of Call Center Employees and Regular Office Workers. Phil. J. of Internal Medicine 2007; 45: 49-56.

Sibal JV. Strengthening offshoring in the Philippines: issues and concerns. The Forum 2011; 12(3). (URL:

UPDPI (University of the Philippines Diliman Population Institute) / ILO (International Labor Office). Lifestyle, health status and behavior of young workers in call centers and other industries: Metro Manila and Metro Cebu. Final Report (submitted on March 12, 2010).

Research and Studies that are significant to Shift Work Research

Abadilla EV. Call center address high Attrition Rate. The Manila Bulletin Newspaper Online. January 27, 2010. (URL:

Juda M. The importance of chronotype in shift work research. Dissertation. Faculty of Psychology, Ludwig-Maximilians-University Munich, 2010. (URL:

Kantermann T. Challenging the human circadian clock by Daylight Saving Time. Dissertation. Ludwig-Maximilians-University Munich, 2008. (URL:

Kantermann T, Juda M, Vetter C, Roenneberg T.  Shift-work research: Where do we stand, where should we go?. Sleep and Biological Rhythms 2010; 8: 95–105. doi: 10.1111/j.1479-8425.2010.00432.x

Lal N. Philippines pulls ahead of India in race for outsource dollars. The Jakarta Globe (November 18, 2010).

Lee Philips M.  Of owls, larks and alarm clocks. Nature 2009: 458, 142-144.

Manigque E, Cadaoas JM, Elizalde Z, Espiritu E, Hamoay B,  del Rosario V (Contributors). Shift work in the Philippines. Institute of Labor and Manpower Studies, Ministry of Labor and Employment, Philippines, 1985?.

Mendoza ER and Aguila MER. Social jet lag, shift work and senior citizens. NAST Transactions 2010 (Proceedings of NAST ASM, Manila, July 14-15, 2010).

Möller-Levet, C.S., Archer, S.N., Bucca, G., Laing, E., Slak, A., Kabiljo, R., Lo, J.C.Y., Santhi, N., von Schantz, M., Smith, C. and Dijk, D.-J. Effects of insufficient sleep on circadian rhythmicity and expression amplitude of the human blood transcriptome. Proceedings of the National Academy of Sciences of the United States of America, USA, March 19, 2013. 110:12, E1132–E1141. doi: 10.1073/pnas.1217154110

Philippine Star. RP BPO revenues hit $7.2 billion in 2009. February 8, 2010. (URL:

Philippine Star. Philippine BPO revenue to hit 50B by 2020. June 7, 2011. (URL:

Roenneberg T, Kuehnle T, Juda M, Kantermann T, Allebrandt K, Gordjin M, Merrow M.  Epidemiology of the human circadian clock.  Sleep Medicine Reviews, 2007: 11, 429 – 438.

Roenneberg T, Wirz-Justice A, Merrow M. Life between clocks: daily temporal patterns of human chronotypes. J. Biol. Rhythms 2003; 18:80–90.

Vetter C. Clocks in action: Exploring the impact of internal time in real life. Dissertation. Faculty of Psychology, Ludwig-Maximilians-University Munich, 2011. (URL:

Wittmann M, Dinich J, Merrow M, Roenneberg T. Social jetlag: misalignment of biological and social time. Chronobiology International 2006; 23(1&2): 497-509. (URL: