Brisebois, Matthew Francis2015-03-242015-03-24201411/18/2014http://hdl.handle.net/11274/4897Purpose. This study sought to compare energy expenditure, recovery VO2 and peak heart rates and VO2's achieved across 45 min of exercise and 15 min of recovery following both CrossFit® and ACSM guidelines. Methods. Thirty physically active participants performed a workout following both CrossFit® and ACSM guidelines. During each workout the participants wore a K4b2 Cosmed unit to measure energy expenditure, VO2 and heart rate. Results. Energy expenditure (468 ± 116 vs. 431 ± 96 kcal), peak heart rate (189 ± 8 vs. 172 ± 8 bpm), peak VO2 (3.22 ± 0.73 vs. 2.81 ± 0.63 L/min) and average 15 min recovery VO2 (0.89 ± 0.24 vs. 0.78 ± 0.18 L/min) were significantly greater in the CrossFit® workout (p < .05). Conclusion. CrossFit® can be an effective exercise program for expending calories, although the high intensity may be unsafe for individuals with health conditions.en-USAmerican college of sport medicineCaloricCalorieCrossfitExerciseHealth and environmental sciencesThesis