1. Asmussen E, Heeboll-Nielsen K (1965) Communications from the Testing and Observations Institute of the Danish National Association for Infantile Paralysis, no 20
2. Bassey EJ, Bryant JC, Clark E, Fentem PH, Jones PRM, Macdonald IA, Patrick JM (1979) Factors affecting cardiac frequency during self-paced walking: body composition, age, sex and habitual activity. J Physiol (Lond) 291: 46P
3. Bassey EJ, Fentem PH, MacDonald IC, Scriven PM (1976) Self-paced walking as a method for exercise testing in elderly and young men. Clin Sci Mol Med 51: 609?612
4. Cotes JE, Berry G, Burkinshaw L, Davies CTM, Hall AM, Jones PRM, Knibbs AV (1973) Cardiac frequency during submaximal exercise in young adults; relation to lean body mass, total body potassium and amount of leg muscle. Q J Exp Physiol 58: 239?250
5. Cotes JE, Hall AM, Johnson GR, Jones PRM, Knibbs AV (1974) Decline with age of cardiac frequency during submaximal exercise in healthy women. J Physiol (Lond) 238: 24?25P