1. 1) Katch VL, McArdle WD, Katch FI:Energy expenditure during walking, running, and swimming, Chap 8 Energy expenditure during rest and physical activity. Essentials Exercise Physiology 4th ed. Lippimcott Williams & Wikins, Philadelphia, NewYork, 2011;pp 246-261
2. 2) Bard G, Ralston HJ:Measurement of energy expenditure during ambulation, with special reference to evaluation of assistive devices. Arch Phys Med Rehabil 1959;40:415-420
3. 3) Campbell J, Ball J:Energetics of walking in cerebral palsy. Orthop Clin North Am 1978;9:374-377
4. 4) Hirschberg GG, Ralston HJ:Energy cost of stair-climbing in normal and hemiplegic subjects. Am J Phys Med 1965;44:165-168
5. 5) Corcoran PJ, Jebsen RH, Brengelmann GL, Simons BC:Effects of plastic and metal leg braces on speed and energy cost of hemiparetic ambulation. Arch Phys Med Rehabil 1970;51:69-77