Fig. 1
From: Identification of heart rate dynamics during moderate-to-vigorous treadmill exercise
Measurement protocol. a Schematic representation. During the warm-up phase, the speed was manually adjusted to achieve the moderate (\(v_1\)) or vigorous (\(v_2\)) HR intensity ("Test protocol" section). b Example raw data from formal measurement phase (0–35 min), subject S15, vigorous intensity, \(v_2=2.0 \,{\rm m}/{\rm s}.\) Horizontal bars show the evaluation period for data processing and parameter estimation (590 ≤ t ≤ 1790 s)