Vocalization is operated by the movements of the musculus extrinsic laryngis and the vocal cords.
When measuring the degree of LDP (Larynx in a Deep Position) muscles’ hardness, the meter reads between 30-80 tone. At such a high levels, the larynx, the hyoid bone, the cricoid cartilage and the thyroid cartilage are positioned deeper than normal.
LDP causes muscles to move slow and makes it hard to sing speedy or fast paced songs. This is because when trying to sing and follow speedy music, the muscles can’t react and keep up, it in turn causes hypertonic vocalization and hardened muscles.
I believe LDP should be fixed, and observed by those who have such issues.
By the way, LDP is just a condition of the throat – not a disease. Therefor treatment and improvement of LDP is always an option.
Note1:Besides the importance of having flexibility of the muscles relevant to vocalization, it’s also important move the cricothyroid articulation and the cricoarytenoid articulation smoothly to open and close the glottis.