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Del Percio, Claudio. “‘Neural Efficiency’ of Athletes' Brain for Upright Standing: A High-Resolution EEG Study.” Elseveir, 79, 193-200. (need to fix this citation)
Sharma, S. (2003). Athlete’s heart - effect of age, sex, ethnicity and sporting discipline. Publication of The Physiological Society, 665-669. doi:????
Teh, K.C., & Aziz, A.R. (2002). Heart rate, oxygen uptake, and energy cost of ascending and descending the stairs. Medicine & Science In Sports & Exercise, 695-699. doi:0195-9131/02/3404-0695/$3.00/0
Weingarten, G. (1973). Mental performance during physical exertion: The benefit of being physically fit. International Journal of Sport Psychology, 4, 16-26.