To prevent motion artifacts and excessive pressure on the electrodes the sensor should fit snugly around the wrist or palm. The fit should not be so tight that it constricts blood flow or turns your fingers purple. If the fit feels uncomfortable then wiggle the sensor around to a better position or loosen it until it feels good. Neither should the fit be loose enough that the sensor is able to rotate around freely on its own, as this will cause motion artifacts to appear in the data. If you see a lot of “spiking” like in the example here then the sensor is either too loose or is placed over a region that is moving a lot (where the sensor can pull away from the skin) and should be moved to a more stable, but still comfortable, position.
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Fig.1 Brown=right leg, Blue = left leg, Motion=brown; Gray walking period up/down stairs is maximum activation (9 minutes)