• July 22, 2016
• 0

This is a solution of Movement Science Assignment in which we discuss According to the video analysis, the slips catch the ball which is going above the head a fair bit so the body goes in full stretch to catch the ball.

# Slips Catch (Lower Limb)

The following analysis is of the Mitchell Forster catching a ball from the slips. This part just focuses on the lower limbs. According to the video data analysis, the slips catch the ball which is going above the head a fair bit so the body goes in full stretch to catch the ball. There is a little ankle dorsiflexion of about 0.63˚, Hip flexion of about 64.73˚ and knee flexion of 95.32˚. When the body goes in full stretch to catch the ball, the hip goes into full extension, the knee goes into full extension and the ankle goes into a plantar flexion to allow the body to jump up and catch the ball. Will full stretch the hip joint went into a little of hyperextension of 184.91˚, the knee will go to an extension of 179.42˚ and the ankle joint for 58.48˚ of plantar flexion. The ankle went in a little dorsiflexion from the anatomical position in the slips to provide a little spring effect to the push the body off and goes into plantar flexion. The knees went into full extension to heighten the body to catch the ball. The little hyperextension of the hip is to allow the upper body to counter the force the ball was exerting towards the body. When you look at the Graph 1 below, you can see that the graph shows the different timing for the different joint. The ankle goes into plantar flexion first then followed by the knee extension and then the hips goes into extension to allow the body to be vertical to catch the ball.  A slips player is closer to the ground to provide a good base of support and centre of gravity and the centre of gravity moves from the ankles up so that the player is able to maintain a stable position to catch the ball.

## Slips Catch (Upper Limb)

The upper limb is also stretched to catch the ball as the ball is coming over to the head. The analysis only considered the shoulder and elbow joints but the wrist is not considered because it extends to allow the grabbing of the ball. From the graph you can notice that the shoulders are already starting off in an extended position of 43.98˚ and the elbows are flexed at 66.94˚. The shoulder and the elbow gets almost fully extended to catch the ball. The extension of the shoulder goes up to 121.69˚ and the 173.80˚. The elbows did not undergo a full extension to catch the ball so that the arms can counter the force the ball was carrying as the hands will be able flex to cushion the ball towards the body.

### Squats

The gym exercise that have been chosen for Mitchell Forster is squat. The squat has a similar position as the slips catchers where the person starts off with a standing anatomical position then flexing the knee and the hip to go to a sitting position then back up to the standing anatomical position. In this analysis, the upper limb was not taken into consideration because it is in a neutral compared to the slips catch which requires the use of the hands. The hips start at a neutral position then goes into the flexion of about 65˚. The knee goes into further flexion of about 92.59˚. The ankle undergoes a little dorsiflexion to stabilise the body as the body goes down, where it went up to 2.43˚.  The body is then brought back to the anatomical body position of standing with the plantar flexion of the ankle to the neutral anatomical position, the knee is extended to the neutral anatomical position followed by the hip which then returns back to the anatomical neutral position.

#### Annex A

##### Slips Catch (Lower Limb)
 Ankle plantarflexion Time Angle/˚ Starting Angle 0 -0.63 1.15 -1.57 1.3 -3.96 1.25 6.42 1.34 39.34 1.45 58.48 1.58 48.44 1.8 10.37 1.85 0.91 End Angle 1.92 -1.23

 Hip extension Time Angle Starting Angle 0 64.73 1.13 82.67 1.23 86.28 1.33 94.73 1.48 130.14 1.68 184.91 1.86 129.43 2.21 92.33 2.32 87.56 End Angle 2.77 65.87

 Knee extension Time Angle Starting Angle 0 95.32 1.15 103.62 1.4 117.42 1.43 140.05 1.7 165.22 2.03 179.42 2.25 163.24 2.77 142.58 2.9 107.32 End Angle 2.94 96.33

#### Slips Catch (Upper Limb)

 Elbow Extension Time/s Angle/˚ Starting 0 113.06 0.42 133.71 0.79 151.21 Finishing 0.85 173.8

 Shoulder Extension Time/s Angle/˚ Starting 0 43.98 0.57 78.85 1.4 101.21 Finishing 1.85 121.69
##### Squats
 Knee Flexion Time/s Angle/˚ Starting 0 0 0.4 30.12 1 65 1.12 84.72 1.25 92.59 1.72 86.27 2.04 74.11 2.25 22.32 Finishing 2.65 0

 Hip Flexion Time/s Angle/˚ Starting 0 0 0.42 12.12 1.02 32.71 1.25 45.92 1.5 65 1.63 43.27 2.29 30.11 2.57 10.25 Finishing 2.76 0

 Ankle Dorsiflexion Time/s Angle/˚ Starting 0 0 0.37 0.77 1.03 1.29 1.31 1.99 1.55 2.43 1.77 1.09 2.01 0.83 2.24 0.28 Finishing 2.55 0

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