To you, or your trainer and app?
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You: I can assure you that if you backpedal in the middle of a hard interval, you are getting worthwhile rest and recovery, even if it’s only 5-15 seconds. That amounts to a noticeable relief and can make the difference for passing or failing an interval set.
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Your trainer and app: With VP, your power comes from the wheel speed. It will show a power value anytime the wheel is moving, even if you are coasting. Despite that, the above about your physical relief will happen even if there is “power” showing.
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I don’t have VP experience and don’t know if adding a cadence sensor will alter the experience, but I don’t think it will. It might if the cadence sensor can differentiate between forward pedaling and backwards. A power meter in the pedal or crank can do this. Maybe some pure cadence ones will too? I know the simple magnetic ones can’t, but it is possible that the accelerometer base one can.
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In either case, the only possible impact is whether it can auto Pause or not. So I wouldn’t worry about it. Learn how your system works when you backpedal and apply them if and when you need to do so.