Biomechanics and Muscle Leverage | CSCS Chapter 2

[@moirabryson5042]

Having the pictures of the muscles along with the descriptions of different classes of levers helped a lot. Thank you!

[@pupibruja]

I'm slowly turning from a gym rat to a biomechanics expert. Thank you for this golden information.

[@madelinehernandez8838]

Biomechanics was a class I struggled to remember terms and concepts. Having an overview, especially on the three different levers really helped.

[@AylethLizarraga]

All the visuals provided help a lot when I'm trying to understand difficult topics. Trying to understand First-Class Levers was somewhat challenging and the visual makes everything connect

[@tolitosjones3431]

Just wanna give you a big thank you! Passed the Science portion because of you.

[@charmenatchison854]

Sometimes just hearing it isn't enough. The visuals WITH the explanations help so much!

[@ClaireStone-jq4wg]

This was a helpful refresher on what I learned in biomechanics! Classifying different levers can be challenging, but this video helps to go more in-depth on the differences and examples.

[@macynunez4455]

I absolutely loved that you included the example regarding the patella's role for quad levers. So interesting to think about how intricately were are designed and how something so "small" really plays a huge part in affecting our mechanical advantage and also allows us to move better!

[@mollytucker567]

I just took Biomechanics last semester and definitely already needed a refresher. I appreciate the depth you went into on levers. Listening to explanations is much easier for me to understand as opposed to reading in the textbook.

[@IvyBartlett]

I really loved that you included the example of the patella's role in quad levers. It's fascinating to consider how intricately we’re designed, and how something seemingly "small" plays such a significant role in improving our mechanical advantage and enabling smoother movement!

[@maryerickson4093]

I took biomechanics and muscle leverage was a little difficult for me to understand, and you explained it well! This was a great refresher

[@bdakridge17]

Great videos - but question - when we are observing how the moment arm changes for the resistive force at 16:20, we are looking at a bicep curl. You say 'this is all just for a first class lever' but wouldn't a bicep curl be a third class lever?

[@DrJacobGoodin]

You're correct! The biceps is a 3rd class lever, thank you for pointing that out @bdakridge17, much appreciated.

[@clairemasterson6031]

Hearing the explanation of the different levers really helps me grasp how each works.

[@vanessaviramontesPLNU]

Dr. Goodin, the most interesting part of this video was understand moment arms and levers. I found it so hard to understand in my real biomechanics class where I could have just looked here for an awesome break down. I enjoyed the detailed and very interesting action of the patella in the mechanical advantages of the body, one of the few.

[@jupshaw]

Awesome video for those not only studying for the CSCS but also for general knowledge. Very helpful!

[@aliciahernandez00233]

Thank you Dr. Goodin for the refresher on biomechanics as I took it with Dr.A last fall. Reviewing the levers and how different forces affect the moment arms and force.

[@miadenava585]

Thank you for this video Dr. Goodin. This was a good small refresher on muscle leverage in the body! I appreciate how you went over the different types of levers and how they influence the efficiency of movement and production of force!

[@Moniiiqueee824]

Having already taken a biomechanics course and enjoyed it, I found this video to be a great refresher. Kinetic and kinematic can be confusing but having a clear definition always helps.

[@lexireynish5892]

All of this information was so interesting! One fact that stood out to me was how our tendons are subject to more force than that force that is externally exerted by our hands or feet. Shows how intricate our skeletal musculature is.

[@joojotin]

Have you ever thought of applying this to bodybuilding training, in example finding the best exercises for muscle growth biomechanically like Doug brignole has done?

[@nelacostabianco]

Every serious strength trainee needs to buy Doug's book 'The Physics of Resistance Exercise' - best investment you'll make!

[@joojotin]

@@nelacostabianco what kind of results did you get with it?

[@nelacostabianco]

@@joojotin Doug's exercise biomechanics insights are revolutionary. Better results with less time. Ex. Doug's 'early phase loading' principle helps eliminate useless exercises when you understand that there is a correlation between the strength curve of the muscle and the resistance curve of the exercise. So choosing the best exercises is key for better results.

[@joojotin]

@@nelacostabianco absolutely agree

[@laurenwahl9715]

I enjoyed the way you explained the components of the levers. It is a concept I have always somewhat struggled with but the way you detailed it made it much easier to comprehend. It is interesting that the mechanical advantage or disadvantage is so dependent on how much force is necessary!

[@matthewbeecher2592]

I appreciated the introduction into the three classes of levelers in biomechanics. It's a little tricky to understand but I felt like you've done a great job at helping me.

[@luciavaldez2601]

The way that you broke down the different levers was very helpful to me! I was a little confused regarding the chapter in the textbook but the way you described it, along with the visuals was very helpful to me.

[@Chasebowen23]

I have not taken biomechanics yet but this little intro to it makes me excited to take the course!

[@thomaskinzler]

Having taken Biomechanics a year ago, this was a great refresher on leverage and how moment arms work. The piece about how the patella allows for an increase force production is fascinating to me, because despite not being a very thick bone, it still plays a key role in force generation. I tend to mix up the types of levers but I think remembering the muscular examples for each would be very beneficial.

[@devynpryor8228]

The photos really helped get a better grasp on what a moment arm is, after just reading the chapter.

[@NatalieSeaholm]

I really enjoyed watching this video on biomechanics and muscle leverage. I have never taken a biomechanics class before so i felt this was a good introduction for myself

[@NoelleDarquea]

Thank for this quick introduction on levers. Skeletal muscles are way more complicated than they seem with all the biomechanics involved

[@torilucht5871]

This video provided a great reminder about the three different levers and how they compare to each other. I also appreciate the examples and explanation you provided for each one. The biomechanics of strength training is very interesting to me so I enjoyed this video.

[@kelli-lynroche8446]

This was a great review of biomechanics. You explain concepts in a way that just makes so much sense.

[@DerekLinck]

Really liked the diagrams and subsequent explanations you gave. Made it easier to picture the muscles moving and skeleture movements associated with it.

[@ChynnaKifer]

I like how you explained mechanical advantage with drawings because it helped me visual what is taking place! Thank you!

[@ellieconiaris9073]

Helpful review of all the biomechanics that is definitely a little rusty after a year! very detailed video!

[@dimitricarrion6145]

The bicep curl example of a lever disadvantage helped me understand the concept because of how you explained the distance from the origin and where the weight is being lifted from.

[@karatemplin]

In anatomy and x phys and other courses we have talked about actin and myosin cross bridges. I had not put too much thought into levers and moment arms in terms of lifting. I think my favorite part of this lecture was seeing and learning about the comparison of the quadriceps both with and without the patella.

[@ryanharris8481]

I always had trouble grasping the concept of muscle leverages and moment arms. This video helped me gain more understanding of both of these topics!

[@DevanneyBoyd]

The breakdown of the three lever classes helped clarify some of the things I found confusing. It is also fascinating how much of our skeletal muscle operates at a mechanical disadvantage.

[@VirAquinoPLNU]

This video is very helpful and a great refresher from biomechanics class from 2 semesters ago

[@emilywalker9462]

This was a very helpful video. I was a little confused with the levers, but the wheelbarrow analogy perfectly clarified it. Thank you!

[@sarahcox-barden]

This was a super interesting video as I have never had a good description of lever in the body. The classes are still a little confusing for me but I can always come back to this video and watch again. Excited to dive into how levers give advantages and disadvanatges for different workouts and even different body types!

[@wyntonbrown9439]

Really loved learning about the patella. As an athlete that deals with patellar tendoinits, it was interesting learning more about what goes on and how it works.

[@TheGrantSystem]

Thank you so much for the video and information given. I am a visual learner so watching this video gave me better understanding opposed to reading info straight from the text

[@matthewwadley4348]

Learning about the three classes of levers was absolutely fascinating and the functions of them as well

[@makennakaczmarczyk7563]

I enjoyed learning about the three classes of levers. The figures provided were very useful to helping me understand each better.

[@BrianaReynoso]

Biomechanics seems like a very intimidating subject but i'm glad I can come back to these videos. I will definitely be going over the levers again but your video was a much better way of learning this matter rather than the textbook.

[@JonathanKozasky]

I really liked learning these different levers and how it affects mechanical advantage. The images were a big help especially understanding (M) values.

[@MatthewDuPrey325]

Learning about all of the different forces that are used by the muscles was a very interesting topic especially with how levers were talked about.

[@willhopkins4197]

I really appreciated the different examples for each of the classes of levers. They were all blending together in my mind but the examples helped me understand the differences between each of them.

[@saeternj]

I thought the breakdown of mechanical advantages and disadvantages was super helpful. Understanding how crucial the moment arm plays in the two factors makes a tremendous difference.

[@austinlaff6449]

I'm a new grad PT starting to study for the CSCS, and this is a fantastic overview of my first year biomechanics basics, thanks for the great info Dr. Goodin!

[@cameransherwood5157]

Such a good refresher from the biomechanics class I was able to take with Professor Aguinaldo this past semester! Seeing these visuals always helps me better understand how our body works.

[@chrismangram8463]

Really helpful video and the relativity to the strength aspect of it made it easier to understand.

[@blaisepastel4505]

Taking a lot of notes and digesting a lot of these concepts, thoroughly. Not perfect nor an expert but definitely believe I am learning greatly.

[@tianguyen3897]

Learning about muscle leverage through the textbook was tricky for me because I was unable to picture it in my head. However, your demonstration of what a lever is with your pen was extremely helpful. Thank you!!

[@celinegriffin3244]

I liked how you gave examples of specific exercises for each of the levers because it helped me visualize between which muscles are resisting and operating when doing the movement. Great video!

[@everoche3754]

Biomechanics was always a hard subject for me, but the examples that you gave, like the wheelbarrow, were helpful in painting the picture more clearly.

[@evakoutelieris1633]

This video does a really good job at explaining the three different levers. Thank you!

[@joyshang5670]

I learned a lot about the components of the lever since that section was more difficult for me to understand. I really liked the wheelbarrow analogy for the second class lever. Thanks for the help!

[@jakegellatlyperformance]

The wheelbarrow example really helped me understand exactly what creates leverage. I also think it’s really cool that we can determine whether a muscle is at a mechanical advantage or disadvantage based on whether the equation AF/RF comes out to a number lower or higher than one.

[@milandiklic1080]

I am feeling ready for the quizz tomorrow !

[@wyattcarlson7504]

It was really interesting to learn about the concepts of levers and how the forces that levers produce apply to different parts of the body.

[@nataliesenyk6210]

THANK YOU SO MUCH for these instructional videos. Absolutely great dissection of relatively complex topics!

[@abartsch0022]

I like how you always make sure to include a real life example like how when we do a push up, it is considered a second class lever. And it is interesting so see how our body has to work so hard for movements that we think are natural and easy. Also how can you tell how long the moment arm is?

[@kgomotsomaila7283]

I admit doc, you have inspired me to study more...its cool how articulate everything related to your craft

[@davidhaynes3269]

Thanks for the explanation of the levers, It was nice to review because I had struggled with this in biomechanics

[@madelinejewelnebril2871]

The mechanical advantage of the patella was interesting to learn about and how it maintains the distance from the quadriceps tendon and the axis of rotation of the knee.

[@emilydonahue8216]

This was a really helpful summer of levers! I always get confused on the different classes of levers, but this was straightforward!

[@audreyoates3242]

This was a great refresher on biomechanics! This topic has always been complex and a little difficult for me to grasp, but the explanations were so helpful!

[@isabellecousineau302]

I appreciate the biomechanics refresher!

[@emmasanchez5975]

This really helped me understand the different classes of levers and it makes sense now! Thank you

[@caleighgarcia7792]

It is super interesting how even though it is shown that we produce a certain amount of force, we are actually producing even more due to the considerable mechanical disadvantages of our muscles.

[@evaozimec]

This really helped me understand levers better. It's crazy to think that most of our musculature is operating at a mechanical disadvantage. I found it interesting that when we test athletes' foot contact on force plates, the force shown is that produced by the feet however, what's not shown is the force that our musculature had to overcome because its operating at a mechanical disadvantage.

[@jadenrea]

It is interesting to dive into the physics and mechanics of muscle movement how muscles pull at certain angles to create force and where those forces are being applied. It was also interesting to see which joints were associated with each type of lever.

[@alannabergherm8046]

It was really interesting to me how you highlighted the patella and its unique mechanical advantage. I also didn't realize that that our muscles frequently operate at a disadvantage mechanically???

[@aribhalla9820]

Interesting to learn about how force relates to muscular movement! Excited to learn more about this in Biomechanics this semester.

[@mragowo]

I don't know who would give a dislike for such an informative video for free. Must have been the bicep joke.

[@avajgallo]

I've never studied muscles and exercise from a biomechanics point of view and this was very interesting!

[@avajgallo]

*biomechanical haha

[@rozalynnlarson8835]

It was interesting to learn about the differences between first, second, and third class levers.

[@kylesands9693]

The wheel barrow example was awesome to remember the second class lever by! P.S. I will now squat and occasionally envision the patella's movement giving me power.

[@jamarmack9626]

Learning about the mechanical advantages was really interesting to me because I had never learned that there are certain movements in which our muscles have an advantage, which makes it easier for us to lift more weight.

[@VincentMiles-g4v]

Great topic: what would the class lever for a back squat be? Would the axis be the hip joint? Would the torso and the femur be considered the arms? There’s two reasons for these questions. 1. If the hip is the axis and the bar sits on the upper back while moving eccentricity(resistance) the force(weighted barbell) really isn’t on the posterior side of the axis. It’s sits just over the hips or possibly a little on the anterior side. 2. If a person is tall (6’6 or taller) they most likely have a long torso, femur and tibia bone which makes it a little harder to keep the bar over center of mass. PS I’m currently taking Kinesiology 😊

[@Adam.gates_]

The three types of levers and how they effect force output was very interesting to learn about. I was shocked to hear that it takes 8x the force of the weight when working your triceps.

[@joshuawada8783]

Wow, I never realized that the knee cap was more than just a bony pad to stop the tendon from rubbing on the bone! I always thought it was simply to reduce friction, but it also acts as a psuedo-pulley to increase the amount of force that is translated from the quadriceps, making the system just a little more efficient. The human body really is amazing.

[@DrJacobGoodin]

Mine is also a percussion instrument thanks to all the cracking and popping from years of running!

[@Joeducci8]

Stupendous video Jacob!

[@TRamos-pl6oo]

I thought the difference between the different classes of the lever classes were really interesting, and definitely something that I had not learned before.

[@cjbuenviaje]

I think the use of a force plate is so interesting to measure force and contact! Hope we get to see that in this class or in other classes!

[@thelmasepulveda4481]

I learned about the different types of levers and I really appreciated the examples for each. I was surprised to know that most of the skeletal muscles operate at a mechanical disadvantage.

[@matthewfish2786]

Pronator teres is also a flexor of the elbow joint. I would argue that pronator teres is best described as an agonist during elbow flexion. If one focused on supination during elbow flexion, either dynamically or isometrically, then I would argue pronator teres is best described as a synergist. There is definitely some inherent ambiguity in muscle classification depending on the details of any given movement.

[@coreycollier973]

I had not known the difference between each lever class before watching this video.

[@oliviadyck510]

It is so crazy how you've done 1,000 bicep curls today! Lol. I never thought how the pronator teres muscle could be a synergist to a biceps curl because they seem like completely unrelated muscles. However after you explain it, it makes so much sense! Thanks for helping me think outside the box.

[@DrJacobGoodin]

haha I was just doing my best Anchor Man impression. My biceps tendon feels inflamed just thinking about doing 1000 curls in a day...

[@cutetwinkie47]

Biomechanics has always been confusing for me to grasp, but this video was helpful in recapping mechanical advantages and the lever system.

[@joshcombs123]

I found the segment on the patella and its affect of leverage advantage very interesting. I had no idea it was optimal to have a patella for leverage.

[@jakegonzales1367]

Of all my years in anatomy I did not realize how crucial the patella actually is. Being a anchor for the quads as well as creating distance of the quadriceps tendon form the axis of rotation.

[@tonybianchini6084]

Thank you for doing these videos! Make studying for the CSCS test a lot easier

[@mattiapapa8248]

Amazing man, so much more clear!

[@sarathrajendran6716]

Well explained as usual❤️

[@SuperhumanUnchained]

Great video Great workout Great channel Great content Great athlete Great motivation and inspiration keep doing what your doing and I Will always support you and your channel and thanks for the upload

[@DrJacobGoodin]

Thank you so much. Will do!

[@julianasum8481]

In this video, I learned about the biomechanics of the three different types of levers, while also applying those concepts to mechanical advantages and disadvantages.

[@jackmalone5800]

So cool with 2nd class levers like the ankle that the calves and soleus can lift our whole bodies due to the mechanical advantage, even though they are relatively smaller muscles.

[@mikestatz5098]

nice video Dr. G!