Zyglamail said:How bout squats, deads and straight leg deads? Deads may need to be spaced out every other week or so cause they can really wipe your ass out at first. I havent done leg curls or leg extension in years.
Needsize, notice I said they can wipe your ass out at firstneedsize said:
I totally agree with the leg extensions thing, right up there with the pec dec in total uselessness. But I kinds disagree about spacing the deads out, I pull very heavy and do it every week (as well as squats), and have never had a problem. I maybe take about 4 weeks a year off from deads. I recover fine and my back is still growing like a weed, but I guess it might be different for some.
needsize said:
I totally agree with the leg extensions thing, right up there with the pec dec in total uselessness.
Show me any powerlifter who relys on leg ext/curl and not the squat or dead for leg strength.....my guess is you wont find one. Im not saying they dont use them but most will often times use them in everyday routines but once the start to prepare for a meet they drop them and concentrate on the big exercises. Now, if the leg extension/pec dec is so great for strength why dont they use them more often than not?Fatty4You said:
I disagree with this totally. Leg extension and pec deck are both fantastic exercises.
Leg extensions can be great to warm up my knees and quads. They are also good to pre-exhaust before squats. Also, after sqauts, I can use leg extensions to really concentrate to feel fibers that I dont feel during squat. For instance, i feel the lower part of my quads during squats, but i can really feel the upper parts of my quad fire during leg extensions. Plus, i feel that i have some control over what gets emphasized with the way i point my toes. Plus, i can do partial reps at different angles to work any kind of weekness.
And pec deck, i can't imagine not liking it. I get the most tremendous burn from it and my pump is out of this world. Its one of my favorite chest movements. And, my strength in it has gone up very fast!
Maybe i am just a freak or something, but these exercises shoudl not be overlooked.
-Fatty
Zyglamail said:Needsize, notice I said they can wipe your ass out at firstmeaning at first it may be a good idea to space them out when first switching. If he has not been doing any of these exercises and immediatly jumps on all three he could be a hurting unit and it may take some time to build up to weekly use of all three together. By all means if you have the recovery power to do them all every week go for it, but I find most, if hitting them all hard will overtrain if they are not eased into a bit.
Zyglamail said:Show me any powerlifter who relys on leg ext/curl and not the squat or dead for leg strength.....my guess is you wont find one.
Fatty4You said:Now, you say, "Show me a powerlifter, blah blah blah", well i say, show me a bodybuilder who never uses leg curls/extensions as part of their workout? I have never met one in person.
-Fatty
Since your goal is to be objective, then why the comment on exercises that are likely to cause injury? Are you aware that it has been clinically proven that the stresses on the knee from leg extensions are much more severe than those from squats/deads? Injuries on the compound movements are not cause by the exercise, its caused by improper form.Fatty4You said:To say that no one should ever use a particular exercise [except those that are likely to cause injury] is to be foolish and ignorant.
I am not trying to be offensive, i just think maybe you are to engrained in your ways to see things objectively.
-Fatty
No problem, you've worked hard and it definatly shows.needsize said:Thanks for the props Zyg
Your not alone here. Think about it, there isnt a guy on this planet who has built noticable mass using these simple movements. Regardless of the amount of importance people place on these isolation exercises they simply do not give the mass that most of us are looking for.needsize said:One thing that I became an "expert" on was what didnt work for me, and all of the machines like cables, pec dec, leg extensions, etc, never built me any size. The only stuff that ever worked was the heavy compound movements. I wish it were different though, if I could use a machine to build say a big back, without having to deadlift well over 500lbs for reps like I have to, I'd be all over that.
There are actually many but I dont currently have them bookmarked or anything. If I get time I will try and dig some up. If your joints are in good shape and the exercise does not cause you pain or discomfort you are likely not doing any harm. I was just trying to point out the fact that the actual sheering forces have been measured and due to the support under the upper leg and downward weight applied to the front of the shin, you are actually applying sideways pressure on the joint and all the stress is placed directly on tendons/ligaments. Even in a deep squat the primary forces are applied to the socket itself where they are supposed to be.Fatty4You said:I have not heard that leg extensions have been shown to cause injury. If so, than i can accept that. I am seriously interested in this actually. Do you know of an article I could read about it. I do leg extensions as a final burn exercise, or as a prefatigue exercise, and if they are causing my damage, I should like to stop.
If you could point me to an article or a study that would be great. Thanks,
Fatty
Bah, dont sweat it. Argueing...or should I say debatingFatty4You said:Zyg, Thanks for the info about the leg extensions. I feel kinda like a dick having argued, and all the while I was the ignorant one.
An analytical model of the knee for estimation of internal forces during exercise.
Zheng N, Fleisig GS, Escamilla RF, Barrentine SW.
American Sports Medicine Institute, Birmingham, AL 35205, USA.
An analytical model of the knee joint was developed to estimate the forces at the knee during exercise. Muscle forces were estimated based upon electromyographic activities during exercise and during maximum voluntary isometric contraction (MVIC), physiological cross-sectional area (PCSA), muscle fiber length at contraction and the maximum force produced by an unit PCSA under MVIC. Tibiofemoral compressive force and cruciate ligaments' tension were determined by using resultant force and torque at the knee, muscle forces, and orientations and moment arms of the muscles and ligaments. An optimization program was used to minimize the errors caused by the estimation of the muscle forces. The model was used in a ten-subject study of open kinetic chain exercise (seated knee extension) and closed kinetic chain exercises (leg press and squat). Results calculated with this model were compared to those from a previous study which did not consider muscle length and optimization. Peak tibiofemoral compressive forces were 3134 +/- 1040 N during squat, 3155 +/- 755 N during leg press and 3285 +/- 1927 N during knee extension. Peak posterior cruciate ligament tensions were 1868 +/- 878 N during squat, 1866 +/- 383 N during leg press and 959 +/- 300 N for seated knee extension. No significant anterior cruciate ligament (ACL) tension was found during leg press and squat. Peak ACL tension was 142 +/- 257 N during seated knee extension. It is demonstrated that the current model provided better estimation of knee forces during exercises, by preventing significant overestimates of tibiofemoral compressive forces and cruciate ligament tensions.
A measurement of anterior tibial displacement in the closed and open kinetic chain.
Jenkins WL, Munns SW, Jayaraman G, Wertzberger KL, Neely K.
Department of Physical Therapy Education, School of Allied Health Sciences, East Carolina University, Greenville, NC 27858, USA.
Anterior displacement of the tibia during knee extension movement has been identified as a possible factor in anterior cruciate ligament (ACL) reconstruction failure due to the increased stress placed on the graft, leading to a creep response in the healing graft. Nineteen healthy subjects with a unilateral ACL deficiency were evaluated in an open and closed kinetic chain. A KT-1000 was used to measure anterior displacement of the tibia on the femur during isometric open and closed kinetic chain exercise at 30 and 60 degrees. An analysis of variance for repeated measures followed by Newman-Keuls multiple comparison tests were performed to determine the differences between the open and closed kinetic chain for the involved and uninvolved knee. Statistically significant differences were found when comparing the amount of anterior displacement between the open and closed kinetic chain for the involved and uninvolved knee at 30 and 60 degrees. Clinicians utilizing isometric exercise in rehabilitation of the anterior-cruciate-deficient and the anterior-cruciate-reconstructed patient should be aware of the increased amount of anterior tibial displacement when comparing open and closed kinetic chain exercise.
Comparison of closed and open kinetic chain exercise in the anterior cruciate ligament-deficient knee.
Yack HJ, Collins CE, Whieldon TJ.
Department of Physical Therapy and Exercise Science, State University of New York, Buffalo 14214.
The purpose of this study was to quantify the amount of anterior tibial displacement occurring in anterior cruciate ligament-deficient knees during two types of rehabilitation exercises: 1) resisted knee extension, an open kinetic chain exercise; and 2) the parallel squat, a closed kinetic chain exercise. An electrogoniometer system was applied to the anterior cruciate ligament-deficient knee of 11 volunteers and to the uninvolved normal knee in 9 of these volunteers. Anterior tibial displacement and the knee flexion angle were measured during each exercise using matched quadriceps loads and during the Lachman test. The anterior cruciate ligament-deficient knee had significantly greater anterior tibial displacement during extension from 64 degrees to 10 degrees in the knee extension exercise as compared to the parallel squat exercise. In addition, the amount of displacement during the Lachman test was significantly less than in the knee extension exercise, but significantly more than in the parallel squat exercise. No significant differences were found between measurements in the normal knee. We concluded that the stress to the anterior cruciate ligament, as indicated by anterior tibial displacement, is minimized by using the parallel squat, a closed kinetic chain exercise, when compared to the relative anterior tibial displacement during knee extension exercise.
Fatty4You said:
Leg extensions can be great to warm up my knees and quads. They are also good to pre-exhaust before squats.
And pec deck, i can't imagine not liking it. I get the most tremendous burn from it and my pump is out of this world.
-Fatty
Iwillbe said:Leg curls and extensions haven't been doing shit for me.
What do you think about squats, front squats, and hack squats for a leg workout? Too much of a similar thing? Or is there enough variation between each version?
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