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Lecture 5

HLSC 1F90 Lecture Notes - Lecture 5: Hydrostatic Weighing, Ketosis, Hypertrophy


Department
Health Sciences
Course Code
HLSC 1F90
Professor
Brent Faught
Lecture
5

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Lecture 5 Weight Management
[Hay et al. (2002)]
Females Desire to change weight by body fat groupings (12-13 years of age)
< 20 % BF
20 25% BF
>25% BF
Wanting to lose weight
24
21
41
Wanting to maintain weight
8
12
3
Wanting to gain weight
10
4
0
Males Desire to change weight by body fat groupings (12-13 years of age)
<20 % BF
20-25% BF
>25% BF
Wanting to lose weight
17
2
17
Wanting to maintain weight
38
3
1
Wanting to gain weight
34
4
0
Female Perceptions of their weight (12-13 years of age)
Under weight
Just right
Over weight
Wanting to lose weight
8
26
72
Wanting to maintain weight
14
34
1
Wanting to gain weight
12
4
0
Male Perceptions of their weight (12-13 years of age)
Under weight
Just right
Over weight
Wanting to lose weight
2
8
38
Wanting to maintain weight
10
35
6
Wanting to gain weight
31
14
0
*Vast majority of Females want
to lose weight if under, over, or
just the right weight
*Males who are underweight all
want to change or maintain
whether it be gaining or losing
more weight
*Females who think they
are underweight want to still
lose or maintain weight, and
females who are the
appropriate weight also still
prefer to lose weight
*In males there is an even
and appropriate distribution
in OV wanting to lose
weight, UW wanting to gain
weight, and males with the
appropriate weight wanting
to stay the same
After calculating their BMI the greater population of females where
wanting to lose weight across the board, but when told what the
numbers meant; some girls who are UW or just right still wanted to
lose weight, or girls who are UW wanted to maintain being UW.
wanted to lose weight, gain weight, or maintain it, but when told what
the numbers meant; the boys showed a normal distribution. (OV=lose
weight, UW=gain weight, JW= maintain)
Therefore, Males show the appropriate response in weight
management, where females are always striving to be thinner than
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Calorie Balance
Normal Calorie intake is 2000 calories per day
Goal is to create a positive energy balance
Over weight (OV) and Obesity (OB)
Definitions:
Over weight (OV): Weight greater than expected for a specific height
Obesity (OB): Excessive accumulation of body fat that increases the risk for health problems
Essential Fat: Fuel for your body, protection for organs, nerve conduction or insulators
3-7% male total body weight
10-15% female total body weight (higher due to hormone flux and body structure)
Stored fat: Too much or too little fat
Gender
Normal
OV
OB
Male
11-17%
17%
19% or over
Female
16-24%
24%
29% or over
*** In Canada over 50% of population are OV or OB
Strong correlation with risk of ill health in OV/OB individuals:
Atherosclerosis / Coronary Artery disease
Hypertension
Colon/Breast Cancer
Type 2 Diabetes
Determining the right weight for you:
Body Mass Index (BMI): Weight (kg)/Height(m squared)
Adults BMI classification 30.1-34.9
18.5-24.9 is considered healthy
>25 = OV
>30 = OB
Class I = 30.1-34.9, Class II = 35-39.9, Class III = >40
Calorie Output-
used to maintain
body function
Intake calories from
food
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