Boosting Exercise cApaCity With autOnomic Neuromodulation

The first allocated intervention will be undertaken for 30 minutes. The electrode placement and stimulation parameters are described in the arm/group section. After the 30-minute intervention, day 1 of the protocol will be complete. The investigator will remain present in the room with the participant to ensure compliance and adherence to the protocol. The allocated intervention will then be repeated by the participant at a similar time of day for 7 consecutive days. The investigator will arrange video-calls with the participant whilst off-site to ensure ongoing compliance and adherence to the protocol. On the seventh day, participants return to the clinical research facility to take the final first allocated intervention. A 14-day rest period will follow. Then the participants will perform the same 7-day protocol for the opposite intervention to their first treatment allocation.

Protocol as for active but sham ear leads are applied, unable to deliver current.