Physical Workload Identify in Chest Compression Position Using Surface Electromyogram

The chest compression depth decreases over time after starting continuous chest compression due to the rescuers' fatigue.

The investigators hypothesized that the frequency parameters from surface electromyogram from each muscle during chest compression may reflect the muscle fatigue of the rescuers.

Then investigators can identify which of the body are mainly used and get tired by continuous chest compression using surface electromyogram.

Inclusion Criteria:

• doctors with American Heart Association Basic Life Support (AHA BLS) provider certification
• healthy, experienced health-care providers

Exclusion Criteria:

• physical pain (ex. low back, wrist)
• heart disease