1. Geoffrey E, Moore J, Larry Durstine, Patricia L, Painter American College of Sports Medicine ACMS’s exercise management for persons with chronic diseases and disabilities/American College of Sports Medicine. Champaign, IL: Human Kinetics; 2016
2. Walter R, Thompson, Neil F, Gordon Linda S, Pescatello, American College of Sports Medicine ACSM’s guidelines for exercise testing and prescription/American College of Sports Medicine. Philadelphia: Wolters Kluwer Health/Lippincott Williams and Wilkins; 2014. p 480
3. Augsburger S, Tylkowski C (2000) A comparison of volumetric oxygen consumption to gait mechanical energy in normal and pathological gait. In: Harris GF, Smith PA (eds) A new millennium in clinical care and motion analysis technology. Institute of Electical and Electronics Engineers, Piscataway, pp 109–115
4. Bar-Haim S, Belokopytov M, Harries N, Frank A (2004) A stair-climbing test for ambulatory assessment of children with cerebral palsy. Gait Posture 20:183–188
5. Battley E (1995) The advantages and disadvantages of direct and indirect calorimetry. Thermochem Acta 250:337–352