正文
The study looked at seven fitness trackers worn on the wrist:
They were Apple Watch, Basis Peak (version 1), Fitbit Surge and Microsoft Band (version 1). The others three were Mio Alpha 2, PulseOn, and Samsung Gear S2.
Sixty participants of both sexes wore up to four trackers on their wrists as they sat, and as they exercised on a treadmill and a
stationary
bike. The participants were a mix of sizes and fitness levels.
The trackers measured the heart rates and energy used, or calorie burn, in activities from sitting to a slow walk to a run. They also tested people cycling at different speeds.
Professional medical instruments measured participants' heart and breathing rates as well as temperature and blood pressure. The researchers compared the fitness tracker measurements to those of the "gold standard medical instruments."
Energy expended (EE)
