Figure 4

The curve of the systolic isovolumic contraction force variation as a function of heart rate is finally computed. All the parameters are acquired as instantaneous values at baseline and during stress; mobile mean is utilized to assess baseline value (1 minute recording), at each incremental stress test, at peak test, and during recovery. The data can be also read remotely by a telemetric connection. Left panel: instantaneous force values scattering (red points) depend on the respiratory cycle and thorax expansion; blue curve = force mobile mean. Right panel: blue curve = exercise in progress; red curve = recovery.