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Fig. 3 | Pilot and Feasibility Studies

Fig. 3

From: Fit for Surgery—feasibility of short-course multimodal individualized prehabilitation in high-risk frail colon cancer patients prior to surgery

Fig. 3

a, b Examples of different issues within training sessions based on maximum heart rate. a Examples of training sessions with continuous measurement of heart rate and Borg’s RPE for three different patients. Horizontal lines represent the time within the interval spent above 90% of maximum heart rate (HR) within each interval. Patient 1 (red) represents the expected course of the HR during a training session. Patient 2 (blue) shows a training session where the HR did not decrease between high-intensity intervals. Patient 3 (orange) shows a patient with known paroxysmal atrial fibrillation, which is suspected to have atrial fibrillation during the training. HR was above 100% of the maximum HR completely during the session. HR during the last 4 min of training was not registered. b Illustrative example of a high-intensity interval training bout of a frail patient with colonic cancer without an expected decrease in heart rate between high intensive interval bouts. Similar to patient two (blue) in Fig. 2 a. The example was produced on Lode Corival rehab ergometer bike (Lode B.V., Groningen NL) on a patient not included in the feasibility study, in order to show the missing decrease in HR in correlation to intervals on a similar patient. The measure of Watt (green line), revolutions per minute (RPM (blue line)), heart rate (beats per minute, BPM (red line)), by time in minutes (x-axis). Oxygen saturation (SpO2) was not measured. The resting pulse of 75, increased rapidly after the start of the bout, even on 30% of maximum wattage defined by CPET, and reached maximum pulse within the first minute of exercise. The pulse did not decrease in low-intensity phases. CPET, cardiopulmonary exercise test. RPE, Borg’s Rating of Perceived exertion (RPE) 6-20 scale

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