THE PHYSIOLOGY OF FITNESS The body’s response to acute exercise Part Three: Musculoskeletal...
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Transcript of THE PHYSIOLOGY OF FITNESS The body’s response to acute exercise Part Three: Musculoskeletal...
THE PHYSIOLOGY OF FITNESS
The body’s response to acute exercise
Part Three: Musculoskeletal Response
Session Outcomes
List two responses of the musculoskeletal system to acute exercise
Describe the processes involved in one response of the musculoskeletal system
Explain why the process occurs and the benefits it generates for exercise
Recap :Responses to physical activity Can be acute or
chronic Acute – body’s
immediate responses to exercise
Chronic – adaptations to the body that occur through regular training
Responses to physical activity Musculoskeletal
responses:1. Increased
blood supply2. Increased
muscle pliability
3. Increased range of movement
4. Muscle fibre tears
Musculoskeletal system
Consists of muscles, tendons, ligaments, bones and cartilage.
Their function is to support and move the body (posture)
The system is controlled by the nervous system to produce voluntary movement.
Nerve impulses cause muscles to contact
LINK http://www.youtube.com/watch?v=7Rzi7zYlWno
Musculoskeletal system
Muscle tissue has four main properties: Excitability (ability to respond to
stimuli) Contractibility (ability to contract) Extensibility (ability of a muscle to be
stretched without tearing) Elasticity (ability to return to its normal
shape).
Individual task
What acute responses have occurred in your musculoskeletal system?
Identify responses and try to explain why you believe these responses have occurred.
1. Increased blood supply
Increase in temperature and metabolic activity.
Muscle contraction produces heat and as much as 70% of body heat is produced by energy production in muscle tissue (Shivering !!)
The greater demand for oxygen is met by an increase in blood supply through capillary dilation
2. Increase in muscle pliability
KEY TERM:
Pliability – relates to the stretchiness of your muscles and connective tissue.
Question: Muscle damage – increase
or decreased risk when warm?
Warming of muscles makes them more pliable and reduces the risk of injury and damage – natural response
3. Increased range of movement
KEY TERM:
Viscous: the measure of resistance (thickness) of a fluid.
Acute responses to the skeletal system is demonstrated by changes within the joints
Joint movement stimulates the secretion of synovial fluid
The fluid becomes less viscous and the R.O.M. at the joint increases
4. Muscle fibre micro tears
The stress placed on your muscles during exercise leads to tiny tears in the muscle fibres
The tears will cause swelling in the muscle tissue, this creates pressure on the nerve endings and pain
Training improvements will only be made if the body has sufficient fuel and rest to repair the micro tears.
Repair of the tears will make the muscle a little bit stronger than it was before
Session Outcomes
List two responses of the musculoskeletal system to acute exercise
Describe the processes involved in one response of the musculoskeletal system
Explain why the process occurs and the benefits it generates for exercise
TASK
In pairs you are to produce a poster presentation of an elite athlete showing acute responses to their activity? Cardiovascular responses Respiratory responses Musculoskeletal responses Energy systems used
Practical
Practical Task in groups of 4
You are to plan exercise in the sports hall for each main energy system. Cp energy system -10s
‘explosive’ 1 min rest intervals Lactic acid energy system 60-90s
‘high intensity’ 3min rest Aerobic energy system 2min+
Plan how you can record acute responses to these activities