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What is Repetition and Duration?

Repetition and duration are defined as movements that are performed continuously using the same muscle group with little rest and recovery over an extended period of time.

Repetition combined with other risk factors such as duration, force or awkward postures can quickly become a MSI hazard while performing a job task.

What are some of the hazards associated with Repetition and Duration?

If you use the same body parts for an activity repeatedly for a length of time without resting, your muscles will become fatigued increasing the risk of injury. Injuries from repetition and duration can happen even when using little force when performing a task.

Here are some of the common hazards related to repetition and duration.

  • Contact stress
  • Using poor posture to work on tasks
  • Utilizing a twisting motion when using hand tools
  • Local or hand/arm vibration
  • Whole body vibration
  • Cold temperatures
  • Hot work environments
  • Repeated impacts
  • Having a lack of knowledge or unaccustomed to the task performed.

How Can I Reduce the Risk of an Injury?

Here are some tips to working safely and preventing an injury from occurring.

  • When possible, push rather then pull the load this will cause less stress is applied to the shoulders.
  • Avoid uneven or rough floors.
  • Stay clear and do not try to catch a falling load.
  • Keep your elbows close to your body and your hands within the sides of the cart or equipment when pushing or pulling.
  • Always use both arms.
  • Use mechanical aids or enlist the help of a co-worker to lift or carry heavy or large items.
  • Use proper lifting technique.
    1. Feet shoulder width apart or around the load if possible.
    2. Firm grip on item.
    3. Elbows close to your body, back is straight and head up.
    4. Straighten legs and tighten your stomach muscles. (Don’t hold your breath.)
  • When carrying an object keep it close to your body.
  • Wear the appropriate footwear.
  • Plan your path of travel. Make sure it is free of obstructions and slippery surfaces.
  • Ensure your view is not obstructed and you can see where you are going.
  • Identifying which is the right grip to use for the task, power grip vs. a pinch grip.
  • Ensure you are using the right glove for the task.
  • Avoid moving too fast. Pace yourself.
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