Can you provide me with more information about sweat differences?
Sweat is secreted from glands found just beneath the skin's surface. These pores release fluid to the surface of the skin for cooling. Sweat is made up of water, sodium chloride, urea and a fatty substance secreted from the sebaceous glands which are found next to the sweat glands.
Profuse sweating can be caused from several things: genetics (as you have stated), rheumatic conditions, fever, malarial infection, pneumonia, tuberculosis and different neural problems. The use of thermogenic products can also cause excessive sweating. The thermogens increase body temperature and therefore increase calorie expenditure. In the process, the body tries to compensate for the elevated temperature (i.e., a fever) and sweats to cool off.
The inability to sweat can also be a genetic trait, but this can also be a sign of dehydration, neural problems and sometimes diabetes. The problem with not sweating is hyperthermia: elevated body temperature without the ability to cool down. This can be a problem if the temp gets high enough. It can lead to heart damage, renal deficiency and brain cell destruction. It does not mean your client is going through this destruction, but it does raise a question as to how "hot" your client is getting during a workout. This is something you have to ask your client about, and if needed, talk to their Health Care Professional (HCP) about what they think. The HCP may be able to shed some light on the matter. And, when speaking with the HCP, ask if the client is taking any medications you are unaware of. Sometimes clients forget to tell the trainer about new or changed medications.
To my knowledge, branch chain amino acids do not create an excessive elevation in body temperature. There are some prescription medicines that will elevate body temperature and the thermogenic products found OTC, as stated before. A few steps I suggest during training are make sure your clients are getting all the cool water or liquid they want, stop training if they feel ill and contact the HCP if in doubt.