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Biomechanical analysis of an inciting event of ankle sprain on basketball players

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The aim of this study is to understand the main kinematics an electromyography differences in basketball players during the dynamic activity that causes more sprained ankles in basketball: jump to unstable surface. 24 elite basketball players, (12 females, and 12 males) underwent the same test procedures consisting of five consecutive jumps in unipodal support... EMG data (1600 Hz) was recorded using bipolar, pre-amplified surface EMG electrodes (Daisy Lab), placed over four lower leg muscles (Tibialis Anterior TA, Peroneus Longus PL, Gastrocnemius Lateral GL and Medial GM)... Motion data (100 Hz) was recorded using an electromagnetic tracking device with 3 sensors located in each segment (foot, shank and thigh) of lower limb... Data was analyzed in four phases of movement: prepare to jump, push-off; ascending flying and descending flying that culminate on the contact moment... Konradsen findings suggest a risk for ankle sprains when there is an ankle-position error... Although differences on landing moment are far more obvious for the ankle, they also become visible for knee flexion... Healthy subjects showed more knee flexion and less ankle plantar flexion on contact which gives them a better arrangement for lower limb impact absorption and creates a safer position for ankle load... They also showed lower muscle activity for all muscles with exception of TA which contraction is significantly different on both groups on landing... This study identified different movement behaviour for the lower leg of healthy versus previous sprained ankles during the jump, which could possibly prevent the athlete from preparing for contact and supporting moment, leading to an ankle sprain, especially because of an ankle position in greater risk... Healthy athletes take more time preparing lower limb for contact moment and further load... These findings also suggest that healthy athletes manage to arrange a better position for lower limb to land, which may be a sign that there might be necessary to train athletes' jumps in "safe positions" in order to prevent ankle sprains.

No MeSH data available.


Athletes jumping a) from a stable surface to b) an unstable board.
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Figure 1: Athletes jumping a) from a stable surface to b) an unstable board.

Mentions: 24 elite basketball players, (12 females, and 12 males) underwent the same test procedures consisting of five consecutive jumps in unipodal support. Barefoot athletes with (NS) healthy (n = 17) and already sprained (S) ankles (n = 28) were asked to jump from the floor to an unstable surface in all directions (round Freeman board) placed 50 cm in front of them. Three experimental jumps were executed before data collection to familiarize the subject with the protocol and maximize the height of the jump (figures 1ab). This design aimed to reproduce the most vulgar mechanism of ankle sprain in Portuguese basketball players: landing in another player's foot, which temporarily becomes an unstable surface. EMG data (1600 Hz) was recorded using bipolar, pre-amplified surface EMG electrodes (Daisy Lab), placed over four lower leg muscles (Tibialis Anterior TA, Peroneus Longus PL, Gastrocnemius Lateral GL and Medial GM). Motion data (100 Hz) was recorded using an electromagnetic tracking device with 3 sensors located in each segment (foot, shank and thigh) of lower limb.


Biomechanical analysis of an inciting event of ankle sprain on basketball players
Athletes jumping a) from a stable surface to b) an unstable board.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2562096&req=5

Figure 1: Athletes jumping a) from a stable surface to b) an unstable board.
Mentions: 24 elite basketball players, (12 females, and 12 males) underwent the same test procedures consisting of five consecutive jumps in unipodal support. Barefoot athletes with (NS) healthy (n = 17) and already sprained (S) ankles (n = 28) were asked to jump from the floor to an unstable surface in all directions (round Freeman board) placed 50 cm in front of them. Three experimental jumps were executed before data collection to familiarize the subject with the protocol and maximize the height of the jump (figures 1ab). This design aimed to reproduce the most vulgar mechanism of ankle sprain in Portuguese basketball players: landing in another player's foot, which temporarily becomes an unstable surface. EMG data (1600 Hz) was recorded using bipolar, pre-amplified surface EMG electrodes (Daisy Lab), placed over four lower leg muscles (Tibialis Anterior TA, Peroneus Longus PL, Gastrocnemius Lateral GL and Medial GM). Motion data (100 Hz) was recorded using an electromagnetic tracking device with 3 sensors located in each segment (foot, shank and thigh) of lower limb.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

The aim of this study is to understand the main kinematics an electromyography differences in basketball players during the dynamic activity that causes more sprained ankles in basketball: jump to unstable surface. 24 elite basketball players, (12 females, and 12 males) underwent the same test procedures consisting of five consecutive jumps in unipodal support... EMG data (1600 Hz) was recorded using bipolar, pre-amplified surface EMG electrodes (Daisy Lab), placed over four lower leg muscles (Tibialis Anterior TA, Peroneus Longus PL, Gastrocnemius Lateral GL and Medial GM)... Motion data (100 Hz) was recorded using an electromagnetic tracking device with 3 sensors located in each segment (foot, shank and thigh) of lower limb... Data was analyzed in four phases of movement: prepare to jump, push-off; ascending flying and descending flying that culminate on the contact moment... Konradsen findings suggest a risk for ankle sprains when there is an ankle-position error... Although differences on landing moment are far more obvious for the ankle, they also become visible for knee flexion... Healthy subjects showed more knee flexion and less ankle plantar flexion on contact which gives them a better arrangement for lower limb impact absorption and creates a safer position for ankle load... They also showed lower muscle activity for all muscles with exception of TA which contraction is significantly different on both groups on landing... This study identified different movement behaviour for the lower leg of healthy versus previous sprained ankles during the jump, which could possibly prevent the athlete from preparing for contact and supporting moment, leading to an ankle sprain, especially because of an ankle position in greater risk... Healthy athletes take more time preparing lower limb for contact moment and further load... These findings also suggest that healthy athletes manage to arrange a better position for lower limb to land, which may be a sign that there might be necessary to train athletes' jumps in "safe positions" in order to prevent ankle sprains.

No MeSH data available.