Background:Obesity is the result of long-term dietary energy intake exceeds energy consumption. How to increase the energy consumption by exercise or proper control calorie intake by
diet are the main measures taken in weight control all over the world. In city driving cars with frequent starts and stops, especially in the rush hour, often result in a significant increase in
vehicle fuel consumption, in contrast driving cars at a constant speed on highway will save fuel. In order to provide positive data support for weight control by exercise, energy expenditure and
exercise intensity of level pace running and varied pace running in college students at the same distance and average velocity was compared in the study.
Methods:Eleven college students, 9 males, 2 females, averaged 21.4 ± 0.3 years old, 67.3 ± 7.0 kg in weight, 171.0 ± 6.5 cm in height, with the same exercise level and habit, were
subjects of the study. The subjects undertook two treadmill running respectively, the first running was a level pace running of 3 kilometers at a velocity of 8 km/hour (exc-1), the second running of 3
kilometers was a varied pace running, with a velocity between 5km/hour-12km/hour which varied every 100 meters and averaged 7.97 ± 2.47km/hour (exc-2). There was a rush time of 1 week between the two
running with the same arrangements (the same time in the morning and the same treadmills). There was a 10-15 min warm up of the subjects before each running, and triaxial accelerometers （Produced by
the US company of Actigraph, model of wGT3X+） were worn at waist of the subjects. Energy expenditure, METs, step frequency, and heart rate were measured, with data sampled every 1 minute. Descriptive
statistical analysis was taken, with a significant level of P<0.05.
Results:The average heart rate (153.0 ± 28.5 b/min) and METs (9.2 ± 2.0) of the subjects during the exc-1 were significantly higher (P<0.05) than that (147.56 ± 20.3 b/min, and 8.0 ±
2.0) during the exc-2, and there was a significant difference (P<0.05) in the step frequencies (153.3 ± 17.3 vs 144.1 ± 18.4 steps/min). The energy expenditure of the subjects in exc-1 (10.5 ± 2.3
kcal/min) was significantly higher (P<0.05) than that (9.3 ± 2.2 kcal/min) in exc-2, but there was no significant difference (P=0.942) in the average velocity of exc-1(8.0km/hour) and exc-2 (7.97 ±
Conclusions: Level pace running compared with varied pace running will lead to a more energy expenditure in human, with a higher heart rate, METs and step frequency, under the
conditions of the same running velocity and distance.