Monitoring of Bioimpedance Data during Exercise in Cyclists (P247)

Abstract

the objective of this study was to observe if it’s possible to measure reliable bioimpedance data with our prototype during exercise, despite the movement of the body in this sport. In a second time, we wanted to investigate the reliability of fat mass measurement after exercise. Finally, we wanted to study if it is possible to observe variations of metabolism by bioimpedance during effort.

12 cyclists of the cycling club of Tour de Salvagny (TAC) participated to the study. We used two devices, a foot-to-foot impedancemeter, Tanita^® Innerscan^® for fat mass, and our prototype of multifrequency impedancemeter, BioparHom^® Z-Metrix^®, to measure the resistance (R), the reactance (X), the phase, angle and the resistances of extracellular (Re) and total body (Rinf) compartment, obtained by our model derived from Cole-Cole model. A measure was made each 1min30s during exercise. We asked cyclists to stabilise their effort at 75% of their maximal heart rate reserve during 30 minutes and then attempt a maximal effort once or twice. We showed that measurement of fat mass after exercise is not relevant, with a foot-to-foot or wrist-ankle impedancemeter using these equations in standing position, which were originally developed for standing position. We saw that during a constant effort, the signal was stable. We observed the variations of metabolism of cells’membranes thanks to phase angle parameter during maximal effort. We noted a difference in metabolic behaviour between hard training and low training subjects.

To conclude, our prototype can be reliable for monitoring bioimpedance data despite the movements during exercise but we have to modify our equations to obtain a reliable fat mass after exercise.