Linear Speed and SAQ

speed

change in distance over time

what is the force experienced by sprinters

ground reaction forces

impulse

the area under a force-time curve, which represents the change in momentum of an object over a specified time interval.

more area under the force-time curve, in a shorter amount of time means

a faster sprinter

rate of force development

developing maximal force in minimal time, a shorter time is more desirable in sports

improvements in rate of force development are a result of

inc in muscle-tendon stiffness

changes in muscle type

enhanced neural drive during stretch shortening cycle

types of training that inc rate of force development

resistance training, plyometric training, sprint training, olympic weightlifting

what two variables describe force in athletic activities

rate of force development and impulse

spring-mass model

is a biomechanical model that represents the relationship between a spring-like behavior of muscles and tendons, analyzing how they store and release energy during movement. used to depict sprinting in non-elite sprinters

how do elite sprinters generate greater forces to attain faster speeds

higher knee drive and non-compliant ankle

stride

one footstrike to the next same same footstrike

length of stride increases through the acceleration phase

what is sprint speed determined by

stride length and stride rate

what are the two primary limiting factors influencing sprint performance

rate of force development and proper biomechanics

what happens to stride length as stride frequency increases

it plateaus (at transition and top speed phase of sprinting)

what type of muscle fiber type is best for sprinters

type ii (fast twitch), faster Ca release, fatigue quickly

phases of sprinting

drive, transition, top speed

what phases of sprinting make up the acceleration

drive and transition phase

submodalities linear speed

resisted sprinting, assisted sprinting, form drills

resisted sprinting

improves drive

assisted sprinting

improves top speed

starting positing for spring

3-point stance w one hand on the ground in line w shoulders (the other cocked back), front leg w 90 knee bend and angled shin, back leg at and 133 deg angle, hips higher than shoulder and weight leaned forward

technique for drive and acceleration phase

drive back knee forwards, collateral syncing,