ICOPPE Wellbeing Scale The I-COPPE scale(21) has 6 individual domains of interpersonal, community, occupational, physical, psychological, and economic - all of which have been individually validated against overall wellbeing. The scale asks participants to rate each of the wellbeing domains at three different time points, now, one year previously and one year in the future totalling 21 items.

Real-Time Job Demands NASA task load index (NASA TLX) is a multidimensional workload assessment tool. It contains six subscales of mental demand, physical demand, temporal demand, performance, effort, and frustration. The overall workload is derived from an average of the six subscales listed.

Real-Time Job Resources This is a six-item scale derived from the job-demands resources model of burnout. The items contained within the scale are feedback, rewards, job control, participation, job security and supervisor support.

Flow Included is a single item question asking participants "have you felt completely absorbed by a challenging but doable task". Given the paucity of literature understanding what "flow" might mean within this study population and how this may relate to HRV there is a free text box allowing participants to expand on their experience.

Fatigue The Rating of Fatigue (ROF) scale(59)is a single-item visual analogue scale.