Topic 6: Measurement and evaluation of human performance Flashcards
Standard deviation
Standard deviation is used to summarize the spread of values around the mean, and that within a normal distribution approximately 68% and 95% fall within + or - 1 or 2 standard deviation points respectively.
Explain how the standard deviation is useful for comparing the means and the spread of data between two or more samples
A small standard deviation indicates that the data is clustered closely around the mean value.
Conversely, a large standard deviation indicates wider spread around the mean.
outline the meaning of coefficient variation
Coefficient variation is the ratio of the standard deviation to the mean expressed as a percentage.
Deduce the significance of the difference between two sets of data using calculated values for t and the appropriate tables
For the t-test too be applied =, ideally the data should have a normal distribution and a sample size of at least 10. The t-test can be used to compare two sets of data and measure the amount of overlap
Outline the importance of the PAR-Q
Assesses the readiness for an individual to partake in a general training program
Components of fitness:
Health related
body composition (endomorph, ectomorph, mesomoprh - percentage of the body that is fat, muscle, or bone_
cardio-respiratory fitness (aerobic capacity)
flexibility (range of movement possible at a joint)
muscular endurance (the ability for your muscles to be used for long periods of time)
strength (the ability for your muscles to exert large amounts of force)
Used in every day life, needed to survive.
Components of fitness:
Skill related
agility balance coordination power reaction time speed Specialized components, needed more during sport events.
Some components of performance-related fitness could become health-related for certain group such as the elderly suffering from hypo-kinetic diseases.
Distinguish between the concepts of health-related fitness and performance-related fitness
The components that make up health-related fitness are: muscular strength, muscular endurance, flexibility, body composition and cardiovascular endurance. The components forming performance-related fitness are: speed, power, agility, balance, reaction time, and coordination.
The concept of HRF is that each of the components are required to a certain extent for day to day activity. You would need cardiovascular endurance to make the walk up the stairs to get to work for example. The focus of HRF is to improve the overall health of an individual.
Although the components of HRF are also requires in sport, the way in which HRF and PRF differ are that the components of PRF are required for specific sports. Not all the sports need all the PRF components. Whereas a sprinters main component would be speed and not agility, a tennis player would require much more agility and less speed than the sprinter. Components of PRF, unlike HRF are not needed in day to day life, yet HRF is beneficial to all sports. In some specialized cases, PRF can be determined a HRF, like in the case of the elderly where balance and coordination may be required to lead a healthy life and contribute to the general wellbeing of the human.
Aerobic capacity
The ability to take in, deliver and use oxygen for use by the aerobic or oxidative energy system
It is most commonly characterised by an individual’s maximal oxygen uptake (VO₂max), which is the maximal rate that oxygen can be used during maximal exercise
Underpinned by the limits of the cardiovascular and ventilatory systems to extract oxygen from the atmosphere, deliver it to respiring tissues and use it
Low levels of cardiorespiratory fitness are associated with many diseased states and epidemiological research has shown an association with a shorter lifespan
Conditions where cardiovascular or ventilatory function is impaired (heart disease, chronic lung disease) fitness is reduced
Low intensities of physical activity can be tolerated before anaerobic energy systems need to be relied on
High levels of cardiorespiratory fitness are observed in endurance trained athletes
Enabling them to tolerate much higher intensities and durations of physical activity
Flexibility
The ability to move through the full range of movement around a joint
Flexibility is underpinned by a range of condition:
The capacity of the muscles and tendons to stretch
Ligament condition
Joint mechanics
Size and shapes of bones
Muscular endurance
The ability of a muscle or muscle group to maintain force or power
The underpinning physiology is a complex interaction of a number of factors and their relative importance depends on the relative intensity of muscular contractions
Mostly related to the availability of substrates, enzyme activity and build-up of metabolites
Agility
The ability to rapidly change direction or speed
This may or may not be in response to stimulus
It can be separated into the physical ability to change direction or speed
Strength
The ability to generate force by a muscle or muscle group
Strength is underpinned by the muscle mass that is available (volume and muscle fibre-type), the ability to activate that muscle mass and the coordination of this muscle activity
Dependent on both the neural and muscular systems and their successful interaction
Speed
The ability to change the distance with respect to time when movement occurs
This could refer to whole-body speed or of a particular joint or muscle group
Depending on the context in sport and exercise
In many sporting competitions the time that it takes to complete a given activity is what determine the outcome
Explosive sporting activities such as jumping and throwing rely on speed of movement
Body composition
Relates to the proportion of an individual’s total body mass that is made up of fat and fat-free mass
What makes up the total body mass is important
Body fat mass (FM) includes essential fat found in the tissues, organs and stored fat
Energy Reserve
Fat-free mass (FFM) refers to what makes up the rest of the body
Muscle, water and bone
High levels of body fat are associated with many pathological disorders and so maintenance of low body fat mass is important for health-related physical fitness
Fat mass that is too low
Anorexia
Muscle mass that is too low
Sarcopenia
Most sporting activities, body fat is kept low
Sumo wrestling being an extreme opposite
In collision sports, FFM is kept high
American football
Rugby
FFM is kept low
In weight restricted sports
Boxing
Aesthetic sports
Gymnastics
Bone density is another important aspect of body composition
A low bone density underpins osteoporosis
Exercise can play an important role in maintaining bone density
Balance
The stability of the body
To maintain balance the center of gravity needs to be maintained above the supporting base of the body and this is achieved through coordinated contraction and relaxation of postural muscles in response to positional changes
Postural changes are detected by visual, vestibular and proprioceptive processes and this stimulates the coordinated muscular responses in order to maintain balance
Successful balance depends on the ability to sense position and respond to the sensory information in a coordinated fashion, with integration of neuromuscular systems
Coordination
The ability to integrate the above listed components so that effective movements are achieved.
Reaction time
The duration between the presentation of a stimulus and the associated response
Depends on the integration of neuromuscular systems
The reaction time reflects the combination
Detecting sensory information
Processing this information
Sending a response
Effecting this response
The reaction time is very dependent on the interaction of the stimulus type and the environment
There may be single stimulus and single response in the simplest tasks, compared to highly complex tasks with multiple stimuli and multiple responses with distracting information