Fig. 5From: Identification of heart rate dynamics during moderate-to-vigorous treadmill exerciseEstimated models for the four individual step changes in speed (\(v_1\) and \(v_2\) conditions combined, averages over 23 subjects). The star depicts the overall nominal model, Eq. (2). The rectangular box bounds the 95 % confidence intervals for the overall means of k and \(\tau\); the horizontal dash-dot lines mark the 95 % CI for \(\tau\) Back to article page