SATURDAY, July 17 (HealthDay News) -- Exposure to high levels of traffic air pollution among people with heart or lung disease is associated with reduced heart rate variability (HRV), a risk factor for sudden cardiac death, finds a new study.

SATURDAY, July 17 (HealthDay News) -- Athletes at high risk for anterior cruciate ligament (ACL) injury can be identified through a simple, inexpensive method that can be done in a doctor's office, according a new study.