Week 6 Cv And Flexabilty Training Flashcards
(52 cards)
Cardiorespiratory ‘aerobic’ training
Assess cardiorespiratory fitness status
– Single-stageTreadmillJoggingTest
– Astrand-Rhyming Cycle Ergometer Test
Devise an aerobic exercise programme that..
– Meets the individuals needs and interests
– Takes into account their age, gender, fitness level & exercise habits
Does your client have a health or fitness goal?
– The quantity of exercise needed to promote health is less than that needed to develop and maintain higher levels of fitness
– Adjust exercise prescription according to your clients primary goal
Your estimated VO2max can be expressed in two ways:
1. Absolute VO2max
(L/min)
2. Relative VO2max
(ml/kg/min)
Goals of CV exercise training
Improve health & ↓ disease risk
– Can be achieved with moderate intensity activity done 30 min.d, 5 d.wk-1
Improve fitness
– Can only be achieved with vigorous intensity activity
• CV demands must reach an intensity sufficient to ↑ (overload) stroke volume and cardiac output
• CV overload must activate specific muscle groups to enhance local circulation and the muscle’s metabolic machinery
Elements of CV exercise session
Warm – Up (5 – 10 min)
– ↑ blood flow to working cardiac and skeletal muscles, ↑ body temp, ↓ the risk of muscle & joint injury, and abnormal cardiac rhythms. Performed at low intensity.
Endurance conditioning (20 – 60 min)
– Follow the FITT principle
Cool-down (5 – 10 min)
– ↓ the risk of CV complications caused by stopping exercise suddenly. Performing low intensity exercise allows HR and BP to return to baseline. Muscle pump prevents venous pooling and ↓ risk of dizziness and fainting
Why cool down ?
Performing active cool-downs
i) promote faster
recovery of the cardiovascular and respiratory systems
ii) accelerate recovery of blood
lactate
iii) may partially
prevent immune system depression
HR and VO2 response to aerobic exercise
Hr and exercise Intensity are both linear
VO2 and exercise intensity are both linear
Range of training intently 70-80% of Hr max
Blood flow response to exercise
Blood flow is redirected, away from areas it is not needed via smooth muscle vasoconstriction (SNS mediated), and increased to exercising muscle via local vasodilation (metabolic and endothelial mediated) mechanisms
Sympathetic nervous system,
Vasoconstriction
Acute BP response to aerobic exercise
A linear ↑ in systolic blood pressure (SBP) with increasing levels of exertion, while diastolic blood pressure (DBP) may decrease due to vasodilation
CV & pulmonary adaptations
Increased
+ Blood volume & total hemoglobin
+ Heart size and volume (cardiac hypertrophy)
+ Stroke Volume (at rest & during exercise)
+ Cardiac output (maximum)
+ Blood vessel size & improved endothelial function
+ Lung volume
+ Oxygen extraction from blood (↑ aVO2 diff)
+ VO2max
Decreased:
- Resting & submaximal HR
- Blood pressure
Musculoskeletal adaptations
Increased
+ Capillarisation
+ Mitochondrial content & function
+ Aerobic enzyme (such as citrate synthase) activity
+ Myoglobin stores
+ Glycogen & triglyceride storage
= ↑ capacity to generate ATP aerobically
+ Bone density & mass
+ Strength of connective tissue
Blood lactate concentration
Additional adaptations
Increased
+ Fat oxidation
+ Heat acclimation
+ High-density lipoprotein cholesterol
+ Glucose tolerance
+ Mood
Decreased
- Body mass & body fat
- Total cholesterol
- Low-density lipoprotein cholesterol
- Risk of developing atherosclerosis
- Insulin resistance
- Depression
Factors that affect aerobic training responses
Five important factors influence the aerobic training response:
1. Initial level of aerobic fitness
2. Trainingintensity
3. Trainingfrequency
4. Trainingduration
5. Genetics
Take home points so far….
- When we exercise aerobically, oxygen consumption increases linearly with changes in cardiac output (which is redistributed to the active skeletal muscle) and SBP increases with exercise intensity
- Endurance exercise stimulates cardiorespiratory, musculoskeletal and metabolic adaptations which improve health and aerobic fitness
Intensity of Exercise
Exercise intensity is a key factor in determining physiological adaptations to the exercise stimulus
Consider
– Client’s aerobic fitness status – Goals for the programme
– Exercise preferences
– Injury risks
Intensity and Duration are indirectly related
Exercise Intensity Domains
Prescribing exercise intensity
Aerobic exercise intensity can be expressed in a number of ways
- Energy expended per unit of time (e.g. 9 kcal.min-1)
- Absolute exercise level or PO (e.g. cycle at 150 W)
- Relative metabolic level %VO2max, or %VO2R (e.g. 85% VO2max or 75% VO2R)
- Exercise HR, %HRmax or %HHR (e.g. 180 b.min-1 , 80% HRmax or 75% HHR)
- Multiples of resting metabolic rate (e.g. 6 METs)
- Rating of perceived exertion (e.g. 14) RPE =
7.talk test (eg inability to have a conversation, intensity > anaerobic threshold)
Note: Heart rate reserve (HHR) = HRmax – Hrrest VO2 reserve (VO2R) = VO2max – VO2rest
Estimating intensity of aerobic exercise
Interaction of fitness and training intensity
What intensity is recommended?
Aerobic training has been demonstrated to be beneficial when performed at an intensity of 60 – 90% of maximum heart rate (HRmax) or 40 - 85% of HR reserve (HRR)
…But it does vary depending on clients’ initial fitness classification
Fat burning zone
Duration of exercise
30 – 60 min per day (≥ 150 min/wk) of moderate intensity exercise
• 20 – 60 min per day (≥ 75 min/wk) or vigorous intensity exercise
• Or a combination of moderate and vigorous intensity per day to attain the volumes of exercise recommended
• <20 min per day can be beneficial in sedentary individuals
• ≥60 – 90 min per day needed for weight management
Frequency of exercise
The frequency of exercise sessions depends on your clients caloric goals, health & fitness level, preference and time constraints
For health benefits individuals should exercise at moderate intensity for at least 5 days per week
– 5 times per week at light to moderate intensities for individuals with poor aerobic fitness levels
– 3 times per week at a moderate to vigorous intensity for individuals with good aerobic fitness
Exercising on alternate days can aid recovery and ↓ the risk of injury
Volume of exercise
Product of Frequency, Intensity and Time
• For health: A target volume of ≥ 500 – 1000 MET-min.wk-1 = approximately 1,000 kcal.wk-1 of moderate intensity (3-6 METs) exercise (for about 150 min.wk-1)
• For weight loss: Each activity session should last at least 60 min at sufficient intensity to expend 300 kcal or more
• Determine weekly caloric expenditure goal / target caloric threshold
Types (Modes) of Aerobic Exercise
Gym based
• Treadmills
• Upright, recumbent and spinning bikes
• Rowers
• Steppers and vertical climbers
• Elliptical trainers
Consider
– Exercise intensity / Level of fitness required – Level of skill required
– Rate of energy expenditure required
– Ease of grading & adjusting intensity