There is controversy around the devices; much of the strongest objection to cochlear implants has come from the Deaf community. For some in the Deaf community, cochlear implants are an affront to their culture, which as they view it, is a minority threatened by the hearing majority. An infant with a cochlear implant.
An hour-long bike ride at a leisurely 10 to 12 miles per hour, for example, burns about 256 calories. But crank up your effort to a race pace 16 to 20 mph and you'll torch around 773. A vigorous Spinning class on an indoor bike can burn nearly as many, about 741 calories an hour.
It depends on how hard you're working, how much you weigh (and how much lean mass you have). I work near an 80% heart rate for most of my Spinning classes, and I only burn around 400-600 calories in an hour, sometimes less. There are a lot of factors at play. But a good HRM is one of the best ways to estimate how much you really burn in Spinning or in any activity for that matter.