cricket fast bowlers

7/28/2019 Cricket Fast Bowlers

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FORCES DURING BOWLING STRIDE Every step of bowler generates a force that is 2.5x your body

weight through your foot, and for a fast bowler the impact atthe point of delivery jumps up to 9x.

During bowling three different forces act at the front and backfoot and the magnitude of these differ between the feet.

The largest forces are the vertical forces which are attenuateddirectly up the leg and they can be anything from five to nine

times the individual's body weight, so they really are quitelarge forces. The braking forces can be in the vicinity of two to four times

body weight There's a high force on the front leg on initial contact. That

force has to be absorbed somewhere by the natural shockabsorbers [of the lower limb], that might be through ankle

joint motion or knee joint flexion They take a lot. Yet many players give only short consideration

to the boots they wear.


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Science of foot

There is little doubt that the best way for our feet to function is barefoot. That may seem a surpriseto those who have been brought up on the common knowledge of more cushioning and moresupport. We are designed by nature to be able to walk, run, hunt and gather without shoes . Ourfeet have an incredibly thick skin and amazing feedback system that works with the supportmuscles in our legs and hips to allow for heavy impacts and excellent balance.Various studies have backed this up:

Runners with old shoes are less likely to be injured than runners with newer shoes. The more cushioning in your shoe, the more likely the injury. The thicker and harder the sole of your shoe, the worse your balance becomes.

On top of this, injury rates in fast bowlers continue to increase despite increases in cushioning andsupport in their shoes. I have also seen anecdotal evidence with basketball players that the moresupport the shoe gives your ankle, the weaker and less flexible the ankle becomes.

Despite this evidence, walking into any shop that sells trainers or cricket boots shows you the

opposite: More support and more cushioning.Where does that leave our poor feet in all this?It's a personal thing. Most of us can't play barefoot after years of conditioning our feet to be inshoes. We have to find a compromise. The more we can do to minimise the risk of injury with ourfootwear the better


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Science of foot contd

Cut Cut is how high the boot goes up your ankle. With cricket shoes the two options are high cut bowlingshoes and shoe cut boots for batting and fielding.

Fast bowlers are the main users of bowling boots as they are designed to support the ankle. As we are notbowling in bare feet, the chance of slipping in medium cut boots and socks is higher, so this is sensible.But we already know that this can reduce the range of motion of your ankle, another injury risk.Spikes Unless you are a fast bowler, the spike in your boots is a matter of preference. There are 4 main options: Full spike Half spike (where the spikes are just at the front) Rubbers (with no spikes, just rubber moulded grips) Adjustable (can add or remove spikes and replace with rubber)

Fast bowlers need a full spike for the extra stability. Always wear them unless you are prevented from doing

so by playing on artificial surfaces.


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MODIFIED SHOES

Fast bowlers in cricket often modifyrunning or cross-training (asics 490tr)shoes by adhering a stiff, spiked soleover the existing sole in an effort togain an edge over the competition.


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Footwear in cricket: issues facing podiatrists treating fast bowlers ;Chris Bishop, Dominic Thewils (2011)

BackgroundThe choice of footwear and custom modification of footwear in fast bowling in cricketlacks biomechanical and clinical evidence. This demonstrates that despite professionaladvice being available, elite fast bowlers continue to wear shoes that may not beappropriate for them. The aim of this study was to investigate the biomechanicaleffects of three cricket shoes commonly used by fast bowlers and whether footwearmodification could play a role in injury.

MethodsFour male cricket fast bowlers were included in the study. A 20 camera VICON Mxsystem was used to collect three-dimensional kinematic data. A four segment markerset was used to track and model the lower limb. Four force platforms (Type 9287 BA,Kistler) were positioned at both back and front foot strike to capture kinetic data.Participants perceptions of footwear were measured using a VAS. Freidman two-way

ANOVA with post hoc pairwise comparison was used to analyse the differencesbetween shoes. Linear regression analysis was used to correlate predictive outcomemeasures.


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RESULTS

The custom modified cross-trainer (ASICS 490tr)demonstrated the highest participant perceptionfootwear score (mean 9/10 VAS). The conventionalcricketshoes (ASICS 170no) demonstrated a significantreduction in front foot lateral shear force (P = 0.038)and a

significant decrease in front knee joint external rotationmoment (P = 0.022) relative to the custom modifiedshoe (ASICS 490TR). Exploratory regression analysis

identified that front foot peak lateral shear force wassignificantly correlated (R 2= 0.75, P < 0.001) to sagittalplane knee joint angle at initial contact. Sagittal plane

knee joint angle at initial contact was also significantlycorrelated (R 2= 0.73, P < 0.001) to front foot loadingrate.


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Cricket

Introduction Played in British

Commonwealth nations Limited Literature on

mechanisms & preventionof cricket injuries

Player and associated injuries Bowler

Hamstring

Ankle injuries Batsman

Impact injuries Limb injuries

Fielder Limb injuries Ankle injuries


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Protection and avoidance

Using protection equipment Helmet Pads Gloves

Clothing Cool clothing e.g. ClimaCool+ by addidas

Footwear Cut, Spikes, Cusioning, Protection


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cricket fast bowlers

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