Table 1.

Periods for Data Acquisition

Period*	Description
Rest	Baseline, patient lying still supine for 15 minutes before data collection
BD #1	Blood draw #1, data collected at start of venipuncture
Pre-FS	Period prior to starting sigmoidoscopy, patient in procedure room lying still supine for 15 minutes before data collection
FS	Insertion of flexible sigmoidoscope and position at 40 cm from anal verge, data collected when sigmoidoscope first reaches appropriate location (total duration of FS ~5–10 minutes)
Post-FS	Immediately after sigmoidoscope removal from anus
BD #2	Blood draw #2, data collected at start of venipuncture

Abbreviations: FS= flexible sigmoidoscopy, BD= blood draw

^*5 minutes of ECG data collected for each period