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PTRS 825 Final Exam > Exercise Phys Intro > Flashcards

Flashcards in Exercise Phys Intro Deck (28)
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1

Aging Population

29% can't walk 1300' - ~1200 to complete community errand
Sam's Club - ~2200'

2

Function Requirements for Community Living

Perform/tolerate postural transitions
Ambulate > 150' (realistically 1000'-2000') and at 1.3 m/s
Carry 6.7 lbs
Accommodation

3

Predictors of Successful Aging

ADL’s
Comorbidities (hearing, arthritis, disability)
Smoking
Cognitive function
SBP
Depression
Motivation

4

Exercise in Aging Population Focuses

Function
Overcoming fear
Frequency over intensity
Frequent monitoring
Simple, low level fitness

5

Metabolism

Sum of all chemical reactions that occur in a living organism

6

Bioenergetics

Transfer and utilization of energy in biological systems

7

1st Thermodynamic Law

Energy can be neither created nor destroyed

8

2nd Thermodynamic Law

All processes moved from ordered to disordered state

9

1st Thermodynamic Application

Energy in (food) = energy out (work) + energy out (heat) + energy stored (fat)

10

2nd Thermodynamic Application

Randomness increases but process in inefficient
70% of energy released by body is heat

11

Entropy

Measure of disorder
Solid

12

G

Chemical reactions spontaneous proceed in favorable direction

13

G>0

Thermodynamically unfavorable

14

Free Energy

Unfavorable reactions can be driven by coupling with favorable reactions
Important for driving of ATP Metabolism

15

Delta G

Determines whether chemical reaction is going to happen

16

Energy at Rest

Carbohydrates + Fat

17

Energy for Mild/Severe effort

Carbohydrates

18

Carbohydrates

Readily available and easily metabolized
Converted to glucose -> taken up by muscles/liver -> converted to glycogen
Glycogen stored in liver, converted as need
Glucose transported to muscles to form ATP

19

Carbohydrate Advantage

High energy yield (5.1 kcal/LO2)
Rapid metabolic pathway (accessed quickly)
Stores greatly increased by training and diet
Sole source of energy during heavy exercise

20

Carbohydrate Disadvantage

Stored in small amounts
Production of lactate
Once stores depleted, moderate exercise can't continue

21

Fat

Provides substantial energy during prolonged, low activity
Larger reserves than carbo
Stored as glycerol and FFA
FFA only used to form ATP
Most FFA, important for metabolism, have 12-18 Carbons

22

Fat Advantages

Greatest energy value (9.3 kcal/g)
Stable energy sources

23

Fat Disadvantages

Only metabolized aerobically
Oxidation yields less energy than CHO (4.62 kcal/LO2)
Majority of fat stored outside muscle tissue
Can't serve as only energy source

24

Protein

Energy sources id converted to glucose via gluconeogenesis
Can generate FFA in times of starvation
AA only used for energy
20% of human body is protein

25

CHO Time to Exhaustion

At 3.0 L/min (70% VO2 max), support demand for 2-2.5 hours

26

Fat Time to Exhaustion

At 3.0 L/min (70% VO2 max), support demand for 3-5 days

27

Protein Time to Exhaustion

At 3.0 L/min (70% VO2 max), support demand for 2.5 days

28

Which produces more energy?

Aerobic metabolism