Which of the following are the three major factors and stressors associated with poor body mechanics?

• A. Weather, lighting, and noise.
• B. Hydration, nutrition, and sleep.
• C. Speed, accuracy, and balance.
• D. Force, awkward posture/position, and repetition.

Answer: (D)

The key idea here is that poor body mechanics mainly come from three types of physical stress: the amount of force required to do the task, the use of awkward or extreme postures, and the repetition of movements. When a task demands a lot of force—like lifting, pushing, or pulling heavy baggage—the body experiences higher loads on the spine and muscles, which raises the risk of strains and injuries. Awkward postures, such as reaching overhead, twisting while moving a load, or bending with the spine in a stressed position, place unusual pressure on joints and soft tissues, leading to quicker fatigue and potential injury. Repetition compounds this by applying the same motions over and over, allowing small strains to accumulate into longer-term, overuse injuries.

In real work scenarios, such as handling luggage or operating carts, these three factors are the primary drivers of poor mechanics. Other factors like weather, lighting, or noise might affect comfort or safety in other ways, and aspects like hydration, nutrition, sleep, speed, and accuracy influence performance or fatigue, but they don’t define the core mechanical stresses on the body.