Advanced Aerobic Workshop Walk/Run Calculator - This calculator uses the ACSM prediction calculations

Cycle Calculator - Input Watts and weight to find VO2. This calculator uses the ACSM prediction calculations
Rowing V02max predictor - Use your weight and best 2000m time

Ekblom-Bak test - Ekblom-Bak app - 

General Indications for stopping an exercise test
  • Onset of angina or angina-like symptoms.
  • drop in systolic BP of >10mmHg from baseline BP despite an increase in workload.
  • Excecssive rise in BP: systolic >250mmHg or diastolic >115mmHg.
  • Shortness of breath, wheezing, leg cramps or claudication.
  • Signs of poor perfusion: light-headedness, confusion, ataxia, pallor, cyanosis, nausea, or cold and clammy skin.
  • Failure of heart rate to increase with increaed exercise intensity.
  • Noticeable change in heart rhythm.
  • Subject requests to stop
For a full list of absolute and relative contraindications see: 
American College of Sports Medicine. (2013). ACSM's guidelines for exercise testing and prescription. Lippincott Williams & Wilkins.

Further Reading
Eston, R. & Reilly, T. (Ed.) (2009). Kinanthropometry and exercise physiology laboratory manual. Vol. 2: Physiology. (3rd Ed). London, Routledge