Table 1 Overview of intervention and control group instructions, showing the respiratory rate per minute, length of each round and the average retention duration in seconds.
Round 1 | Round 2 | Round 3 | Round 4 | |||||
|---|---|---|---|---|---|---|---|---|
Breathing | Retention | Breathing | Retention | Breathing | Retention | Breathing | Retention | |
Intervention | Starts at 15 b/min increasing to 30 b/min (total: ~ 90 s) | ~ 45 s | Starts at 15 b/min increasing to 30 b/min, & then 60 b/min (~ 120 s) | ~ 60 s | Starts at 15 b/min increasing to 30 b/min, & then 60 b/min (~ 150 s) | ~ 75 s | Starts at 30 b/min increasing to 60 b/min (~ 150 s) | ~ 90 s |
Control | 15 b/min (total: ~ 125 s) | ~ 10 s | 15 b/min (~ 165 s) | ~ 15 s | 15 b/min (~ 205 s) | ~ 20 s | 15 b/min (~ 215 s) | ~ 25 s |
