≥ :*
>
gastric contraction
↓kneeÑ%Éi
iii
↓ knee
¥
↑ ankle joint power
plantar flexion
É
Hamstring Contraction
☒
→
Extension
d knee
↓ knee NSM
Ñ%ij → ↑ hip Nsm
extension
_
Extension
Rectus Femoris Contraction
Extension
↑ knee Ñ%Ñ
↓ hip NSM
quads } hamstrings
↓ hip NSM
have
reciprocal
'
relationship
hamstrings operate on ascending limb of force length come
-
Assuming quasi static trunk position his extensor /abdominal
-
,
functions to Posteriorly pelvic Tilt pelvis
force couple
-
posterior
pelvic tilt in this context
↳ pelvis on femur
hip extension
↳ LIR acetabular
① in sagittal plane around medial lateral
-
axis
↓ lordosis
↳ assuming fixed trunk
WEE
*¥÷←
*
¥
Assuming rectus abdominis SuffrenHy contracted
anterior pelvic tilt would increase hip flexion moments }
a
reciprocally inhibit the
hip extension
hamstrings from contributing to
.
Moment Arms at hip in sagittal plane ( in Cm)
Rec Femi 4.3
flexion
semi membranous i 4,6 extension
semi tendinous i 5.6 extension
alate Min Anterior Fibers are 1.0 flexion for reference
Posterior pelvic tilt would contribute to pressing ability
off the floor for the deadlift :
1) Shift to ascending limb of force length
curve
2) Hamstrings have large femoral moment arms
& assuming
-
subjects
then
PPT
Hip Extension Moment > Hip flexion moment
should
manifest
v1 maximal force production
.
3) Internal rotation torque ↑ w/ hip flexion Las
%
keep in
↓ Hip flexion mL
a
generalization
↓ hip external rotation restriction
mind in different contexts , like sprinting,
hip flexion would
↑ peak
hamstring torque
.