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V-MAC FAQs

In this situation, using the V-MAC won't help you with your risk assessment. You may need to ask your suppliers to tell you the weights or to mark them on each item.

Carrying involves effort by the worker and takes time. There are studies that have compared the effect on heart rate of lifting and of carrying. The carry factor uses this information to convert the total carry distance into an equivalent number of lifts.

Like the MAC tool[79], the V-MAC ignores carry distance if the average distance is less than 2 m – it treats it as a lift.

No, the V-MAC will help you assess just the lifting part of the job. But if your workers are under time pressure then taking account of the carrying can tell you more about the demands on them.

Yes. You will probably need to spend more time collecting the weight data than for jobs where a Warehouse Management System can tell you exactly what each person lifted.

No. Factors such as where the load is in relation to the worker can be assessed with the MAC[80]. What you should do is follow the advice for the MAC[81] and assess the 'worst case scenario' for each factor. In your case this would be for the 'Hand distance from the lower back', the 'Vertical lift region' and 'Torso twisting and sideways bending'.

The MAC website[82] gives an example of assessing an worker lifting from a pallet placed on the ground. At the time you do the assessment the pallet may be half full and the worker may be lifting from waist height. Remember, at some point the worker will be lifting items from the bottom level of the pallet and therefore will be at greater risk.

The load weight/frequency factor is different to the other risk factors because there are complex relationships between the weights that are safe to handle, the frequency of lift and the total number of lifts. The graphs in the MAC and V-MAC help you look at these. Frequent lifting can be as hazardous as infrequent lifting – it depends on the weights being handled and whether or not the worker can take breaks or pauses.

As the load position moves away from the ideal position in front of and close to the body at around knuckle height, the risk increases so for factors such as 'Hand distance from the lower back' you need to look at the worst individual lifts. If you want, you can look at how many lifts a worker does over a day in the 'Close', 'Moderate' and 'Far' categories. A worker who does 1000 lifts in the 'Close' zone, 100 in the 'Moderate' zone and 10 in the 'Far' zone will be at less risk than someone who does 10 in the 'Close' zone, 100 in the 'Moderate' zone and 1000 in the 'Far' zone.

You can use the V-MAC for jobs in these environments. Bulky clothing may slow down how quickly they handle loads. Workers will probably need to spend more time in other areas to avoid heat stress or getting too cold, so will have less time available for handling loads. There is HSE guidance on thermal comfort in hot and cold environments[83] and on handling food in chill units and freezers[84].

Yes, but you will have to spend more time doing the assessments. If the demands on each person are about the same you should find that doing a small number will be enough.

Yes. Handling several light items at once is a good idea because it reduces the number of lifts, so is usually quicker. Of course, if lots of items are handled at once, then the risk of the worker losing control of them increases. Also, the worker should not handle too many items and overload him/herself.

  • Talk to them about exactly how they do the job;
  • Ask them directly if they do this;
  • Watch/video them doing the job.

The graph shows bars for the mean, median and mode of the distribution of weights. These are all different types of 'average' and say something about the middle of the distribution.

  • The mean is what most people mean by the 'average'. All the individual weights are added up and the total is divided by the total number of lifts.
  • The median, or 50th percentile weight, is the middle value when all the weights are put in order. It is smaller than half of the weights and larger than the other half.
  • The mode is the most common single load weight.

When the frequency distribution graph is a smooth bell-shaped curve, the mean, median and mode are all in the same place in the middle of the curve. This won't be the case in many assessments, which is why they are all shown.

The graph also shows the 25th and 75th percentile weights. These show how spread out the distribution is. The middle 50% of the distribution is between these two weights. The difference between the 25th and 75th percentiles is called the 'inter-quartile range'.

The 75th percentile is the middle point of the heavy half of the graph.75% of the weights are lighter than the 75th percentile, and only 25% of weights are heavier. Similarly, 25% of the weights are lighter than the 25th percentile, and 75% are heavier.

To take account of carrying, an adjustment is added on top of the bar for the mean weight. This works by converting carrying distance into an equivalent number of lifts.

The heights of the summary bars indicate the overall demands of the job on the worker over a shift.

The colour zones change as the total number of lifts increase because very frequent handling will result in fatigue.

It is unlikely that a single weight would be handled enough times to reach the higher limits but the effect of all the lifting in a shift can be fatiguing even if all the individual weights are low.

The bars for the mean and median are all the same height. This is the total number of lifts entered into the spreadsheet — the total number of lifts over the shift.

The heights of the bars for the 25th and 75th percentile weights are half of the total number of lifts. This is because they mark the middles of the two halves of the distribution.

Sometimes the summary bars overlap. The Summary table gives you actual values for all the summary bars.

Previous page: Worked examples[85]

Link URLs in this page

  1. MSDshttps://www.hse.gov.uk/MSd/msds.htm
  2. Back painhttps://www.hse.gov.uk/MSd/backpain/index.htm
  3. Upper limb disordershttps://www.hse.gov.uk/MSd/uld/index.htm
  4. Lower limb disorders https://www.hse.gov.uk/MSd/lld/index.htm
  5. Display screen equipment (DSE)https://www.hse.gov.uk/MSd/dse/index.htm
  6. Manual handling at workhttps://www.hse.gov.uk/MSd/manual-handling/index.htm
  7. Overview - MSD toolkithttps://www.hse.gov.uk/MSd/toolkit.htm
  8. Overview - MAC toolhttps://www.hse.gov.uk/MSd/mac/index.htm
  9. Introduction to MAChttps://www.hse.gov.uk/MSd/mac/introduction.htm
  10. Developmenthttps://www.hse.gov.uk/MSd/mac/development.htm
  11. Score sheethttps://www.hse.gov.uk/MSd/mac/scoresheet.htm
  12. Overview - Liftinghttps://www.hse.gov.uk/MSd/mac/liftintro.htm
  13. Lifting from pallet videohttps://www.hse.gov.uk/MSd/mac/liftvid1.htm
  14. Lifting creels of wire videohttps://www.hse.gov.uk/MSd/mac/liftvid2.htm
  15. Lifting control measureshttps://www.hse.gov.uk/MSd/mac/guidance01a.htm
  16. Overview - Carryinghttps://www.hse.gov.uk/MSd/mac/carryintro.htm
  17. Carrying from conveyor videohttps://www.hse.gov.uk/MSd/mac/carryvid1.htm
  18. Carrying task in pastry factory videohttps://www.hse.gov.uk/MSd/mac/carryvid2.htm
  19. Carrying control measureshttps://www.hse.gov.uk/MSd/mac/guidance02a.htm
  20. Overview - Team handlinghttps://www.hse.gov.uk/MSd/mac/teamintro.htm
  21. Team handling pallet videohttps://www.hse.gov.uk/MSd/mac/teamvid1.htm
  22. Team handling container videohttps://www.hse.gov.uk/MSd/mac/teamvid2.htm
  23. Team handling control measureshttps://www.hse.gov.uk/MSd/mac/guidance03a.htm
  24. Psychosocial risk factorshttps://www.hse.gov.uk/MSd/mac/psychosocial.htm
  25. Individual differenceshttps://www.hse.gov.uk/MSd/mac/individuals.htm
  26. MAC assessment tipshttps://www.hse.gov.uk/MSd/mac/tips.htm
  27. MAC FAQhttps://www.hse.gov.uk/MSd/mac/faq.htm
  28. Overview - V-MAChttps://www.hse.gov.uk/MSd/mac/vmac/index.htm
  29. Advantages and limitationshttps://www.hse.gov.uk/MSd/mac/vmac/1-advantages-limitations.htm
  30. What you need to knowhttps://www.hse.gov.uk/MSd/mac/vmac/2-what-you-need-to-know-before.htm
  31. How to use the V-MAChttps://www.hse.gov.uk/MSd/mac/vmac/3-how-to-use.htm
  32. Which jobs and workers to assesshttps://www.hse.gov.uk/MSd/mac/vmac/4-which-jobs-workers-to-assess.htm
  33. Entering datahttps://www.hse.gov.uk/MSd/mac/vmac/5-entering-data.htm
  34. What does the V-MAC tell you?https://www.hse.gov.uk/MSd/mac/vmac/6-what-does-vmac-tell-you.htm
  35. Values in the summary tablehttps://www.hse.gov.uk/MSd/mac/vmac/7-summary-tables.htm
  36. Recording and usinghttps://www.hse.gov.uk/MSd/mac/vmac/8-recording-and-using.htm
  37. Worked exampleshttps://www.hse.gov.uk/MSd/mac/vmac/9-worked-examples.htm
  38. V-MAC FAQshttps://www.hse.gov.uk/MSd/mac/vmac/10-faqs.htm
  39. Overview - ART toolhttps://www.hse.gov.uk/MSd/uld/art/index.htm
  40. What is the ART toolhttps://www.hse.gov.uk/MSd/uld/art/whatis.htm
  41. Overview - Learning to use the ART toolhttps://www.hse.gov.uk/MSd/uld/art/learning.htm
  42. Preparationhttps://www.hse.gov.uk/MSd/uld/art/preparation.htm
  43. Risk factorshttps://www.hse.gov.uk/MSd/uld/art/riskfactors.htm
  44. Observationhttps://www.hse.gov.uk/MSd/uld/art/observation.htm
  45. Overview - Making an assessmenthttps://www.hse.gov.uk/MSd/uld/art/assessment.htm
  46. Task descriptionshttps://www.hse.gov.uk/MSd/uld/art/task.htm
  47. Overview - Assessment guidehttps://www.hse.gov.uk/MSd/uld/art/assessguide.htm
  48. A. Frequency and repetition of movementshttps://www.hse.gov.uk/MSd/uld/art/freqrep.htm
  49. B. Forcehttps://www.hse.gov.uk/MSd/uld/art/forceassessment.htm
  50. C. Awkward postureshttps://www.hse.gov.uk/MSd/uld/art/awkpostures.htm
  51. D. Additional factorshttps://www.hse.gov.uk/MSd/uld/art/addfactors.htm
  52. Score sheethttps://www.hse.gov.uk/MSd/uld/art/score.htm
  53. A walkthroughhttps://www.hse.gov.uk/MSd/uld/art/walkthrough.htm
  54. Overview - Try it outhttps://www.hse.gov.uk/MSd/uld/art/try.htm
  55. Book bindinghttps://www.hse.gov.uk/MSd/uld/art/bookbinding.htm
  56. Jogging sheetshttps://www.hse.gov.uk/MSd/uld/art/jogging.htm
  57. Collating papershttps://www.hse.gov.uk/MSd/uld/art/papers.htm
  58. Whisky carton assemblyhttps://www.hse.gov.uk/MSd/uld/art/cartonassembly.htm
  59. Croissant curlinghttps://www.hse.gov.uk/MSd/uld/art/croissant.htm
  60. Overview - Analysis and actionshttps://www.hse.gov.uk/MSd/uld/art/analysis.htm
  61. What the scores meanhttps://www.hse.gov.uk/MSd/uld/art/scoresmean.htm
  62. Analysing task rotationhttps://www.hse.gov.uk/MSd/uld/art/rotation.htm
  63. Overview - Taking actionhttps://www.hse.gov.uk/MSd/uld/art/action.htm
  64. Repetitionhttps://www.hse.gov.uk/MSd/uld/art/repetition.htm
  65. Forcehttps://www.hse.gov.uk/MSd/uld/art/force.htm
  66. Posturehttps://www.hse.gov.uk/MSd/uld/art/posture.htm
  67. Durationhttps://www.hse.gov.uk/MSd/uld/art/duration.htm
  68. Physical environmenthttps://www.hse.gov.uk/MSd/uld/art/environment.htm
  69. Psychosocial issueshttps://www.hse.gov.uk/MSd/uld/art/psychosocial.htm
  70. Art Tool Resourceshttps://www.hse.gov.uk/MSd/uld/art/resources.htm
  71. Frequently asked questionshttps://www.hse.gov.uk/MSd/uld/art/faq.htm
  72. Overview - RAPP toolhttps://www.hse.gov.uk/MSd/pushpull/index.htm
  73. Push/pull riskshttps://www.hse.gov.uk/MSd/pushpull/risks.htm
  74. Push/pull risk assessmenthttps://www.hse.gov.uk/MSd/pushpull/assessment.htm
  75. The lawhttps://www.hse.gov.uk/MSd/legislation.htm
  76. Health monitoringhttps://www.hse.gov.uk/MSd/health-monitoring.htm
  77. Workershttps://www.hse.gov.uk/MSd/workers-msds.htm
  78. Resourceshttps://www.hse.gov.uk/MSd/resources.htm
  79. MAC toolhttps://www.hse.gov.uk/msd/mac/index.htm
  80. MAChttps://www.hse.gov.uk/msd/mac/index.htm
  81. advice for the MAChttps://www.hse.gov.uk/msd/mac/introduction.htm
  82. MAC websitehttps://www.hse.gov.uk/msd/mac/introduction.htm
  83. thermal comfort in hot and cold environmentshttps://www.hse.gov.uk/temperature/index.htm
  84. handling food in chill units and freezershttps://www.hse.gov.uk/food/chilled.htm
  85. Previous page: Worked exampleshttps://www.hse.gov.uk/msd/mac/vmac/9-worked-examples.htm
  86. MAC toolhttps://www.hse.gov.uk/msd/mac/index.htm
  87. ART toolhttps://www.hse.gov.uk/msd/uld/art/index.htm

Glossary of abbreviations/acronyms on this page

MAC
Manual handling assessment chart tool
ART
Assessment of Repetitive Tasks

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Updated 2024-08-13 ->