2max2maxMethods and systems for assessing cardio respiratory fitness (CRF) with the use of body motion data is disclosed. Specific measurements of body movement (for example motion amplitude or velocity or distance covered during repetitive displacement) are dependent on a user s fitness level. Embodiments prompt the user to execute a simple set of periodic movements which can be used to estimate cardiovascular function (e.g. VO ). Body motion data such as activity count accelerometer signals or cadence of motion is captured and analyzed to estimate the user s fitness. The combination of body motion data with various physical measurements (e.g. body weight height BMI) permits the method to predict the user s VO or similar physical fitness parameters.
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