Lecture 9 (revised).docx

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McGill University
Kinesiology&Physical Education
EDKP 350
Celena Scheede- Bergdahl

11/27/2012 5:57:00 PM Obesity: excessive amount of body fat relative to body weight 2  BMI >30km/m Overweight: BMI 25-29.9 Underweight: BMI <18.5 Children 85-95 percentile BMI are overweight WHO: 1.6 billion adults are overweight  400 million obese Adults  Prevalence of over weight and obesity vary among countries o US: 34% obese  2/3 are overweight Children adolescents (6-19)  Canada & US: 29-35% Types of obesity  Android o Males > female o Apple shape o Localization of fat mainly upper body  Gynoid o Females > males o Pear shape o Localization of fat in lower body  gynoid less dangerous than android b/c o Location of organs o Gynoid fat associated with hormone production Causes  PIA  Over eating o Pos. energy balance: cal in > cal out o 3500 cal = 1 pound o energy store/lost depending on energy balance BMR: Basal metabolic rate  measure of minimal energy needed to maintain basic/essential physiological functions sustain life functions  varies o age o gender o body size o body composition Resting metabolic rate (REE: resting energy expenditure)  Practical alternative to BMR  Energy required to maintain essential physiological processes in relaxed, awake and reclined state TEE: total energy expenditure  (BMR or RMR) + dietary thermogenesis (energy needed for digesting, absorbing, transporting, metabolizing food) + PA  estimated via age, gender Weight management Principles  Key component: proper nutrition and PA  Management doesn’t always mean loss, client may want to gain weight (pos. energy balance)  Neg energy balance best achieved through dietary restriction & exercise  Phyiscally active lifestyle o Daily aerobic exercise  30 min mod. Inten. Most days of the week  greater health benefits obtained by engaging in more vigorous or longer duration exercise (dose- response relationship)  manage healthy body weight  60 min mod-vig most day of the week  Sustain weight loss  60-90min mod. DAILY o Strength/flexibility/stretching exercises o Resticted use of labor-saving devices o Benefits of PA in weight management  Inc. energy expenditure  Creates neg. energy balance for weight loss  Promotes fat loss preservation of LBM  Leaner people burn more calories  Maintain weight loss after dieting  Increased RMR o Types  Aerobic= most effective for weight/fat loss & long term weight management  Resistance: increased muscle mass & REE, not much weight loss  Increase fat loss when combined w/ aerobic o Weight
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