Speed & Agility

Question 1

Speed definition

Answer 1

capacity to travel or move quickly, linear or whole body motion

Question 2

2 types of speed + definition

Answer 2

• *1) general speed**
• performing any kind of linear movement quickly
• foundation for specific speed
• *2) specific speed**
• performing a unique task or skill quickly
• specific to a sport
• non-transferable, tennis to track for example

Question 3

Factors affecting speed

Answer 3

1) Heredity: metabolic profile, muscle fibre type, nervous system + motor unit activation
2) reaction time
3) Technique (mechanics of movemet)
4) Psychological focus

Question 4

Speed vs velocity

Answer 4

Speed

• Time rate of change of distance, scalar
• Speed = D/T

Velocity

• Time rate of change of displacement, vector
• V = (position final - position initial) / (time f - time i)

Question 5

Linear kinematics

Answer 5

Position: physical location of object with respect to point of reference, unit in meters

Displacement: change in position (assumed to be rectilinear), vector quantity (magnitude + direction), unit in meters

Distance: total length of path of moving object, scalar (magnitude only)

Accel: time rate of change of velocity, vector, unit in m/s^2

Jerk: time rate of change of accel, vector, units in m/s^3

Question 6

What is a stride + rate & length?

Answer 6

Stride
- Heel contact to heel contact of same leg
- running speed = stide rate x stride length
Stride rate
- Number of strides per second
Stride length
- Linear distance per stride

Question 7

What is reaction time?

Answer 7

period of time (second or milliseconds) elapsed between stimulus and a conscious motor response

Question 8

What is agility?

Answer 8

• ability to changed direction rapidly and accurately

- “Whole body change of direction as well as rapid movement and direction change of limbs”

Question 9

What is quickness?

Answer 9

• “Multiplanar or multi-directional skill that combines accel, explosiveness, and reactiveness
• considered component of agility

Question 10

What is cutting?

Answer 10

specific portion of directional change where athletes foot contacts the ground to initiate change of direction

Question 11

Agility can broken down into 2 main components

Answer 11

1) Perceptual and decision-making factors: experience with activity, neurmuscular learning potential?
2) Change of direction speed

Question 12

Study by Jones et al

Answer 12

• investigation into physical determinants of change of direction speed
  
  • does linear sprinting speed influence agility?
• *CODS**
• change of direction speed
• ability to decelerate, reverse, change movement direction and accelerate again
• *Method**
• used flying 5 m, 25 m sprint
• and 505 agility test

Correlation + Predictability

• CODS & strength have moderate correlation
• Predictability is moderate to strong
• Flying 5 m: 58%
• Eccentric knee flexor: additional 9%