Heart Rate Zone
Definition
Ranges of heart rate intensity during exercise, expressed as percentages of maximum heart rate, used to optimize training for specific fitness goals.
Formula
Max Heart Rate (estimated) = 220 - ageHeart rate zones divide exercise intensity into five ranges based on percentages of your maximum heart rate (MHR). Zone 1 (50-60% MHR) is light recovery, Zone 2 (60-70%) builds endurance, Zone 3 (70-80%) improves aerobic capacity, Zone 4 (80-90%) increases threshold, and Zone 5 (90-100%) is maximum effort.
Training in different zones targets different physiological adaptations. Zone 2 training, often called the fat-burning zone, is where the body uses the highest percentage of fat for fuel. Higher zones improve cardiovascular performance, lactate threshold, and VO2 max but are more demanding on the body.
Most fitness experts recommend spending 80% of training time in Zones 1-2 and only 20% in Zones 3-5, known as the 80/20 polarized training approach. This balanced approach builds a strong aerobic base while including enough high-intensity work to drive performance improvements without overtraining.
Related Calculators
Related Terms
Resting Heart Rate
healthThe number of heartbeats per minute while at complete rest, serving as an indicator of cardiovascular fitness and overall heart health.
VO2 Max
healthThe maximum rate of oxygen consumption during exercise, considered the gold standard measure of cardiovascular fitness and aerobic endurance.
HIIT (High-Intensity Interval Training)
healthA training method that alternates short bursts of intense exercise with brief recovery periods, delivering significant cardiovascular and metabolic benefits in less time.
TDEE (Total Daily Energy Expenditure)
healthThe total number of calories your body burns in a day, combining basal metabolic rate, physical activity, and the thermic effect of food.
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