Zitat
Abstract
Understanding how body position changes affect bioimpedance is essential for improving wearable technology. This study assessed the influence of posture and time-related changes on whole-body bioimpedance in 12 volunteers, who maintained sitting, standing, and supine positions for 15 minutes each. Changes in body position influenced bioimpedance. Transitioning from standing to sitting led to an average bioimpedance decrease of -2.97 ± 1.19%, which reversed when returning to a standing position. Moving to a supine position resulted in an initial increase of in average 2.55 ± 1.15%, followed by a further rise to 4.25 ± 0.91% over 15 minutes. These results are consistent with previous studies and confirm that deviations from standard clinical positions influence the results of BIA measurements. The study highlights the need to adapt BIA for non-standard positions to optimize and ensure accuracy. Key factors such as hydrostatic pressure on the change in fluid distribution need to be considered in portable BIA applications, and future research should incorporate correction models where appropriate.