Eccentrics and explosives

F x displacement

work =

smoothen movements and create shock absorption

eccentric activity during gait cycle helps ___

initial contact

gait cycle eccentric: glute max

initial contact → terminal stance

gait cycle eccentric: glut med

initial contact → loading response; initial → terminal swing

gait cycle eccentric: hams

initial contact → loading response; pre-swing → initial swing

gait cycle eccentric: quads

initial contact → loading response

gait cycle eccentric: DFs

midstance

gait cycle eccentric: PFs

greater F production, consumes less O2 (more fatigue resistant)

main characteristics of eccentrics

eccentric

better for pts w/ pulmonary disease

increases

eccentric: F increases as speed ___

decreases

concentric: F increases as speed ___

fast; slow

to max F production: ___ eccentric and ___ concentric

DOMS

edema accumulation and return of glycogen storage is delayed

repeated-bout effect

protective neural adaptation from DOMS

tensile strength

eccentric exercises are good to increase t ___ which helps the t become less susceptible to injury

heel drops: 3x15, 2x/day, 7 days/wk, 12 wks

achilles tendinopathy exercise and parameters

mild pain (5/10); no discomfort

tendinopathy: work thru ___; increase load when ___

isokinetic eccentrics

saved for final stage of rehab

plyometric

explosive movements are a component of ___ training

explosive movements

ex: upward jog, step up, lift heavy object overhead, start of sprint race

F x velocity

power =

speed

most often manipulated when trying to improve power

fast twitch

power movements have greatest energy expenditure since greater # of ___ ms are activated

fast twitch

m cells that are energy inefficient

power training

not recommended for pts w/ conditions that result in low energy reserves