According to the CDC, obesity continues to be a problem for adults and adolescents. It is important to find accessible activities that provide an opportunity for caloric expenditure. Running and walking are activities that most people can perform without great expense.
PURPOSE: To examine the differences between males and females on energy expenditure during a one mile walk and a one mile run.
METHODS: 15 males and 15 females between the ages of 18 - 30 years (21.90±2.52 years) were recruited from college classes. The average height of the participants was 168.89±11.20 cm, the average weight was 71.01±17.30 kg, the average BMI was 24.57±3.89 kg/m2, and the average VO2max was 41.51±6.31 ml/kg/min. After signing an informed consent, each participant completed a VO2max test. Participants were randomly assigned to run one mile at 6 miles per hour (mph) and walk one mile at 3 mph on two separate days. Data collected included VO2max, energy expenditure (EE), and respiratory exchange ratio (RER). EE was collected for 15 minutes prior to exercise and during exercise.
RESULTS: There was no difference in age between males and females. Males were taller, weighed more, and had a higher maximal VO2 than females. The average walk and run EE was higher for males than females (5.04, 12.86 kcals/min and 3.86, 9.66 kcals/min respectively). Total EE for running one mile was 128.6 kcals and 96.6 kcals and walking was 100.8 kcals and 77.2 kcals for males and females, respectively. Overall, the average (RER) was different for walk and run (0.89 and 0.98, respectively).
CONCLUSION: Fitness professionals are always attempting to identify the most effective modality to maximize energy expenditure. Running yields a greater number of kcals expended covering the same distance compared with walking in less time. At the level of EE in the current study, running at 6 mph would cause a total EE of 1,930 kcals for males and 1,458 kcals for females running 5 days a week for 30 minutes each day. Walking at 3 mph would cause a total EE of 755 kcals for males and 580 kcals for females walking 5 days a week for 30 minutes each day. Running will yield a higher caloric expenditure. During running, more of the calories expended are carbohydrates.