Question

Which of the following point would you keep in mind while lifting a load. Keep:

• A. It at a small distance, only then lift it
• B. It at a distance of 40 cm from knees
• C. The load as close to the body as possible
• D. The knees forward and back straight

Hint:

To prevent back injuries, remember the rule: "Keep the load close."
This minimizes the leverage and force acting on your lower back.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Ergonomics is the study of how to design tasks and equipment to fit the human body, reducing fatigue, strain, and injury.
When lifting heavy objects, keeping proper body alignment is critical to minimize stress on the musculoskeletal system.

Step 2: Detailed Explanation:
When lifting a load, the physical distance between the load and the lifter's spine determines the moment arm of the force.
If the load is held far from the body, the leverage increases, which multiplies the rotational force (torque) acting on the lumbar spine.
By keeping the load as close to the body as possible, the moment arm is minimized.
This aligns the weight closer to the body's vertical center of gravity, reducing strain on the lower back muscles and ligaments.
While keeping the back straight and bending at the knees is also a recommended lifting posture, the primary physical principle to minimize strain is reducing the distance between the load and the body.
Holding a load 40 cm away or at a distance increases the risk of lower back strain.

Step 3: Final Answer:
The most important ergonomic rule when lifting a load is to keep the load as close to the body as possible.