Table 3.

Supervision of subjects in the studies included.

Author/Location/Date	Supervised or not	Ways to ensure compliance	Comments
De Barros et al., 2017	No	ABPM (Ambulatory blood pressure monitoring) using Mobil-O-Graph NG device (IEM, Germany) was used to monitor blood pressure remotely
Shetty et al., 2017	Yes
Li et al., 2017	Yes
Kow et al., 2018	No	Asked them to record the time and duration of their practice in a record book given to them	The authors also report that the lack of supervision may affect the quality of the breathing exercise and compliance for the same
Ublosakka- Jones et al., 2018	No	Subjects were given a checklist on which they recorded the time and duration of the exercise and heart rate and blood pressure after the exercise.	Contacted via telephone once a week and were encouraged to do the exercise. The subjects were asked to record the details of their session like time, duration and any side effects.
Kalaivani et al., 2019	Yes
Lachowska et al., 2019	No	Used a RESPeRATE device	They were called weekly via a trainer and obtained various information about the time, duration and vital parameters from the device.
Misra et al., 2019	No	The subjects logged their time and duration of the exercise and submitted their logs once a week.
Srinivasan et al., 2019	Yes
Fetter et al., 2020	Yes
Ghati et al., 2021	Yes
Sathe et al., 2020	No	No mention of compliance
Thanalakshmi et al., 2020	Yes
Dhungana et al., 2021	Yes
Craighead et al., 2021	Yes