Question

In electromyography, electrical activity of the:

• A. hand is recorded using pathway chart
• B. muscle is recorded from suitable electrodes
• C. muscle is recorded using cyclegraph
• D. hand muscle is recorded using cyclegraph

Hint:

Remember:
- Myo- = Muscle
- Graphy = Recording
Therefore, electromyography is the recording of electrical activity in muscles.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Physiological measurements are used in ergonomics to quantify the physical cost of work on the human body.
These measurements monitor muscle activity, heart rate, and oxygen consumption to evaluate physical fatigue.

Step 2: Detailed Explanation:
Electromyography (EMG) is a diagnostic and experimental technique used to record the electrical activity produced by skeletal muscles.
When muscle fibers contract, they generate electrical potentials (action potentials) that can be detected using electrodes.
These electrodes can be:
Surface electrodes placed on the skin over the muscle of interest.
Needle electrodes inserted directly into the muscle tissue.
The recorded signal, called an electromyogram, helps researchers measure muscle fatigue, strain, and active force generation during physical tasks.
A pathway chart is a paper-based drawing tool used to track a worker's movements through a workspace, and is unrelated to electrical activity.
A cyclegraph is a photographic technique where small lights are attached to a worker's limbs to record movement paths on film, but it does not measure electrical activity.

Step 3: Final Answer:
Electromyography is the process of recording the electrical activity of muscles using suitable surface or needle electrodes.