RT Journal Article
SR Electronic
T1 Progressive changes in energy cost during a three-hour race-walk exercise.
JF British Journal of Sports Medicine
JO Br J Sports Med
FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine
SP 176
OP 178
DO 10.1136/bjsm.12.4.176
VO 12
IS 4
A1 G. R. Farley
A1 E. J. Hamley
YR 1978
UL http://bjsm.bmj.com/content/12/4/176.abstract
AB Twenty experienced race-walkers were exercised in a controlled routine walking at 11.6 km/hr continuously for 3 hr, alternately on a treadmill and a cinder track. Analyses of expired air samples taken at 30 min intervals were used to calculate average R.Q. and energy expenditure. R.Q. was found to decrease progressively from 0.92 to 0.66 in the 3 hr and remained at this level 30 min later. The mean energy cost rose from 46.2 to 55.4 kJ/min or 24.7 to 29.7 kJ/min.m2. The results indicate that this group probably experienced an elevation of aerobic activity as they utilized progressively more fat to satisfy metabolic demands and that R.Q. may be a good indicator for determining recovery after severe long duration exercise.