2.7. Heart Rate Monitor
GDM
GDM
The participants wore a heart rate monitor chest strap (Polar, Kempele, Finland) during their walking sessions to confirm they were in the prescribed intensity range (121–146 bpm). The chest strap is worn around the chest, with the sensor placed just inferior to the sternum. It wirelessly connects to the Polar Beat mobile application (downloaded through the Apple App Store or Google Play), which displays the heart rate in beats per minute (bpm). This device was returned to the researchers at the end of the study period. Due to technical barriers, the heart rate was only documented via Polar Flow for 17 participants in total (GDM, 