Published by the Labour Department 9/2008-1-OHB118

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This guide is prepared by the Occupational Safety and Health Branch,Labour Department

This edition September 2008

This guide is issued free of charge and can be obtained from the officesof the Occupat ional Safety and Heal th Branch of the LabourDepartment. It can also be downloaded from website of the Departmentat http://www.labour.gov.hk/eng/public/content2_9.htm. For enquiriesabout addresses and telephone numbers of the offices, please refer toLabour Departments website at http://www.labour.gov.hk/eng/tele/osh.htmor call 2559 2297.

This gu ide may be f ree ly reproduced except for adver t is ing,endorsement or commercial purposes. Please acknowledge thesource as "Guide on Shift Work" published by the Labour Department.

CONTENTS

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1Introduction

1. Shift work is common in many sectors. Essential andemergency services such as medical, transport, fire and rescue,law enforcement services and some public services have tobe provided round-the-clock. In recent years, some serviceestablishments such as convenience stores and fast food shopsalso provide 24-hour service and employees concernedtherefore are required to work in shifts. Suitably arrangedshift work is important to employees, employers and the self-employed.

2. This Guide aims to draw the attention of employers andemployees to the importance of shift arrangements involvingovernight shifts. Although it is not legally binding and hencecompliance is not mandatory, it strongly recommendsemployers and employees to make reference to the factorsmentioned here in working out suitable shift-workarrangements that could both minimise the adverse healthimpact on the employees and meet the operational needs ofthe organisations.

Suitable Shift-WorkArrangements

meet the operational

needs of the

organisations

minimise the adverse

health impact on the

employees

23. According to the International Labour Organization, workingin shifts is "a method of organisation of working time in whichworkers succeed one another at the workplace so that theestablishment can operate longer than the hours of work ofindividual workers" at different daily and night hours. Theshift system can be generally classified into a fixed shift systemand a rotating one.

Fixed / RotatingShift System

4. Fatigue may lead to accidents in the workplace, endangeringnot only the employees themselves, but also other people. Byminimising possible health impact on the employees, goodshift arrangements help reduce workplace accidents andenhance employees overall productivity and quality of service;and are thus beneficial to employees, employers as well as theclients they serve. Similarly, self-employed persons shouldalso be aware of the importance of suitable shift-workarrangements.

5. Some organisations have distinctly different requirements andconstraints. Some factors described in this guide, therefore,may not be applicable or practicable. In the circumstances,the shift work should be so arranged taking into account allrelevant factors.

3Health and Social Effects of Shift Work

6. Many human physiological, psychological and behaviouralindicators (such as body temperature, mood, endocrine functionand alertness) change with the biological clock (circadianrhythm) which generally operates on a cycle of around 24hours. Some shift arrangements can disrupt the circadianrhythm, and may have adverse physiological, psychologicaland social impact on the employees, which could impair theemployees performance as well as efficiency. For example,prolonged irregular shift work can affect the quality of sleepof the employees and may, in severe cases, cause healthproblems such as hypertension and gastrointestinal problems,or affect the social life of employees.

Biological

Clock

Disruption

4Shift Work Arrangements

7. In order to alleviate the possible effects of shift work onemployees, there are some factors, elaborated in paragraphs8-10, that could be considered in making shift arrangements forprotecting their occupational safety and health. Employers andemployees should, where possible, take into account these factorsin working out shift arrangements.

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8. Optimising the arrangement for shift work can help reducepossible health effects on employees. There are a number offactors which employers may take into consideration -

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(a) the necessity of 24-hour operation: if overnight shifts areunavoidable due to operational needs, an appropriate levelof staffing could minimise the number of overnight shiftsrequired as far as possible while meeting the operationalneeds of the organisations;

(b) the necessity of permanent night shifts: some employeesmay not be able to cope with permanent night shifts.Employers should consider requiring employees to shareout the assigned overnight shift work through staff rotation;

(c) the direction of rotation of shifts: medical opinionsgenerally recommend a "Forward Rotating Shift" pattern,in the order of early shift, late shift and night shift, foremployees working in rotating shifts, because the biologicalclock adjusts better when moving ahead than back;

night shift early shift

late shift

ForwardRotating Shift

pattern

5(d) the length of the rotation period (i.e. the number of dayson any one shift before switching to the next shift): medicalliterature suggests that a fast rotating shift pattern (e.g.rotating the shifts every 2-3 days) could reduce disruptionof the biological clock, while rotation of the shifts after alonger period (e.g. every 3-4 weeks) allows time foradaptation of the biological clock. Either shift patternscould be considered, taking into account the circumstancesof the operations;

(e) the time at which a morning shift starts: early morningshifts may be associated with shorter sleep and greaterfatigue. It is advisable to avoid early morning starts as faras practicable and consider fitting the shift time in withthe availability of transport, in particular for workplacesin remote locations and employees having to travel for longhours to work;

(f) the length of a work shift: an extended shift has theadvantage of fewer consecutive night shifts and longerblocks of time off. However, additional fatigue from longerwork hours may have adverse health effects. The physicaland mental load of the task should be taken intoconsideration when considering the length of a work shift.Unless justified by special circumstances such as importantoperational requirements or a preference generally sharedby staff concerned, unduly extended shift (includingovertime) should be avoided as far as practicable. If the

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work is continuous throughout a shift and is alsodemanding, monotonous, dangerous and safety-critical,employers should consider whether shortening each shiftis necessary, or should consider introducing rest breaksin each shift to help employees cope with their workmentally and physically;

(g) rest break arrangements: suitable rest breaks foremployees allow them to relax and recuperate. This isparticularly important for employees working in shifts.Apart from rest breaks within a shift, there should alsobe time for rest between shifts. For arrangements ofrest breaks, please refer to the Guide on Rest Breakspublished by the Committee of Occupational Safety andHealth of the Labour Advisory Board. This is availablein the Labour Departments Occupational Safety andHealth Branch offices or Labour Departments website athttp://www.labour.gov.hk/eng/public/content2_8d.htm;

Unduly extended shift

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Suitable rest break

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(i) quality of the work environment: a safe and adequatelylighted environment with suitable temperature,preferably adjustable, is conducive to the health andproductivity of shift workers;

(j) training on shift work for employees: suitable trainingcould include an explanation of the possible health effectsof shift work and tips on possible ways to prevent sucheffects, appropriate arrangements on social activities tominimise social isolation due to shift work, and stressrecognition and management; and

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(h) off-duty days in a shift schedule: regular off-duty daysin a shift schedule enable employees to plan for socialand domestic activities;

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(k) facilities provided for employees on shifts: providingsimilar facilities in different shifts offers a familiarenvironment, which could better enable employees tocope with the shift work.

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9. To protect their own occupational safety and health, employeesengaged in shift work can consider the following factors -

(a) the mode of transportation: using public transport ratherthan driving to and from work could avoid tiredness fromdriving before and after undertaking shift work;

(b) maintaining good quality sleep and a healthy lifestyle:(i) sleeping on a set schedule could help establish

routine and make sleep during the day easier;(ii) a dark and quiet environment is conducive to sleep

after finishing night-shift work and when going tobed early that night;

(iii) relying on sleeping pills to aid sleep may causedrug dependence. It is healthier to use relaxationtechniques to aid sleep;

910. Employees who are suffering from certain diseases, such asdiabetes mellitus and gastric ulcer, requiring regular follow-up consultation and medication should inform their doctorsabout their shift work arrangements. This will enable thedoctors to plan appropriate treatment for them. They can referto the publications entitled "Work and Diabetes" and "Workand Common Gastrointestinal Diseases" published by theLabour Department for further information about how thesecommon diseases and work affect each other.

(iv) drinking coffee, tea or alcoholicbeverages before sleep wouldadversely affect sleep quality;

(v) heavy meals and/or fatty, spicyfood before sleep should beavoided and time should beallowed for digestion, andabstinence from smoking andalcohol;

(vi) regular exercise, balanced dietand adequate sleep help maintainhealth;

(vii) making use of cigarette or coffeeto keep you alert at work is a badpractice; and

(c) making family and friends aware of your shift schedule:this will enable them to take into account your availabilitywhen planning family and social activities.

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Dialogue between Employers and Employees

11. No single pattern of overnight shift arrangements can suit thedivergent needs of different organisations. A suitable shiftarrangement is beneficial to employers, employees, and insome cases even members of the public. As far as possible,employers should involve employees in working out the mostsuitable shift arrangements that can meet the needs oforganisational operation, ensure service quality and have regardto the safety and health of employees. For establishments withworkplace communication mechanism (including safetycommittees), employers could make use of such mechanismto seek the views of employees on the shift arrangements. Itis always a good practice for employers to inform theiremployees as early as possible of the need to work in shifts(e.g. before the employment and posting is effected) so thatthey can make necessary arrangements in their family andsocial commitments in advance.

Shift WorkArrangementEmployees Em

ployer

s

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Enquiries

12. For enquiries on this booklet or advice on occupational healthand hygiene matters, please contact the Labour Department'sOccupational Safety and Health Branch through:

Telephone : 2852 4041Fax : 2581 2049E-mail : enquiry@labour.gov.hk

13. Information on the services offered by the Labour Departmentand on major labour legislation can also be found on ourHomepage at http://www.labour.gov.hk.

Complaints

14. If you have any complaints about unsafe workplaces and practices,please call the Labour Department's occupational safety and healthcomplaint hotline at 2542 2172. All complaints will be treated inthe strictest confidence.

Published by the Labour Department 9/2008-1-OHB118