Neuromuscular System - Rate Coding, Motor Units, & Fiber Types | CSCS Chapter 1

[@douglas6743]

Sir, you are a saint for making these videos. And without constant ad interruptions... you are very generous.

[@DrJacobGoodin]

I appreciate it Douglas and am happy that these are helping you out! Feel free to share them with colleagues. More videos coming soon!

[@macynunez4455]

I have always found myself so amazed by the abilities of our body to unconsciously react to things as it does with the golgi tendon organ and stretch reflex! So glad it does!

[@Moniiiqueee824]

Best thing about these videos is that I can just pause, rewind and really soak in what you’re talking about on my own time. Like the all or none principle was pretty cool to learn about.

[@vanessaviramontesPLNU]

Dr. Goodin, the most interesting thing about this video to me was the difference between the type I , type IIa and type IIx. I love that I can reference these videos as I can listen to it in the car, when I cook, and to repeat it if I missed something.

[@ellieconiaris9073]

This has many helpful examples of how the different muscle fiber types work and their specific benefits and purposes

[@jamarmack9626]

The graph that you showed with the differences in fiber types was really helpful in learning the differences between each fiber type.

[@sydneyspradley5289]

A lotttt of information but you teach it in a way that isn't boring or overwhelming! I love the live drawings and notes instead of just reading slides as most teachers do.

[@DrJacobGoodin]

Thanks Sydney! Gotta keep it exciting :)

[@MatthewDuPrey325]

I really enjoyed how you went over the different muscle fiber types and applied them to actual athletic events because it made it very relatable to me so it made it easier for me to understand.

[@mollytucker567]

I found the table in this video that covered the different muscle fiber types to be very helpful. The table makes it easier to distinguish between these muscle fiber types!!

[@julianasum8481]

The distinction between each muscle fiber type was especially helpful when going over real life athletic events. It helped me conceptualize the information better.

[@moirabryson5042]

I really liked how you included the part about how we can then apply this knowledge of muscle spindles and the recruitment into training athletes to improve their force production. Thank you!

[@madelinejewelnebril2871]

This video helped me gain a better understanding of how motor units are recruited. I now understand that force output of a muscle can be through a change in frequency activation of the individual motor units, a change in how many motor units are activated, or a combination of both.

[@laurenwahl9715]

I liked the way that you explained the Golgi Tendon Organ. I have learned about this in other classes and I feel that you broke this down in an easier way to understand.

[@braedenmoore3743]

I really liked your explanation of the golgi tendon organ and how it is discharged when there is an extremely heavy load which makes the muscle relax instead of possibly tearing.

[@ClaireStone-jq4wg]

I liked how you showed us how this information can be applied to an athlete's workout program to improve their force production.

[@thelmasepulveda4481]

This video did a great job of explaining the different types of muscle fibers. Thank you for using examples to help better differentiate them.

[@miadenava585]

This video was informative and a good refresher on muscle fiber types and how the nervous system controls muscle contractions through motor recruitment. I also appreciate the charts that were given throughout this video.

[@tianguyen3897]

I think this is a great video, especially for students who have already taken A&P and needed a refresher. The section about the GTO clarified a lot for me; shoutout to the GTOs!!

[@makennakaczmarczyk7563]

I like how increasing loads in phases of training can increase rate coding and optimize neural recruitment. The muscle fiber type table was also very helpful!

[@kelli-lynroche8446]

I like how you not only talked about how the neuromuscular system works but also how to apply it to increase force and get stronger.

[@ChynnaKifer]

The way that you explained the different types of muscles fibers was very helpful! Especially when you addressed the strengths and weaknesses of each one.

[@evakoutelieris9550]

I really liked the table that you put in for the characteristics of different muscle fiber types! That was very helpful

[@ryanharris8481]

Once again this was a great fresher video when it comes to muscle fibers and proprioception! This Information is all coming back to me , thank you !

[@dimitricarrion6145]

I liked how you went over the steps that occur at the NMJ and I also liked how you went over the chart of the different muscles fibers and how they differ.

[@alannabergherm8046]

I appreciated how you applied the information presented to athletes and their performance! It helped me see the information through a different perspective.

[@bensonmutuvi8429]

Loving the specific yet clear explanation for each subject. Especially with the examples included.

[@luciavaldez2601]

I really liked the section of video where you broke down the muscle fiber types with major characteristic was really helpful for me! I will definitely be using this for future reference.

[@BrianaReynoso]

this video really helped clear some things up that I needed a refresher on from A&P. The visuals are incredibly helpful for me as well as the "key points" slides.

[@willhopkins4197]

Really loved the table that had all of the characteristics of the different muscle fibers. Super helpful for fully understanding the differences between the different types.

[@JonathanKozasky]

This video was really interesting. I liked the force production section and learning like how heavier load training helps activate more motor units at the same time and produce faster rate coding.

[@DevanneyBoyd]

The chart detailing characteristics of the main muscle fiber types is super helpful for comparing them and identifying key differences.

[@IvyBartlett]

I appreciated how you explained that the body isn’t uniform when it comes to motor neurons. For example, areas like our eyes and face have fewer motor neurons because they require precision, whereas our legs have more motor neurons. This is because the legs need to generate significant force for movement, even though precision is less critical.

[@NoelleDarquea]

What I liked about this video was being able to see the recruitment and rate coding chart given. I was able to visualize the faster the force output, the motor unit will move from #1 to #2 and so on.

[@sarahcox-barden]

another really good review of anatomy last year! I liked that at the end it was all connected back to how this is useful for a strength and condititioning coach

[@AylethLizarraga]

The graph was very helpful when it came to understanding fast-twitch and slow-twitch! First time hearing of these terms and I feel like it will be an easy topic

[@coreycollier973]

This was a great refresher of how the different neurotransmitters work to activate muscles.

[@audreyoates3242]

These explanations are so helpful, especially the muscle fiber types!

[@itslexus09]

Fantastic content. You know what you're talking about, are calm and intentional in your language. An easy listen because of all of those things. So happy to have found your channel!

[@emilywalker9462]

I enjoyed learning about the stretch reflex and how it is much more reactive, allowing the body to react quickly and subconsciously to external stimuli placed on the muscles. I am excited for when we learn later how to use this strategically. Thank you!

[@jupshaw]

This video allowed me to recall my knowledge of the physiology of the body. Great info!

[@DerekLinck]

The breakdown of the muscle fiber types in correlation to different sporting events was very interesting and fun to learn and think about. Great video and breakdown of the neurons as well.

[@xaviergamez5745]

I was a little concerned at first because I didn't remember 'rate coding' at the start but this video walked me through the concept so now I have a better understanding than I did previously.

[@isabellecousineau302]

I really loved the way you explained the all or none principle! I also liked the explanation on the golgi tendon reflex and how a heavy load causes the muscles to relax instead of causing injury.

[@melanieweirich8482]

I liked hearing about the different proprioceptors within our muscles. This is something we've recently been going over in A&P 2.

[@madelinehernandez8838]

Learning about the all-or-none principle was very interesting. All of the muscle fibers in the motor unit are able to contract and develop force at the same time.

[@kieranmccarty4050]

l love learning the all-or-nothing principle! I remember hearing it but it was a great refresh. Thank you Dr. Goodin!

[@maryerickson4093]

I really like the graphs and the tables you included, they are really helpful!

[@clairemasterson6031]

The explanation of fused and unfused tetanus really cleared some things up for me, thank you!

[@lexireynish5892]

As someone with high school anatomy and KIN1001 as my only background, I found this information super interesting and helpful. I'm interested to learn more about slow and fast twitch fibers!

[@matthewbeecher2592]

Cool video! I enjoyed relearning about action potentials, the synaptic cleft, and how motor units are defined.

[@emilydonahue8216]

The explanation of the three muscle fiber types was so helpful!

[@wyattcarlson7504]

I found it super interesting when you were talking about the frequency and rate that motor units are activated and how it directly related to the force produced in a muscle.

[@lucamarin8565]

This was a great reveiw from Anatomy, theres always so many little things I forget.

[@abartsch0022]

I liked how you showed how the body isn't totally homogenous in terms of motor neurons and how places like our eyes and face don't have that much since they are needed for precision while our legs have much more since they don't have to be that precise but also have to generate lots of force to be able to move us. Also I thought it is pretty cool how you explained how the GTO and muscle spindles all send and receive their signals from the spinal cord to make a reflex in order to protect the body. I also love how you relate this to real life athletes since it makes it much easier to picture and understand the differences between a fast twitch muscle and a slow twitch one.

[@avajgallo]

This was pretty easy to understand thanks to your detailed explanations!! Thank you!

[@thomaskinzler]

I've always found it interesting that muscles with great precision have fewer units per neuron, because it makes sense but I think it's neat that our muscles are structured differently depending on their purpose. I appreciate the distinction about action potentials and how it is the frequency that determines strength of a muscular contraction and not intensity of one AP.

[@kylesands9693]

I didn't know there was 3 different types of muscle fibers! I always thought there was just slow twitch and fast twitch. So fun to learn about!

[@matthewwadley4348]

Learning about the Golgi tendon organs were incredibly interesting. Especially since I remembered the bare minimum about them before this.

[@cutetwinkie47]

I enjoyed learning different techniques that athletes can use to improve force production because it is putting all the nitty gritty together and making it applicable!

[@hannahb872]

The part where you discussed more on the different proprioceptors we have within our muscles was very fascinating! Anytime the CNS is involved is it crazy to see what the body is able to maintain and preform at the same time when it is activated.

[@jakegellatlyperformance]

I think it's really cool how the muscle spindles' function is able to bypass the brain needing to signal our muscles to move in order to move quickly, and with precision when the stretch reflex is activated.

[@evaozimec]

I enjoyed learning how we can use our knowledge of the physiology of the neuromuscular system to help improve athletes' force production.

[@celinegriffin3244]

This video was great and very detailed! It helped me review again the muscle fiber types!

[@dannicazambrano]

Thank you for explaining how the rhythm of twitches relates to athletic performance. For example, how Type 1 (slow twitch muscle fibers) are common among distance runners and how fast twitch is more common among sprinters and throwers. Great example of the differences especially since sports like track and field include all of these different events though the training for each is very different.

[@emmasanchez5975]

I really enjoyed learning about the all-or-none principle and how the muscle fibers work. Thanks for the video!

[@torilucht5871]

I find differentiating between the muscle fibers to be interesting and incredible important when it comes to the varies types of athletes. Another point from this video that I found interesting is in regards to the neuromuscular system and how using heavier loads can optimize neural recruitment. I find this concept to be interesting and I appreciate all the information in this video!

[@aribhalla9820]

This was a super helpful review of motor units and muscle fiber types!

[@marshallhobbs46]

Thanks for these videos. I will be taking my CSCS exam in the next couple of days and it helps for me to listen to it when I drive to work. Question: do you have your students look at the videos and comment for a grade? Lol

[@morganrolleri9198]

Thank you for the great video! It was a great review of the muscle fiber types and the examples were very helpful!

[@Adam.gates_]

The reflexes involved in sudden loaded stretches are very interesting, and it is awesome to think about how we can use the stretch-shortening-cycle to improve athleticism.

[@myawilliams8357]

I like how we took the time to dive deeply into these last two topics, I feel like its going to help us learn better for the rest of seamster. Also I feel like a couple of us needed the refresher.

[@joshcombs123]

It is so cool to me that different athletes can have completely different types of muscles in their body based on the training they have done

[@oliviadyck510]

Woah. This had so much info that I had to watch it 3 times. Great review of stuff I learned in Exercise Phys!

[@DrJacobGoodin]

I've taught it now almost a dozen times in various classes and it still amazes me!

[@caleighgarcia7792]

It was very interesting and helpful to talk about the different types of muscle fibers and what they each do. This was a good review from my previous classes and helped to keep this information fresh in my mind!

[@aliciahernandez00233]

The all-or-none principle was interesting to learn about. Even though our body might produce a stronger action potential it would not necessarily produce a stronger contraction which is very intriguing.

[@brysonhashimoto2878]

I enjoyed the part where you talked about adding load to increase an increase of motor unit recruitment.

[@coach.bronson]

Great info. I have a very detailed question I emailed you about. Thanks for doing these videos. They are fantastic.

[@rozalynnlarson8835]

I really enjoy learning about the different types of muscle fibers. I think it's so interesting that different types of physical activity (such as long distance running compared to a sprint) require different types of muscle fibers.

[@milandiklic1080]

Just watch this video ! Thank you professor !

[@davidhaynes3269]

Hey Dr. Goodin! It was good to go over recruitment again. Also I enjoyed the video of what I assume is your son running at the end!

[@kennyvogan5673]

The proprioceptors were so interesting and how there are fast neurons that only go to the spinal cord to give them quick commands. The GTO was the most interesting to me because its protecting the muscle from damage!

[@everoche3754]

I find it interesting to hear about the functional capacity of muscle fibers and how no two people have the same distribution of muscle types in their body.

[@jadenrea1109]

I thought the slide covering the muscle spindle in relation to the spinal cord was super interesting and helpful. It is interesting to think that all of these mechanisms are happening each time a muscle is contracted.

[@ameliabrock]

I think the difference between stretch reflexes from the spinal cord and what we think of as "reflexes" (repeated trained actions that the body may perform subconsciously) is very interesting :)

[@TRamos-pl6oo]

the all or none principle is pretty interesting to me. it just shows the complexity of the human body even more

[@jackmalone5800]

I thought the difference between commonly known muscle tone and actual muscle tone regarding tension throughout the muscle was a very interesting distinction. Also really liked to hear about how athletes can work specifically to increase force production.

[@joyshang5670]

I liked learning about proprioception and how it the muscle spindles activate the sensory neuron and connects it to the spinal cord.

[@connorhill4598]

Think its really cool to think that the GTO is safety precaution for the muscles when something heavy is placed on it.

[@cameransherwood5157]

It is fascinating to see how some muscles that are so precise only have one muscle fiber per motor neuron where others that are less precise can use hundreds!

[@vincentyacobozzi3882]

Thanks for these. Getting ready for my cscs and reading just doesn’t work for me. This is great

[@DrJacobGoodin]

Happy to help 💪

[@wyattsimms4472]

My favorite part of the video was when you talked about how athletes can apply this knowledge to their training. It kind of gives a better reason to understand something this specific when coaching seems to not usually look this deep into things.

[@sampru8181]

Hi, do you have cardiovascular and respiratory system part of chapter as well in KZbin videos?

[@wyntonbrown9439]

Really interested in learning about the all or none principle

[@cjbuenviaje]

I think the All-Or-None principle. As I was listening and reading the slide, my calf (gastrocnemius to be more specific) started to spasm and got me thinking about how the WHOLE muscles was involuntarily contracting.

[@MosesReuben]

YOU ARE THE BEST! Love these videos. So helpful!

[@joshuawada8783]

More action potentials means a higher force production. It wasn't mentioned in the video, but I wonder if the GTO reflex is based of a certain voltage or certain peak of action potentials that causes the muscle to relax. The GTO threshold can be trained to activate later, but why is that? is that the GTO receptors becoming less sensitive to the stress? or the body adapting?

[@DrJacobGoodin]

Yep, as part of the nervous system, GTO signaling is highly plastic and trainable!

[@mikecraven7325]

Dr. Goodin, I have a question maybe you can answer....At 10:43 in the video the slide to the left is showing Recruitment of more motor units and Rate Coding. Looking at the very bottom of the slide, it appears the first motor unit recruited has the highest impulse frequency for rate coding. Is the first motor unit a Type 1? I am under the impression that that the Type 2B would have the highest impulse frequency for rate coding, but these motor units appear at the top of the slide with less rate coding? Am I interpreting this correctly? I also have another question...Is impulse frequency, discharge rate, and rate coding all referring to how complete tetanus causes the strongest or most powerful contraction?

[@momdadmuhlnickel3097]

Dr Goodin, could you add a simple overview of the cardiovascular and respiratory systems as found in Ch1 right after motor units and proprioception? Your videos have been incredibly helpful as I study for my upcoming CSCS exam. Thank you!

[@sarathrajendran6716]

Thank you for this video😊

[@VirAquinoPLNU]

Considering the role of muscle spindle and GTO's, what kind of neuromuscular mechanism are at play when someone deadlifts a really heavy weight and starts having reaction like vomiting or nosebleeds? is there a muscular-gut neural connection there?