This logotype is very unique. Even though the word is "one" a line slashing thorough is appealing to the eye. It shows two words saying "one" the darker bold font, and the light font. It shows good use of alignment and contrast.
The chosen font along with the depiction of the heart monitor creates a very successful and effective logo type. One would easily see the heart rate as the letter U and put the rest together, A simple ye successful design.