Unit 4 - Principles of Fitness, Exercise and Health Flashcards
Level 2 Fitness Instructor, Unit 4, study toward written exam.
Is “Fitness” described by everyone the same way?
No, as a concept it is difficult to provide a definitive definition, because fitness means different things to different people: A state of well-being, e performs physical activity, adaptation to the stresses of one’s lifestyle, ability to carry out everyday tasks with vigor and without excess stress or fatigue.
What are the five main components of total fitness?
• physical fitness (health-related and skill-related) • mental and emotional fitness – harmony with a positive mental state • medical fitness – free from injury, disease and illness • nutritional fitness – good nutritional intake for fuel, growth and repair • social – healthy interaction with others
For an instructor, which components of fitness are predominant?
For an instructor the components of physical fitness will be the focus.
Which are the five components of health- related fitness?
Cardiovascular fitness Muscular strength Muscular endurance Flexibility Body composition
Define cardiovascular fitness.
Cardiovascular fitness is the ability of the heart, lungs and muscles to take in, transport and utilize oxygen during exercise. By doing physical activity the pulse quickens and breathing gets deeper – you are using the cardiovascular system. The cardiovascular system’s efficiency will be improved through regular aerobic training.
Define Muscular strength.
Muscular strength can be defined as the maximal amount of force a muscle or group of muscles can generate during one contraction.
Why is the development of muscular strength useful?
For 2 key reasons. Firstly, the individual is able to produce a greater maximal force when required to do so. Secondly, with enhanced levels of strength everyday sub-maximal tasks require a lesser percentage of the individual’s maximal effort, thus making the task easier.
Give examples for activities requiring maximal strength.
Heavy weight lifting and lifting or moving heavy objects.
Define muscular endurance.
Muscular endurance can be defined as the ability of a muscle or group of muscles to contract repeatedly for extended periods of time without fatigue. The vast majority of everyday situations that require an individual to exert force require muscular endurance.
Which common activities require muscular endurance?
Carrying shopping, walking up stairs, maintaining a good posture, gardening and exercise sessions involving high repetition resistance training.
How can Flexibility be defined?
Flexibility can be defined as the range of movement about a joint or series of joints.
Why is it important to the individual to develop and maintain flexibility?
To ensure an appropriate range of motion at all joints and a freedom of movement.
Give examples of activities and sports that require flexibility.
gymnastics, dance, yoga and everyday normal function.
What does body composition describe in health-related fitness?
It’s used to describe the percentages of fat, bone and muscle in human bodies.
Why is the percentage of fat of most interest?
Because it can be very helpful in judging health in addition to body weight.
What amount of body fat does the National Institute of Health recommend that an adult’s male body should have?
Between 13 and 17 percent fat.
What amount of body fat does the National Institute of Health recommend that an adult’s female body should have?
Between 20 and 25 percent fat.
At what body fat percentage do most athletes experience greater performance benefits?
Between 7 and 19 percent for men, and 10 and 25 percent for women, depending on the sport.
Which are the 6 skill-related fitness components?
Speed Power Reaction time Co-ordination Balance Agility
Explain the skill-related component of Speed.
Speed is about quickness of movement, whether this is the legs of a runner or the arms of the shot putter. Speed is an integral part of every sport and can be expressed as any one of, or combination of, the following: maximum speed, elastic strength (power) and speed endurance.
Explain the skill-related component of Power.
Power is the ability to exert maximum muscular contraction instantly in an explosive burst of movements. The two components of power are strength and speed e.g. jumping or a sprint start.
Explain the skill-related component of Reaction time.
Reaction time is the ability to respond quickly to a stimulus. Simple reaction time is the time taken between a stimulus and movement e.g. sprint start. Such simple reaction time depends on nerve connections and signal pathways, is ‘hard wired’ in the body and cannot be improved. Another type of reaction time, choice reaction time, is the time taken between stimulus and action which requires a choice. Choice reaction time can be improved by practice and training.
Explain the skill-related component of Co-ordination.
The ability to move two or more body parts under control, smoothly and efficiently.
Explain the skill-related component of Balance.
The ability to control the body’s position, either stationary e.g. a handstand or while moving e.g. a gymnastics move.
Explain the skill-related component of Agility.
The ability to perform a series of explosive power movements in rapid succession in opposing directions e.g. zigzag running or cutting movements.
Which factor will affect an individual’s fitness level?
Age
Gender
Physique/body type
Diet
Activity Level
Physical disabilities
Illness and fatigue
Drugs
Stress
Environment
How can age affect the fitness level?
Fitness is generally greatest during the 20’s. Although the speed at which the effects of ageing occur can be offset by regular physical activity, it progressively results in weaker muscles, lighter bones, stiffer joints, slower reflexes and an increase in body fat.
How can gender affect the fitness level?
Up to puberty males and females tend to be equal in terms of general fitness. However, due to increased levels of testosterone, active males grow stronger due to greater muscle mass. Since males are generally larger than females they have larger lungs and therefore have a greater potential for transporting oxygen thereby increasing CV fitness abilities. With longer bones and larger muscles males have the ability to move faster. Females of all ages tend to be more flexible than males. Females usually have more body fat than males.
How does Physique/Body Type affect the fitness level?
An individual’s body type will have a significant impact on their ability to perform various physical tasks successfully e.g. a tall thin person may be more suited to basketball than rugby.
What is a simply system for assessing body type?
The visual system of somatotyping. It suggests that there are three distinct body types: ectomorphs, endomorphs and mesomorphs.
How are ectomorphs?
Ectomorphs are naturally thin with little body fat or muscle mass. Ectomorphs find it difficult to gain weight (either muscle or fat) and are well suited to weight-bearing aerobic activities such as long distance running.
How are Mesomorphs?
Mesomorphs tend to be naturally lean and muscular, with broad shoulders and narrow waist and hips. Mesomorphs are naturally athletic and tend to be suited to a wide variety of sporting activities, especially those requiring a good power to weight ratio.
How are Endomorphs?
Endomorphs are naturally predisposed to fat storage. They tend to be apple or pear-shaped and carry large amounts of body fat. Endomorphs also tend to possess a
reasonable degree of muscle mass, although this is often overlooked due to the predisposition for fat storage. Activities such as shot putt and hammer throwing may
be suited to endomorphs.
Can any individual clearly be categorized within the three different body types?
No, many individuals are not exclusively one of the body types, but rather a combination of two or more. For example, an individual with a small frame, little muscle mass and a tendency to store body fat could be considered an ectomorph with endomorphic
tendencies.
Why is understanding the body type important when discussing and cementing clients objectives?
An endomorph with a goal of becoming a competitive marathon runner may need to re-evaluate their objective as they are not structurally suited to this type of activity. Similarly, ectomorphs are unlikely to succeed in the field of competitive bodybuilding as they have difficulty gaining muscular size. If this is to be discussed, then it will obviously need to be done with sensitivity.
How can diet affect the fitness level?
The body needs certain substances for energy, growth and repair which are provided by the food taken in. A healthy diet with quality nutrition will help ensure that the
body will function at its best.
How can the activity level affect the fitness level?
Running and training with weights are not the only way to help with your fitness levels. Regular activities such as walking the dog, cycling and gardening, can also
make significant contributions.
How can physical disabilities affect the fitness level?
Although a physical impairment may prevent part of the body functioning correctly, targeted exercise can keep the rest of the body very fit. As demonstrated in the Paralympics, many disabled people are first class athletes.
How can illness and fatique affect the fitness level?
When tired or ill the ability to perform diminishes. This could be caused through working too hard with insufficient rest.
How can drugs affect the fitness level?
Both medical and recreational drugs (alcohol, cigarettes) will affect an individual’s fitness. When undertaking physical activity, recreational drugs should be avoided
and, if taking drugs for health reasons, medical advice should be sought.
How can stress affect the fitness level?
High levels of stress can lead to illness, causing health problems such as high blood pressure and heart disease.
How can the environment affect the fitness level?
The quality of the air taken in will determine the amount of oxygen that can be utilised. Aerobic fitness can therefore be significantly influenced by the following
environmental factors:
• fumes from traffic and factories
• weather – hot, cold, humidity
• at high altitude the air is thinner and individuals will need to breathe harder to get enough oxygen in
What are the main cause of death in the UK and many
developed nations?
Diseases of inactivity (hypokinetic).
What do current guidelines suggests to be active?
• significant health benefits can be gained by including 30 minutes of moderate activity on most, if not all, days of the week (Department of Health, 2004)
• additional health benefits can be gained through regular participation in activity that is of longer duration or of more vigorous intensity (U.S. Department
of Health and Human Services, 1996)
What are the benefits of physical activity? What can it help to prevent?
Overall mortality
Cardiovascular diseases
Cancer
Osteoarthritis
Osteoporosis
Falling
Obesity
Type II diabetes
Mental health
Health-related quality of life
What does exercise do the body? (Stimulation)
Exercise is a stimulus which primarily affects the cardiovascular and neuromuscular systems and so it is within these that most adaptations are experienced.
What are cardiovascular and respiratory adaptations to endurance / aerobic training?
Heart:
- increased size of the heart muscle (ventricular hypertrophy)
- increased strength of contraction
- increased stroke volume
- increased cardiac output
- reduced resting heart rate
- increased blood vessel size
- decreased risk of heart disease
Blood vessels and blood chemistry:
- reduced systolic and diastolic blood pressure (SBP and DBP)
- favourable change in blood lipids
- increased haemoglobin
- increased blood volume
Lungs:
- increased functional capacity during exercise
- increased diffusion of respiratory gases
- increased vital capacity
Metabolic function:
- decreased insulin resistance and improved glucose tolerance - beneficial for treatment and prevention of diabetes
- reduced body fat
- increased maximal O2 uptake (V02 max)
Muscular changes:
- increased capillarisation of muscles
- increased enzymatic function within muscle cells
- increase in size and number of mitochondria
- improved perception of muscle tone
Psychological factors:
- improved self mastery
- increased social interaction
- distraction from the daily routine
- decreased depression and anxiety
What short term effects does aerobic exercise have on blood pressure?
There is a linear increase in SBP with increasing levels of exertion.
In contrast, during exertion DBP may decrease slightly, due to vasodilation, or will remain unchanged, except in hypertensives where it may rise as a result of an impaired vasodilatory response.
How do heavy weight training and isometric exercise affect blood pressure?
heavy weight training and isometric exercise will significantly increase both systolic and diastolic blood pressure.
What long-term effects does aerobic exercise have on blood pressure?
Aerobic exercise using large muscle groups in rhythmical activity is very appropriate for reducing blood pressure over time. With the exception of circuit weight training, chronic strength or resistance training has not consistently been shown to lower resting blood pressure
What is Blood pooling?
- During exercise, as the heart rate rises, there is an increased flow of blood to muscles but nevertheless, venous return is maintained mainly due to the increased pumping action of the muscles.
- Should the activity stop suddenly however, the heart will still continue pumping blood around the body at the exercising rate for some time.
- Since the muscles now will have stopped working, extra blood will begin to build up or ‘pool’ in large muscle groups. This effect is called ‘blood pooling.’
Which part of the body is mostly affected by blood pooling?
- The legs are most commonly affected due to the extra influence of gravity.
- Common symptoms are nausea, dizziness and fainting.
What short-term (while the individual is exercising) effects does exercise have on bones and joints?
Short term responses (to any movements/exercise):
- increase in synovial fluid production
What is an increase of synovial fluid production?
In response to increased movement, synovial joints will increase the production of synovial fluid. This fluid acts as a lubricant to protect the joint from excess wear and
tear (much like the oil in a car engine).
What are long term adaptations (to weight-bearing exercise)?
- stronger ligaments
- increased bone density
- reduced loss of bone mass associated with age
What is delayed onset of muscular soreness (DOMS)?
This is the name given to the pain, soreness or stiffness experienced in muscles typically between 12-72 hours after exercise
When is DOMS especially common?
It is particularly common following the beginning of a new exercise programme, especially if it involves increased eccentric loading (e.g. going down stairs, running downhill, downward motion of squats) or an increase in intensity. This seems to be caused by exercise-induced muscle damage followed by an inflammatory response, although the exact mechanisms are still not fully understood.
What are the short term effects of exercise on muscles?
- Vasodilation (diversion of blood) to the working muscles, and away from the non-essential organs. This can result in a temporary increase in muscle diameter, sometimes called the ‘pump’
- Possible DOMS
What are the long term effects of exercise on muscles?
- repetition of any activity will enhance neuromuscular connections, helping improve motor fitness by enabling greater efficiency of movement and motor unit recruitment
- dependent on the regularity, duration and intensity with which a muscle is used, the properties of a muscle are also changed
What effect does aerobic exercise and muscular endurance resistance training have on muscles (fibres)?
Low intensity, long duration exercise can bring about the following changes on Type I fibres:
• an increase in the number and size of mitochondria in the muscle fibres
• an increase in the number of capillaries surrounding these fibres
• an increase in the number of aerobic enzymes stored glycogen and triglycerides in the muscle fibres
What effect does Hypertrophy and strength resistance training have on muscles (fibres)?
Short duration, high-intensity exercise affects mainly Type II fibres:
• a decrease in nervous inhibition
• an increase in the diameter of the recruited fibres (hypertrophy) due to an increase in the myofilaments within the fibres
• an increase in the glycolytic activity of the muscle allowing more work to be performed under anaerobic conditions or high-stress conditions
What does the modern lifestyle do to our posture?
- Modern lifestyles involve sitting for much longer periods of time e.g. sitting, driving, which encourages a round-shouldered ‘kyphotic’ posture.
- Also, work tends to involve small movements performed under tension (use of a computer keyboard, for example) resulting in shortened muscles and poor flexibility.
- Eventually, these effects will lead to decreased function and increase the risk of injury, pain and discomfort.
What should the instructor endeavour to improve good posture?
The instructor should, therefore, endeavour to include resistance exercises, and stretches in their training programmes which help compensate for modern lifestyle factors, such as rounded-shoulders and poor range of movement, etc.
What exercises can be included when initiating a posture-improvement process?
- full range
- compound movement patterns
- a free-standing posture
- free weights and cables
- an equal number of push and pull exercises
- dynamic and developmental stretches
Name the morphological factors of the benefits of resistance training.
- muscle hypertrophy due to increases in contractile proteins, number and size of myofibrils, connective tissues, and size of type II fibres
- increase in strength and size of ligaments and tendons
- increase in bone density and bone strength
- increase in muscle capillary density