Fatigue Voice Summary Part I

As I said before, if your body is tired or stressed, your voice quality will also suffer. Physical and mental conditions affect the voice.
Let’s discuss how using your voice too much can result in negative changes to the throat (vocal chord and external laryngeal ).
The biggest most noticeable change, would be that the vocal chord becomes ‘hyperemic’ and each muscle of the larynx would move the vocal chords which in turn could cause a metabolism disorder. the definition of hymeremic is any increase in the quantity of blood flow to a body part. If two vocal folds vibrate, too wide, and too long, capillaries begin to dilate and ultimately increase the blood flow surrounding the vocal cord muscles.
As a result, vocal fold gets more weight, and the voice gets slightly low in pitch. (Your pitch aims to be correct, but your exact pitch is a  fewer hertz lower than the correct notes)
One more important point is that the mucosa does not have anything to do with the cause or effect of the hyperemic process, in this specific example because there is no blood vessel in mucosal tissue.
However, if you keep abusing the vocal folds, it will cause the tissue fluid (blood plasma) to collect in Reinke’s space, and cause the vocal folds to get heavy. So if you still keep using vocal folds, the nonkeratinized stratified squamous epithlium swells and creates a vocal fold polyp. A polyp, sometimes referred to as a nodule, is growth that develops on the vocal cords of people who constantly strain their voices. A vocal fold polyp is usually localized to a specific area of the vocal chord but if overuse continues, the vocal folds will more than likely also show signs of inflammation, swell and become flabby. If you get in this situation, you might have to seek surgery to correct this issue. The way to identify overuse your voice and voice straining would be to listen to if the natural voice sounds like a lower pitch than normal or for falsetto flats.
If you feel a change to your natural voice and or falsetto voice, this could mean that it has been overworked. I recommend seeking a doctor who specializes in the vocal sound field.
–Level of Fatigue Voice–
Level1:” the voice quality is normal ” ”not a lot of change in the falsetto”
Level2:” the voice quality is normal ” ”falsetto is low”
Level3: ”the voice quality gets worse (hoarse voice)” ”hard to control voice pitch”

The muscles of the larynx, use vocalization as a form of exercise. The larynx and vocal chords constantly move, and are similar to the movements of an instrument. The muscles for moving the vocal chords get a work out when constricting of the resonance chamber occurs. It has been proven that practicing routine vocal maneuvers can lead to the development of specific control over individual muscle groups within the vocal mechanism.
Any sport can make muscles fatigued, if you overwork them.
Keep in mind, the neighboring muscle of the larynx is considered to be (1)thin and small (2)compensating controls is complicated (3)ambiguity (4)perceiving tissue is difficult, and vulnerable to overuse.
Even if lactic acid accumulates in a muscle, you would not notice until you felt a change in your voice, because it’s hard to distinguish the sensation of fatigue. The muscle can contract by itself but cannot extend because of its property.
This means that muscle movement does not work properly without exogenous forces, just like a seesaw.
The antagonistic actions are unclear when it comes to the muscles of the larynx …  muscle contractions would in fact definitely be constant when overused. Which sometimes causes hypertonic phonation or LDP (Larynx Deep Position) and makes the quality of phonatory function worse.
Furthermore, it’s hard to control tone pitch. It reduces voice volume and produces hoarseness. For preventing this issue, consider the condition of your throat and use your voice properly.

We will discuss the improvement method in part II.

Note 1:  FV = FatigueVoice, it means that extrinsic muscles have fatigue due to an overused voice.

Note 2 : LDP = Larynx Deep Position is when the secretory fluid decreases in the intralaryngeal muscle due to bad blood flow in the superior laryngeal artery. This causes that the throat to dry out. (There are many different factors to be considered because each persons individual thickness between the thyrohyoid bones varies)