What does it mean that a Stationary bike gives off 30000 Watts?

[cophmaster]

I hear people talking about how many Watts things like stationary bikes can produce. I am just wondering what this means.

 

[themrmike]

i haven't a clue but competition bicyclist require 5-8000 calories per day when racing they operate at about a 500 calorie per hour deficit.
7000 calories factored (1 wattsecond = 0.238 902 957 62 calorie [15° C])
equals only a bit over 1649 what seconds. so i do not know where the 30000 comes in. tmm