1. 1) Chae SY: A study on cardiopulmonary Characteristics by change of backrest angle during manual wheelchair propulsion. Unpublished a master’s thesis, Daegu Univ, 2005.
2. 2) Park WH: Cardiopulmonary exercise testing: basis of the physiology. Tuberc Respir Dis, 2003, 54: 589–595.
3. 5) Keyser RE, Rodgers MM, Gardner RE, et al.: Oxygen uptake during peak graded exercise and single stage fatigue tests of wheelchair propulsion in manual wheelchair users and the able-bodied. Arch Phys Med Rehabil, 1999, 80: 1288–1292.
4. 6) Song JY: Relationship between maximal oxygen uptake on arm power, lean arm volume and grip strength in paraplegic subjects. Unpublished a master’s thesis, Kyounghee Univ, 2001.
5. 7) Kim KJ: Cardiorespiratory Adaptation to Exercise. Kor Soci Sports Medi, Clinical course book, 1999: 15–19.