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 American Council on Exercise » For ACE-certified Fitness Professionals ONLY » ACE-certified Personal Trainers ONLY » Stiff leg deadlifts

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Author Topic:   Stiff leg deadlifts
JM
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My supervisor is telling me that the stiff leg dead lift does not work the hamstrings. Why then do my hamstring die every time I do the exercise. Are there any resources (NASM…) that I can take her and slap her in the face with? Am I wrong?

JM
Posts: 13 | From: Livonia, MI USA | Registered: 11-09-04
akyoda32
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lol YOU ARE NOT WRONG...any anatomy book should show that the "hamstrings are a two jointed muscle that can be worked through either the knee or the hip. Is you supervisor certified? This is a basic anatomy argument and you should approach it as such, where are the insertions and origins of the muscles of the hamstrings...what happens when those two points are brought closer due to muscular contraction?
You get hip extension and knee flexion! If you take out the knee flexion with a stiff leg movement you get ....(dramatic pause)...hip extention. What movement occurs in a RDL(stiff leg deadlift)... hip extension!
uummm if you get hip extension in both scenarios then....RDL's work the hamstrings through the hip and presto you won the argument.
Posts: 209 | From: Fairbnks,Ak,US | Registered: 09-13-07
hlawson
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Agreed! You're supervisor is clueless -- the pain in your hamstrings the next day isn't imaginary!
Posts: 239 | From: Schenectady, NY, USA | Registered: 12-18-06
akyoda32
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lol well said!
Posts: 209 | From: Fairbnks,Ak,US | Registered: 09-13-07
JM
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Thanks for the input

JM
Posts: 13 | From: Livonia, MI USA | Registered: 11-09-04
david c
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When muscles contract they contract from the insertion toward the origin. The origin does not move. The origin of the hamstrngs are in the hips. Thats why most hamstring exercises are leg curl type. Back flexion does not work the hamstrings.
You feel the dead lift in the hamstrings, because you are actually stretching the muscle and adding weight. Look up stretches for the hamstrings and you will find at least one back flexion exercise to stretch the hamstrings.
don't smack your boss quite yet.
Posts: 111 | From: stephens city virginia | Registered: 06-04-05
Bishop
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david c,

WOW, I don't even know where to begin.

Could you possibly be confusing "spinal flexion" vs "hip extension"?

You are aware that one can fix the distal aspect (insertion point) when executing movements?
[Maintaining extension at the knee to prevent active insufficiency one can exhibit what was once coined "shunt properties" of the muscle group]

Concerning the physiological theory of muscle contraction and its neural recruitment... you may want to take a college A&P 101 course to get you up to speed.

One more trivial bit of information; not all the hamstrings connect to the ischial tuberosity. One of the origins of the biceps femoris (key word here is biceps) is attached to the femur (linea aspera).
Posts: 95 | Registered: 12-26-05

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