. 2005 Jan 13;10(1):110–120. doi: 10.1111/j.1542-474X.2005.10103.x

Table 3.

Recommended Measurement Periods for Ambulatory ECG Monitoring of TWA

Measurement Period	Rationale
Peak heart rate	Enhanced mental and/or physical activity ²⁶ , ⁵⁰
8 am	Circadian period of heightened vulnerability to SCD ⁵⁰
Peak ST‐segment deviation from baseline	Ischemic changes may augment vulnerability to arrhythmia ⁴⁷
Maximum TWA	Ongoing daily life activities may increase arrhythmia vulnerability
Patient‐activated event marker	Exploit patients' unique awareness of increased mental and physical stress