Especially for freelance trainers who are thoroughly dependent on their voice, this is a big deal. It's scarier if you are diagnosed with laryngitis or bronchitis. That is a month or two worth of income, excluding medical costs.
I found some tips that can help us in maintaining a healthy voice. It's high time I adopt these. Can't afford another incident honestly.
1. Drink water to keep your body well hydrated.
2. avoid alcohol and caffeine.
3. Allow yourself several "vocal breaks" especially during periods of prolonged use.
4. Don't smoke.
5. Don't yell or scream.
6. Don't clear your throat too often. When you clear your throat, it's like slamming your vocal cords together. Doing it too much can injure them and make you hoarse. Try a sip of water or swallow to quench the urge to clear.
7. When you're sick, spare your voice.
8. When you have to speak publicly, to large groups or outdoors, think about using amplification to avoid straining your voice.
YES! some of you might say that it's the same advice singers are given. Well, first of all, there are similarities between singing and training.
If you need more detail, drop by the following site. http://www.livescience.com/4078-10-tips-healthy-voice.html
Hope it helps..