These factors are based most often upon the rigor of your lifestyle and exercise routine. There are five activity ‘levels,’ ranging from sedentary to athletic. Your physical activity level, also known as your Thermic Effect of Exercise (TEE) is accounted for in the form of a number between 1.2 and 1.9, by which you multiply your BMR. According to an article published in Current Opinion in Clinical Nutrition & Metabolic Care in September 2006, obese and normal-weight but sedentary individuals are the most likely to overestimate their physical activity levels when compared to those who are regularly active. Most Americans over-estimate their level of physical activity. Physical activity is the most variable factor and the second largest determinant of your calorie needs. Jeor equations is the first step.Ĭhoosing the wrong physical activity level/factor (PAL) may result in an under- or over-estimation of your daily calorie needs, resulting is undesired weight loss or weight gain. Calculating your BMR using either the Harris-Benedict or Mifflin-St. Also known as Resting Metabolic Rate (RMR), this is the energy required (in calories) to fuel basic bodily functions and sustain life. When calculating your calorie requirements, you must go one-step beyond determining your Basal Metabolic Rate (BMR). Why is it important to understand physical activity? How can it affect my body weight?Įxercise frequency, intensity and workout length or duration all contribute to the number of calories you burn through physical activity weekly.
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