charts Flashcards
Early flight mm activation
ecc hip fl
ecc knee ext
mid flight mm activation
con hip - accelerates thigh forward
ecc knee ext –> ecc knee fl
late flight mm activation
con hip ext -> rotates thigh backward in prep for foot contact
ecc knee fl stops just before foot strike aided by con knee fl
early support mm
cont con hip ext
brief conc knee fl followed by ecc hip ext - resists tendency to hyperext
ecc plantar
late support mm
ecc hip fl
con knee ext
con PF
Athlete is superficially attempting to maintain an acceleration phase when the shins are clearly vertical.
max velocity sprint
improper mvmt patterns
Instruct the athlete that as the shins and hips come up to vertical, so should the torso and head. Encourage the athlete to feel for the rise in the hips so that the joints (shoulders to hips to ankles) stay stacked or in line. This position allows for the proper transmission of forces into the running surface.
Athlete is not displaying optimal front side mechanics with regard to the height of swing leg knee.
inadequate force production
Recall that the swing leg’s knee height (traditionally
called front side mechanics) is purely a display of ground reaction forces. Improper cueing an athlete to lift the knees may result in further improper transmission of forces and ultimately change the musculature naturally used during the sprint event.
athlete overstriding
Success in sprint events results from the ability to produce high vertical forces in a short amount of time. an athlete overstriding is attempting to inc speed via larger ground contact times, which ultimately dampens the effects of SSC instruct to run in their lane and maintain natural gait
athlete is displaying chronic hamstring injury or pain
high likelihood of hamstring injury occurs during swing phase of sprint event as result of ecc force. an athlete is further compromised when displaying anterior pelvic tilt during the sprint event. Before training or competition, mobility and soft tissue therapy may be warranted in order to stabilize the pelvis in a neutral position.
Athlete is attempting to
“cycle” the leg action, resulting in an increased time to complete the swing phase. This is made apparent by the open gap between the knees during the stance phase
Instruct the athlete to drive the foot down and back into the track, not paw. Due to the seemingly horizontal movement of the foot during a sprint, coaches often miscue athletes to paw the foot into the track.
Pawing the foot horizontally against the track prevents the athlete from using vertical forces, overloading the stretch-shortening cycle to move down the track.
athlete is displaying erroneous arm mvmt in transverse plane
While traditionally coaches would claim that erratic arm movement is a symptom of fatigue, much literature suggest that speed is limited by mechanical force app, not metabolic efficiency. under this newer model, coaches should emphasize driving the arms down and back while maintaining an upright torso
the coach should recommend to the althere the the arms swing recover near the midline of the body in order to take advantage of the GH joint natural ROM
hips too high in start
Instruct athlete to space feet by 1.5 to 2 foot lengths, then lower into starting position by dropping the shin of back leg to be more parallel with sprint surface.
athlete stepping out laterally during initial drive phase
Instruct athlete to push or drive through the ground to initiate the sprint.
Athlete’s arm movement is abnormally short and tight.
Instruct the athlete to either (a) drive the elbow down and back or (b) pull the hands down and back so as to simulate pulling on a rope. In addition, cue the athlete to allow the hands to fully break the waist while also allowing the arms to recover at midline of the body
unnecessary tension in dorsal mm; neck hyperext
Instruct athlete to keep head in line with spine, as the torso and head should rise at the same rate during the acceleration and transition phases of the sprint
