Performance Analysis and Match Play demands Flashcards
Define time motion analysis
measurement of the change in an athletes position and speed
Name two purposes of carrying out time motion analysis
quantifying work rate in field based sports
quantifying demands of different sports or different positions in a sport
Explain why it is important to consider speed of movement as well as impacts during a game, rather than just distance covered
Demands of different sports and different positions are different
rugby forwards less distance, but more impacts
tennis players, low distance but almost always sprinting
Outline the limitations of using computer based tracking to carry out time motion analysis work
requires a subjective measure of how fast the player is moving
prone to human error e.g losing track of player
need familiarisation and practice to be good at
State four variables that can be measured with GPS analysis
Total distance
distance per minute
number of sprints and length of sprints
heart rate
Explain how GPS data can be used to aid injury prevention
can see evidence of player fatigue
can see who has worked the hardest and therefore who needs more recovery time
see who did most sprints or impacts and offer recovery aids e.g compression garments
Name two other uses of GPS data
Nutritionist can use to plan meals and recovery shakes etc based on the intensity of the session
can give feedback on players performance
Explain how GPS data can be used to plan a training session of a specific intensity
From GPS data you can determine the intensity of small sided games on different sized pitches
smaller pitch = higher intensity because more sprints
GPS data has shown which pitch sizes are best for recovery and which are best for high intensity
What three factors determine the accuracy of GPS
Number of satellites in range (at least 3)
location and weather conditions
Hz/sampling speed
Discuss the limitations of using straight line testing of GPS systems
Sports teams do not move only in straight lines
don’t know if the monitors will pick up fine movements and changes of direction
Explain why the use of varied direction protocols is better than straight line protocols for testing the reliability of GPS monitors
More game specific
can tell if the monitor will pick up finer movements
See if full distance of a curve is picked up
Explain why using absoloute speed zones makes comparisons between papers difficult
No set threshold speeds, even when looking at the same sport
No reasoning behind the speeds used
Explain why the use of absoloute speed zones disadvantages some players
Some players top speed may not be high enough to get into the sprinting zone
so data will show no sprints even if they’re working really hard
Explain why it is important to have data on the high intensity work carried out in a football match
generally the most important actions of a game
best measure of the physiological demands of a game
most likely to lead to muscle damage, so need to know for recovery
develop drills to improve recovery between high interval work
Define the term internal load
sum of all physiological stress that occurs as a consequence of activity
Define the term external load
The sum of all the mechanical and locomotive stress generated to perform a bout of activity
why is the use of individualised speed zones better than using absoloute speed zones
better feedback can be given to the players
allows better and more fair comparisons between players
Outline the method of determining individualised speed zones, as defined by Cahill et al 2012
zones as a percentage of a players vMax
Outline the method of determining individulaised speeds zones, described in the Abt and Lovell paper (2009)
Players taken into the lab to determine their second ventilatiory threshold
Why is the method used by Abt and Lovell good
an objective measure of the players speed zone
individualised to each player
what are the limitations of using Abt and Lovell’s method
Not everyone will have access to a lab
time consuming
Less aerobics lot fit will spend more time running at high intensity than more aerobic ally fit be negative correlation between VO2 max and time spent at high intensity
What were the findings of the Abt and Lovell paper
2nd VT speed was at 15 km/h. lower than the 19.8 km/h used by prozone for high intensity
using 2nd VT resulted in a 167% increase in distance covered at high intensity
Over 2000m using 2nd VT
800m using prozone defined speed
VT2 speed was at 90% VO2max
What is the potential impact of the findings of the Abt and Lovell paper
Using prozone underestimates high intensity work
using new method have a better idea of amount of high intensity work done
allow better planning of recovery stratergies
Explain why it is important to measure acceleration as well as total distance
acceleration is much more physically demanding
puts increased mechanical stress on the body
data can be used to tailor recovery statergies
why must acceleration data be interpreted with caution
shows most variability
Explain the concept of player load as a measurement in Rugby Union
an equation which takes into account accelerations, up, down, forwards, backwards and sideways movement and collisions
Explain the advantage of using player loads
A more reflective measure of player demand and overall performance
e.g much higher in forwards, but forwards total distance is lower so without it would look like forwards dont work as hard
