Anaerobic Capacity

By the Watta Team · Updated

Anaerobic Capacity: Anaerobic capacity is the total amount of energy the body can produce through anaerobic (non-oxygen) pathways, determining sprint performance and finishing speed in rowing.

What is Anaerobic Capacity?

Anaerobic capacity refers to the total work your body can perform using energy systems that do not require oxygen — primarily the phosphocreatine system (first 10-15 seconds) and anaerobic glycolysis (up to 60-90 seconds). In rowing, anaerobic capacity determines: sprint performance (100-500m), the starting burst in a 2K race, and the finishing sprint. The 2K test is approximately 20-25% anaerobic. Anaerobic capacity is developed through short, maximal intervals: 10 x 100m with full rest, 8 x 250m with 3:00 rest, and sprint starts. It is trainable but has a lower ceiling than aerobic capacity — most improvement in 2K times comes from aerobic development rather than anaerobic gains.

How Watta Uses Anaerobic Capacity

Watta captures the high peak watts generated during anaerobic efforts. The Work Output component of the Effort Score reflects the power produced during sprint sessions, while the Cardiac Load tracks the cardiovascular response to anaerobic work.

Further Reading

Frequently Asked Questions

How important is anaerobic capacity for a 2K?
The 2K is approximately 75-80% aerobic and 20-25% anaerobic. Anaerobic capacity determines the start (first 10-15 strokes) and the finishing sprint (last 250m). However, aerobic capacity is far more important for overall 2K time.
How do I train anaerobic capacity?
Short, maximal intervals with full recovery: 10 x 100m with 3:00 rest, 8 x 250m with 3:00 rest, or 6 x 30 seconds max effort with 4:00 rest. These sessions should be truly maximal and fully rested between repeats.
Can I have too much anaerobic training?
Yes. Anaerobic training creates high neuromuscular fatigue and should not exceed 5-10% of total training volume. Too much anaerobic work without adequate aerobic base leads to "being fast but not fit" — good sprint but poor sustainable pace.

Related Content

VO2 Max (Rowing)VO2 max in rowing is the maximum rate of oxygen your body can use during exercise, measured in mL/kg/min, and is the strongest predictor of endurance rowing performance.Lactate ThresholdLactate threshold in rowing is the exercise intensity at which blood lactate begins to accumulate exponentially (approximately 4 mmol/L), representing the upper boundary of sustainable aerobic effort.Erg SprintAn erg sprint is a maximal effort rowing piece over a short distance (100-500m) or time (under 2 minutes), used for testing peak power and anaerobic capacity.Erg IntervalsErg intervals are structured rowing workouts alternating between high-intensity work periods and rest or low-intensity recovery periods, designed to develop speed, power, and anaerobic capacity.Peak WattsPeak watts is the highest power output recorded in a single stroke on a rowing ergometer, reflecting your maximum explosive power.Split to Watts ConverterRowing Pace CalculatorErg Interval WorkoutsHow to Improve Your 2K TimeFor Competitive RowersFor FirefightersFor Rugby Players250m Sprint Repeats
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