7. How does wearing an apron protect you against back injury? 8. The NIOSH lifting guideline has a load constant of 23 kg and six multipliers. Name the six multipliers and explain their importance to the equation.

7. Wearing an apron does not directly protect against back injury. However, it can indirectly contribute to safety by preventing slips, trips, and falls. If you're working with liquids or slippery substances, an apron can keep your clothes dry and prevent you from slipping. It's important to note that proper lifting techniques and ergonomics are the primary ways to prevent back injuries.

8. The six multipliers in the NIOSH lifting guideline are:

   a. Horizontal Multiplier (HM): This relates to the distance from the midpoint between the ankles to the hands' grasp. The further the load is from the body, the more strain it puts on the back.

   b. Vertical Multiplier (VM): This relates to the height of the hands from the floor during lifting. Lifting from a lower position can put more strain on the back.

   c. Distance Multiplier (DM): This relates to the vertical travel distance of the hands between the origin and the destination of the lift. The greater the distance, the more strain it puts on the back.

   d. Asymmetry Multiplier (AM): This relates to the angle of twisting or turning the body during lifting. The more the body is twisted, the more strain it puts on the back.

   e. Frequency Multiplier (FM): This relates to the number of lifts performed per minute. The more frequent the lifting, the more strain it puts on the back.

   f. Duration Multiplier (DurM): This relates to the duration of lifting activity. The longer the duration, the more strain it puts on the back.

Each of these multipliers is important because they all contribute to the overall strain on the back during lifting. By considering all these factors, the NIOSH lifting guideline helps to determine safe lifting practices and prevent back injuries.