Lectures 17-20 Flashcards
What are necessary stimuli for adaptations to occur to resistance training?
(Hormones)
Mechanical and hormonal responses
Resistance training stimulates “X” in blood hormone concentrations
(Hormones)
Acute changes
Hormones have what properties that are important for adaptation?
(Hormones)
Anabolic and Catabolic
What plays an important role in mediating long term adaptation?
(Hormones)
Design of individual workout, load/volume/rest etc
What do hormones do?
Hormones
Tranduce signals from endocrine organs to the muscle which elicit mechanics and enable hypertrophy
Definition of endocrine glands
Hormones
Body structures specialised for releasing hormones into the blood
Definition of hormones
Hormones
Chemical messengers that are synthesised, stored, and released into the blood by endocrine glands and certain other cells
Name some examples of anabolic hormones
Hormones
Insulin
Insulin-like growth factors (IGF)
Testosterone
Growth hormone
Anabolic hormones promote what?
Hormones
Prompt protein synthesis
Tissue building
Name an example of a catabolic hormone
Hormones
Cortisol
Do catabolic hormones have the opposite effect to anabolic hormones?
(Hormones)
Yes
What is released in the Pineal gland?
Hormones
Melatonin
What is released in the pituitary gland and hypothalamus?
Hormones
Growth hormone
What is released in the thyroid and parathyroid glands?
Hormones
Thyroid hormone
What is released in the Liver?
Hormones
IGF
What is released in the pancreas
Hormones
Insulin
What is released in the adrenal glands?
Hormones
Cortisol & Catecholamine’s
What is released in the testicles
Hormones
Testosterone
What is released in the ovaries?
Hormones
Oestrogen
What are Catecholamine’s
Hormones
Things like adrenaline
Are hormones involved with protein synthesis and degradation mechanisms that are part of muscle adaptation to resistance exercise?
(Hormones)
Yes
This includes both anabolic and catabolic hormones
Name a theory for hormonal action
Hormones
Lock and Key theory
How are hormones typically carried in the blood? And why?
Hormones
Bound to a transport protein
Stops them getting broken down too quickly in the blood
Can the natural level of testosterone in the body be increased by resistance training?
(Hormones)
Yes
What are the three primary anabolic hormones involved in muscle tissue growth and remodelling?
(Hormones)
Testosterone
Growth Hormone (GH)
Insulin-like growth factors (IGFs)
True/False
Anabolic steroids are just a derivative of testosterone
(Hormones)
True
In humans, where is testosterone produced?
Hormones
In the Leydig cells in the testes and adrenal cortex
Where is the only place testosterone is produced in females?
Hormones
Adrenal cortex
Name the two different properties testosterone & anabolic steroids have
(Hormones)
Androgenic properties
Anabolic properties
What are andogrenic properties of testosterone & anabolic steroids
(Hormones)
Development of Male characteristics eg deep voice and male hair growth
What are anabolic properties of testosterone & anabolic steroids
(Hormones)
Impacts protein metabolism by simulation of protein synthesis and inhibition of protein breakdown
In men what % of testosterone is produced in the testes
And
What % is produced in the adrenal cortex
(Hormones)
90-95%
5-10%
What is the ratio of testosterone to epitestosterone?
Why is this useful?
(Hormones)
1:1
Can help detect if an athlete is using steroids
True/False
Males have a greater adaptational response to testosterone than females
(Hormones)
True
What are the physiological functions of testosterone?
Hormones
Protein synthesis
Increased strength and size of skeletal muscle
Increased force production potential and muscle mass
May enhance nervous system development in long-term training, such as neural adaptations that occur for strength gain in highly trained strength/power athletes
5alpha-reductase converts testosterone into what?
Hormones
DHT
What is DHT?
Hormones
Basically a stronger version of testosterone
Aroma fade converts testosterone into what? And where?
Hormones
Oestradiol in adipose tissue
The actions of 5alpha-reductase and Aromatase are important for what?
(Hormones)
Determining the effects of androgens
A greater metabolic stress on the body
Hormones
Which illicits greater hypertrophy mechanisms
How do you maximise increases in testosterone concentration?
Hormones
Use large muscle group exercises
Use heavy resistance (75-95% of 1RM)
Use moderate to high volume of exercise, with multiple sets (3 or greater) and exercises
Use short rest intervals (1min better than 3min)
Adverse risks of anabolic steroids
Hormones
Increased sex drive
Occurrence of acne
Increased body hair
Increase of aggressive behaviour
Elevated blood pressure (long list slide 15, lecture 17)
Addiction
Can muscle breakdown be beneficial for building strength?
Hormones
Yes, because the muscle can be rebuilt better
Process of steroid action on cell, Slide 16
Hormones
Lecture 17
What is downregulation (check)
Hormones
The inability of a hormone to interact with a receptor
Can an increase in the number of receptors be as useful an adaptation as increased release of a hormone
(Hormones)
Yes, sometimes even more significant
True/False
A large change in number of receptors can mediate large effects
(Hormones)
True
Adaptations to endocrine system following resistance training (X7)
Likely exam question
(Hormones)
Amount of synthesis and storage of hormones
Transport hormones via binding proteins
Increases in hormonal concentration in blood
Time needed for the clearance of hormones through liver and other tissues
Amount of hormonal degradation that takes place over a given period of time
How much blood-to-tissue fluid shift occurs with exercise stress
Number of receptors in muscle tissue
How does growth hormone act?
Hormones
Interacts directly with target tissues, which include: bone, immune cells, skeletal muscle, fat cells, and liver tissue
What is growth hormone regulated by? And mediated by?
Hormones
Neuroendocrine feedback mechanisms and mediated by secondary hormones
What are the modulating factors for release of growth hormone by the brain
(Hormones)
Stress Fitness Diet Age Gender Adiposity Exercise Injury
What happens if too little growth hormone?
Hormones
Underdeveloped
Dwarfism
What happens if too much growth hormone?
Hormones
Overdeveloped (gigantism)
Physiological functions of growth hormone
Hormones
Decreased glucose utilisation Decreased glycogen synthesis Increases AA transport across cell membranes Increased protein synthesis Increased lipolysis (fat breakdown) Stimulated cartilage growth
How does Growth Hormone respond to stresses (like resistance exercise)?
(Hormones)
GH increases in response to higher volume and intensity training and lower rest periods
What are the exercise responses of insulin-like growth factors?
(Hormones)
Stimulates liver to synthesise and secrete IGF-I
Exercise results in acute increases in blood levels of IGF-I
Cortisol (glucocorticoids) are releases from where? In response to what?
(Hormones)
Adrenal cortex
In response to the stress of exercise
What are some of the main actions of cortisol?
Hormones
Convert AA -> carbohydrates
Increase levels of enzymes that break down proteins
Inhibits protein synthesis
The anti-anabolic properties of cortisol are linked to what?
Hormones
The attenuation of anabolic hormones
The catabolic effects of cortisol have a greater effect on what kind of muscle?
(Hormones)
Type II