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FW275 Exercise Physiology
- 1. © 2010 McGraw-Hill Higher Education. All rights reserved.
Chapter 2
Exercise Physiology
- 2. © 2010 McGraw-Hill Higher Education. All rights reserved.
Introduction to
Exercise Physiology
Physiology
The study of human function
Molecular level or whole organism level
Exercise
Form of physical exertion that can be carefully
quantified
Exercise duration, intensity, type/mode, frequency
- 3. © 2010 McGraw-Hill Higher Education. All rights reserved.
Exercise Physiology
Definition:
the study of how the body functions during physical
exertion that is carefully quantified
Exercise science curriculum incorporates exercise
physiology as an upper level course (junior or
senior) in addition to the study of biology,
chemistry, anatomy & physiology,
- 4. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
Field has evolved through findings of several
different scientists
1700’s Antonie Lavoisier
Discovery that oxygen uptake increased with physical
exertion
Mid to late 1800’s Fernand LaGrange—1st
textbook
The Physiology of Bodily Exercise
1879 Dudley Sargent
Developed a physical fitness program at Harvard
University based on individual prescription
- 5. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
1891 George Fitz
Exercise physiology laboratory created at Harvard.
Courses in exercise physiology and laboratory research
were instructed. This combination is continues today.
20th
Century
Finding that muscle activity is powered by carbohydrate not
heat (previously believed)
1900’s prominent researchers traced to Europe
Founded 1954
1920 August Krogh, Danish physiologist
Studied muscle activity and blood flow, Noble Prize
- 6. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
1920’s
Archibald Vivian Hill, British physiologist
Nobel Prize, studied muscle force and movement speeds
Pioneer in studying VO2 responses pre and post running
John Haldane, European physiologist
Influential development of respiratory gas analyzer
Studied carbon dioxide on breathing regulation
Otto Meyerhof, German physiologist
Shared Noble Prize with Hill
Conducted studies on energy metabolism
- 7. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
1927 David B. Dill, biochemist from Stanford
Harvard Fatigue Laboratory, legendary
accomplishments in exercise physiology.
Studied the physiological, psychological, sociological
factors with manual work.
Research in metabolic responses to exercise,
environmental stress, aging induced changes, blood-
gas and acid-base chemistry
Remained open for 20 years
Fundamental in the spread of the field along with many
European researchers
- 8. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
Same timeline as Harvard Fatigue Laboratory European researchers:
Erik Howhu-Christensen
One of 1st
researchers to study fuel patterns during exercise
Became faculty at Gymnastik-och Idrottshogskolan in Stockholm and
mentor to many great researchers
Per-Olof Astrand,
The Textbook of Work Physiology
Astrand-Rhyming Submaximal Exercise Test
Ehrling Asmussen and Marius Nielsen
Joined faculty University of Copenhagen
Asmussen focus was exercise and muscle function
Nielsen studied temperature regulation with exercise in hot and cold
environments
Bengt Saltin
Leading contemporary exercise physiologists
- 9. © 2010 McGraw-Hill Higher Education. All rights reserved.
History—Exercise Physiology
1950’s
American College of Sports Medicine
1954 held first scientific meeting
Goal was to expand the knowledge of exercise
responses in humans
Atherosclerosis
Evidence from the Korean War that young male
casualties showed evidence of coronary artery
disease
CVD problems were thought linked to aging, findings
revealed that disease develops early in life
- 10. © 2010 McGraw-Hill Higher Education. All rights reserved.
General Course Content
Energy
Nervous
Endocrine
Skeletal muscle
Cardiovascular
Respiratory
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The Energy Systems
Energy for exercise is derived from the
breakdown of stored resources
Fat and carbohydrate (protein not primary source)
Chemical reactions transfer potential to ATP
ATP—adenosine triphosphate
ATP is the body’s usable form of energy
- 12. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Energy Systems
ATP is degraded to adenosine diphosphate
(ADP) and inorganic phosphate (Pi)
Muscles can use three different pathways to
make ATP
Phosphagen
Glycolytic
Oxidative
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The Energy Systems
3 energy pathways
Anaerobic pathways: phosphagen and glycolytic
Do not require oxygen
Occurs in cell’s cytoplasm
Phosphagen pathway
Phosphate molecule is transferred to ADP to make ATP
Glycolytic pathway
Requires more steps, involves the breakdown of a glucose to
produce ATP.
Results in formation of ATP and pyruvate
Not useful for prolonged exercise
- 14. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Energy Systems
3 energy pathways
Aerobic pathway: oxidative pathway
Oxidation occurs in mitochondria
Requires oxygen
Glycolysis and Kreb’s cycle oxidizes glucose (from
carbohydrate) or fatty acid (breakdown of stored fat)
and is completed with the electron transport chain to
produce ATP
Provides energy for endurance activities
- 15. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Energy Systems
Exercise Training
Specific energy pathways in the muscle can be enhance
with training
Anaerobic (sprint) training increase cell’s ability to
produce energy from the phosphagen and glycolytic
pathways
Aerobic (endurance) training will increase the ability to
synthesize ATP via oxidation
Will increase muscle glycogen concentration
Enhance ability of muscle to resist fatigue during prolonged
exercise
- 16. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Nervous System
Primary control system for physiological
function
Brain, spinal cord, all peripheral nerves
Central Nervous System
Brain and spinal cord
Peripheral Nervous System
All neurons that transmit information to (sensory
branch) and from (motor branch) the spinal cord
- 17. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Nervous System
Peripheral Nervous System
Somatic nerves
Sensory information (consciously sensed) light, taste,
touch, sound
Voluntary motor transmission
Skeletal muscles
Autonomic nerves
Not consciously controlled: pressure, chemical
changes, heart, lungs, blood vessels, organs of
digestion
Sub-divided: parasympathetic and sympathetic
- 18. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Nervous System
Autonomic Nerves
Parasympathetic
Autonomic regulation at rest
Sympathetic
Activated during stress such as exercise
Example of autonomic function:
One goes from resting position to increasing exercise
intensities.
- 19. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Nervous System
Exercise training can alter nervous system function
Strength training
Adaptations in skeletal muscle to increase strength and recruitment
of muscle fibers through the nervous system
Endurance training
Can reduce the amount of sympathetic activation during submax
exercise since endurance training reduces the overall stress on the
body during exercise
Exercise can alter both somatic and autonomic nerves
- 20. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Endocrine System
Glands secrete hormones into the blood
Works with the nervous system to regulate
physiological function through hormones and
glands.
Hormones travel through circulation to their
target organ
Hormones bind to receptors and initiate cell
activity
- 21. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Endocrine System
Hormones and exercise
Pituitary gland
With exercise secretes growth hormone which influences fuel use
with exercise
And antidiuretic hormone will increase water conservation during
exercise
Adrenal gland
Cortex secretes cortisol and alodosterone
Medulla secretes epinephrine (adrenaline) and norepinephrine
(noradrenaline)
Pancreas
Secretes insulin hormone in response to increase blood glucose
levels
Exercise causes insulin levels to decline
Secretes glucagon hormone when there is a decrease blood
glucose levels
Glucagon increases the amount of glucose formed and released by the liver
- 22. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Endocrine System
Exercise training response to the endocrine
system
Endurance training
Reduce the release of epinephrine & norepinephrine
Resistance training
May influence the body’s response to the hormones
testosterone, insulin-like growth factor-I, and cortisol
Due to increase muscle mass
- 23. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Skeletal Muscle System
Comprises 40% of total body mass
Together with nervous system, provides movement
Functional unit of muscle is the muscle fiber
Single muscle fiber is comprised of sacromeres
Sacromeres contain the contractile elements actin
and myosin
Once activated by neural stimulation, myosin and
actin filaments attach and pull toward the
sacromere
Then, muscle fiber shortens and force is generated
- 24. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Skeletal Muscle System
Human skeletal muscle is comprised of 3
different types of fibers
Slow twitch (Type I)
Good endurance
Reliance on oxidative metabolism to produce ATP
Fast twitch (Type IIa)
Combination of good endurance and power
Fast twitch b (Type IIb)
Most powerful fibers, poor endurance
- 25. © 2010 McGraw-Hill Higher Education. All rights reserved.
Skeletal Muscle Fiber Type
Classification Schemes
Twitch Term Energetic
Term
Color Term Generic
Term
Slow twitch (ST) Slow, oxidative
(SO)
Red Type I
Fast twitch a (FTa) Fast, oxidative,
glycolytic (FOG)
Intermediate Type IIa
Fast twitch b (FTb) Fast glycolytic
(FG)
White Type IIb
- 26. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Skeletal Muscle System
Exercise training response can impact
system
Aerobic training
Will increase endurance capacity of all three fiber
types
Strength training
Will not change muscle fiber but will result in increase
in strength due to increase in muscle mass
- 27. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Cardiovascular System
Delivers oxygen and nutrients and removes
carbon dioxide
Consists of heart, blood vessels and blood
Exercise will affect each component
HR x SV = Q
Exercise increases Q
Increase in Q and HR directly proportional to
exercise intensity
Increase in Q increase BP
- 28. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Cardiovascular System
HR—heart rate
SV—stroke volume
Amount of blood pumped out of heart with each beat
Q—cardiac output
Vasoconstriction occurs in arterial blood vessels in
viscera
Vasodilation occurs in blood vessels of working
skeletal muscles
This causes changes in blood flow patterns,
shunting more blood to working skeletal muscles
- 29. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Cardiovascular System
Exercise training response
Aerobic training
Heart pumps stronger
Blood volume expands
Increase in capillaries
Submaximal exercise: HR decreases and SV increases
Maximal exercise: HR unchanged or decreases, SV
increases, Q increases
- 30. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Respiratory System
Lungs responsible for ventilation and
diffusion
Comprised of lungs and airways that conduct
air flow into the lungs
Ventilation—process of drawing air into the
lungs
Diffusion—process of oxygen and carbon
dioxide are exchanged between blood and
alveoli (inner most region of lung)
- 31. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Respiratory System
Airways that conduct air in and out of lungs
dilate, this reduces resistance to air flow.
Additional airways open and increases
ventilation
Diffusion of oxygen and carbon dioxide
between alveoli and capillaries occurs due to
pressure differences
- 32. © 2010 McGraw-Hill Higher Education. All rights reserved.
The Respiratory System
Exercise training responses
Aerobic training
Increase maximal capacity of lungs to increase tidal
volume and respiratory rate
Training will enhance the rate of oxygen diffusion out
of the lungs and into the blood
Respiratory system and cardiovascular system both
increase capacity with increasing exercise intensities
- 33. © 2010 McGraw-Hill Higher Education. All rights reserved.
Additional topics studied
Nutrition for health and
performance
Body composition
techniques
Physiological response
to environmental stress
Exercise testing
protocols
Exercise prescription
models
Exercise responses in
special populations
Exercise and aging
Pediatric exercise
responses
Exercise effects gravity
Sports training &
performance
Metabolic disorders
Bone health
- 34. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
Students should investigate possible
organizations that fit the need for their future
direction
Certifications can be important for many job
descriptions
Many employers in the clinical, education,
health promotion fields are looking for
candidates with both strong academic
standing with certifications
- 35. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
American College of Sports Medicine
(ACSM)
Various specialties: medical doctors, allied
health professionals, fitness professionals,
exercise physiologists, biomechanists, sport
psychologists, athletic trainers
Journals
Medicine and Science in Sports and Exercise
Exercise and Sport Sciences Reviews
Health & Fitness Journal
- 36. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
ACSM certifications
ACSM Certified Personal Trainer
ACSM Certified Health Fitness Specialist
ACSM Certified Clinical Exercise Specialist
ACSM Registered Clinical Exercise Physiologist
- 37. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
National Strength and Conditioning Association
(NSCA)
Various specialties: strength coaches, sport
coaches, sport scientists, researchers, educators,
sport medicine professionals, allied health
professionals, students, business owners, exercise
instructors
Journals
Strength and Conditioning Journal
Journal of Strength and Conditioning Research
NSCA Bulletin
NSCA’s Performance Training Journal
- 38. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
NSCA’s certifications
Certified Strength and Conditioning Specialist
(CSCS)
NSCA-Certified Personal Trainer (NSCA-CC)
- 39. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
American Society for Exercise Physiology (ASEP)
Founded 1997
Journals
Journal of Exercise Physiology-online
The Professionalization of Exercise Physiology-online
ASEP Newsletter
One certification
Exercise Physiologist Certified (EPC)
- 40. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
American Alliance of Health, Physical Education,
Recreation and Dance (AAHPER)
Founded 1885
Six associations:
National Association for Sport and Physical Education (NASPE)
American Association for Health Education (AAHE)
National Dance Association (NDA)
American Association for Physical Activity and Recreation
(AAPAR)
National Association for Girls and Women in Sports (NAGWS)
Research Consortium (RC)
- 41. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
American Association of Cardiovascular and
Pulmonary Rehabilitation (AACVPR)
Cardiopulmonary rehab, clinical exercise
physiology
No certifications, AACVPR works closely with
ACSM guidelines and certifications
Journal
Journal of Cardiopulmonary Rehabilitation
- 42. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
American Physiological Society (APS)
Founded 1887
Journals
16 different journals
Journal of Applied Physiology
American Journal of Physiology
- 43. © 2010 McGraw-Hill Higher Education. All rights reserved.
Professional Organizations
and Certifications
North American Society for Pediatric Exercise
Medicine (NASPEM)
Physicians and allied health professionals who
apply testing & therapy in children with
cardiopulmonary disorders
Focus on acute responses and chronic adaptations
with diseases and disorders
No Certification
Journal
Pediatric Exercise Science
- 44. © 2010 McGraw-Hill Higher Education. All rights reserved.
Fitness Related Organizations
and Certifications
American Council on Exercise (ACE)
Certifications
ACE Personal Trainer
ACE Group Fitness Instructor
Lifestyle and Weight Management Consultant
Advanced Health and Fitness Specialist
- 45. © 2010 McGraw-Hill Higher Education. All rights reserved.
Fitness Related Organizations
and Certifications
Aerobics and Fitness Association of America
(AFAA)
Certifications
Several certifications
Personal Trainer Certification
Primary Group Exercise Certification
- 46. © 2010 McGraw-Hill Higher Education. All rights reserved.
Careers in Exercise
Physiology
Many career options for different levels of study (select examples):
Personal trainer Bachelors
Fitness instructor Bachelors, Masters
Sports consultant Bachelors, Masters, Doctorate
Exercise physiologist Masters, Doctorate
Clinical exercise physiologist Bachelors, Masters, Doctorate
Exercise technologist
or stress testing technician
Bachelors, Masters
Exercise specialist Bachelors, Masters
Wellness counselor Bachelors, Masters
Professor Doctorate
Physical therapist/Occupational therapist Bachelors, Masters, Doctorate in Physical or Occupational
Therapy
Medical doctor Bachelors & Medical School
Chiropractor Chiropractic School
Nursing Bachelors plus degree in nursing