# What is multiple fiber summation?

## What is multiple fiber summation?

Multiple fiber summation When a weak signal is sent by the central nervous system to contract a muscle, the smaller motor units, being more excitable than the larger ones, are stimulated first. As the strength of the signal increases, more (and larger) motor units are excited.

### How do you calculate Tetanizing frequency?

1. Tetany is the continuous contraction of muscle fibers, without latent period & relaxation period.
2. Tetanizing frequency depends on contraction time.
3. Twitch duration = Contraction period= 40 millisecond = 0.04 sec (l millisecond=0.001 second)
4. Tetanizing frequency = l/Contraction period = l/0.04= 25 Hz.

#### What is multiple motor unit summation?

The combined effect of a number of motor units acting within a muscle at any given time.

What are the different components of a Myogram?

A myogram traces the three phases of a muscle twitch. X-axis = “Time (milliseconds).” Y-axis = “Percentage of Maximum Tension.” Intercept = zero, which is the point of motor neuron stimulation.

What is critical Tetanizing frequency?

TETANIZING FREQUENCY: RATE OF STIMULATION AT WHICH SUMMATION OF CONTRACTIONS WILL OCCUR (I.E. TETANUS WILL OCCUR) = 1/CONTRACTION PERIOD DURATION FACTORS AFFECTING MINIMUM TETANIZABLE FREQUENCY: a) Strength of stimulation: affect the contraction period b) Fatigue of muscle: it increases the duration of CP  lesser …

## How do you calculate stimulus frequency?

To calculate frequency divide 1 by the time interval. Here’s an example: If you measured the minimum time interval between stimuli where partial tetanus began as . 2 sec, then the frequency of stimulus was 1/. 2 or 5 stimuli per second.

### What is the difference between wave summation and multiple motor unit summation?

Wave summation increases the frequency of contractions to produce greater force while motor unit summation uses increased motor unit recruitment.

#### What is the difference between summation and recruitment?

Summation occurs as successive stimuli are added together to produce a stronger muscle contraction. Tetanus is the fusion of contractions to produce a continuous contraction. Increasing the number of motor neurons involved increases the amount of motor units activated in a muscle, which is called recruitment.

What does a Myogram measure?

Also called a myogram, an electromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of the muscle. The test is used to help detect neuromuscular abnormalities.

What is the purpose of Myogram?

A myelogram is a diagnostic imaging test generally done by a radiologist. It uses a contrast dye and X-rays or computed tomography (CT) to look for problems in the spinal canal. Problems can develop in the spinal cord, nerve roots, and other tissues. This test is also called myelography.

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