When it comes to communication, the meta message is in the tone and not in the words. Uptalk communicates a lack of conviction and confidence and can taint a public speaker's brand.
I just read an article from James Caan, CEO of Hamilton Bradshaw, entitled, Confidence is King. He writes:
I work with leaders to build confidence in all their communications and the biggest hurdle is fear of speaking. So I created a series of videos on my YouTube channel for conquering fear of public speaking: