Long-slow duration training performed at 60–80% of maximal heart rate (seldom above 160 beats min−1 for a young athlete and 140 beats min−1 for an older athlete). This form of continuous training is designed to improve aerobic endurance. It places emphasis on distance, rather than speed. Serious distance runners may run 16–32 km (10–20 miles) each day, with weekly totals exceeding 160 km (100 miles). LSD training is especially suitable for older or less fit individuals because it puts less stress on the cardiovascular and respiratory systems than high intensity exercise. If performed too often, however, it can result in overuse injuries to muscles and joints. People who use LSD training for health-related purposes or athletes using it to maintain endurance condition during the off-season, usually reduce the training distance (e.g. 5–8 km or 3–5 miles for runners).
Subjects: Sports and Exercise Medicine.