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Single camera and two camera assessments use different underlying models to produce 3D data. Because of that, some specific numbers may differ slightly in their measurements between one camera and two camera captures. If you’re switching between one camera and two camera assessments for the same athlete over time, keep this in mind. A difference in a number between the two doesn’t mean something has changed about the athlete.

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Example:

You assessed an athlete’s swing using two camera capture a month ago and have decided to use one camera capture for their current assessment. Comparing things like sequence order, and whether or not the athlete is drifting forward or leading the swing with their wrists, should be relatively safe. However, seeing a decrease or increase (for example, 60 degrees per second) in the athlete’s peak pelvis velocity between assessments may not directly be an indicator of their speed increasing or decreasing, but could be natural variance between the one camera and two camera models. Both capture modes are useful, and we encourage the exploration and use of one camera assessments as we continue to offer expanded movement support. One tip for either mode: capturing more reps in an assessment (e.g. 8-10 swings rather than 2-3) can help smooth out outliers and give a clearer picture of how the athlete is moving consistently across reps.