Effect of endurance training on gross energy expenditure during exercise.
We compared the effect of endurance exercise training on gross energy expenditure (GEE) during steady-state exercise in 20 younger men (31.2 +/- 0.6 years) and 20 middle-aged men (49.2 +/- 1.1 years). The subjects trained for eight months. The training program consisted of three 45-min walking and jogging exercise sessions per week at an intensity of approximately 60-85% of the heart rate at peak VO2. We administered bicycle ergometer tests at 0, 4, and 8 months into training. Participants exercised at a power output of 100 W for 10 min using a pedaling frequency of 50 rpm. We determined GEE (kcal/min) by measuring the oxygen consumption and respiratory exchange ratio. We found a significant reduction (p less than 0.05) in GEE (0.7-1.3 kcal/min) following 4 months of endurance training in both age groups, with a further reduction (p less than 0.05) noted in only the middle-aged group at month 8. We found no difference (p greater than 0.05) in GEE between the younger and middle-aged men. We conclude that chronic exercise may modify GEE during a submaximal exercise bout and that this adaptation is similar in magnitude in younger and middle-aged men.
Gardner
A W
AW
Poehlman
E T
ET
Corrigan
D L
DL
D000328:Adult; D000375:Aging / Q000378:metabolism; D000704:Analysis of Variance; D001835:Body Weight; D004734:Energy Metabolism; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D010101:Oxygen Consumption; D010806:Physical Education and Training; D010807:Physical Endurance; D005082:Physical Exertion