1) Csuka M, McCarty DJ: Simple method for measurement of lower extremity muscle strength. Am J Med, 1985, 78: 77-81.
2) Bohhanon RW: Alternative for measuring knee extension strength of the elderly at home. Clin Rehabil, 1998, 12: 434-441.
3) Newcomer KL, Krug HE, Mahowald ML: Validity and reliability of the timed-stands test for patient with rheumatoid arthritis and other chronic diseases. J Rheumatol, 1993, 20(1): 21-27.
4) Cheng PT, Liaw MY, Wong MK, et al.: The sit-to-stand movement in stroke patients and its correlation with falling. Arch Phys Med Rehabil, 1998, 79(9): 1043-1046.
5) Bohhanon RW, Smith J, Hull D, et al.: Deficits in lower extremity muscle and gait performance among renal transplant candidates. Arch Phys Med Rehabil, 1995, 76: 547-551.