Muscle Contraction Explained | Concentric, Isometric, & Eccentric

TIME-STAMPS
00:00 - Intro
00:53 - Concentric
02:55 - Eccentric
03:55 - Isometric
05:15 - Recap
06:25 - Where to Head Next

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Have a great day and remember to move well, live well, and teach others to do the same!

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Dr. Jacob Goodin is a professor of kinesiology at Point Loma Nazarene University (PLNU), and holds a PhD in Sport Physiology and Performance from East Tennessee State University. He has over a decade of experience as a strength and conditioning coach and sport scientist from the high school to NCAA Division I levels. In addition to his role as a professor and research mentor, Dr. Goodin directs the Athlete Monitoring Initiative at PLNU, which provides testing and monitoring services to over 200 athletes yearly as well as research opportunities for kinesiology students.

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[vanessaviramontesPLNU]

Dr. Goodin, what an amazing refresh on the muscle actions of the body. I was reminded that eccentric is not simply just the "downward" motion of a concentric contraction, rather the control movement against gravity as a muscle is eccentrically contracting and controlling the weight. the muscle is actually becoming the antagonist resisting the force of gravity and the tricep extends the arm ( in the case of a bicep curl).

[karatemplin]

I love being able to continuously use this video as a refresher on the types of muscle contractions.

[MatthewDuPrey]

I really appreciate how this video went over all three of these really clearly and made it easier to understand.

[NatalieSeaholm]

This video did a really good job of refreshing my memory on the different types of contractions. I really appreciated the visuals for the eccentric, concentric, and isometric contractions so that I was able to compare it to our physical body.

[maryerickson]

I really appreciate the illustrations you drew when explaining eccentric vs concentric contractions. They were very helpful!

[ameliabrock]

The visuals are super helpful, thank you. The repetition of the terms in the video lectures and in class and how much they overlap makes it harder to forget things, which I appreciate.

[IvyBartlett]

I appreciate you mentioning how the bicep acts as the agonist during the concentric phase of the curl and as the antagonist during the eccentric phase. This really helped me connect the concepts of biomechanics and muscle contraction!

[ClaireStone-jqwg]

This was a helpful and concise refresher on the different muscle actions. When looking at isometric contraction I forget that there is more to it than just holding a position and that there are other ways to train isometrically.

[jakegellatly]

I like that you mentioned the bicep being the agonist in the concentric portion of the curl, and the antagonist in the eccentric portion of the curl. This really helped me to put the concepts of biomechanics and muscle contraction together!

[audreyoates]

This was such a great refresher! The visuals are super helpful as well as the explanations. Going back to the basics is always great!

[miadenava]

This video was a great refresher on different types of contractions. It is important to understand the differences for training designs because each of them plays different roles in muscle control and can affect strength development.

[dannicazambrano]

These were great illustrations of muscle contraction! I appreciate the explanation about there being equal torque in isometric contraction.

[moirabryson]

I really liked that you drew out the muscle and bone to give us a visual aid of the 3 types of contractions. Thank you!

[mollytucker]

I remember learning about the different types of muscle actions in structural kinesiology and having a difficult time truly understanding. However, like in many other cases, learning about them again helped me feel like I actually really understand this time.

[torilucht]

The diagram and drawing you created to differential between isometric, concentric, and eccentric contraction was very helpful and gave me a clear understanding for each one!

[ameliabrock]

Great breakdown of concentric, eccentric, and isometric muscle contractions! The explanation using the example of the bicep curl makes it easy to understand. I appreciate how you clarified the mechanics behind each type of contraction, especially highlighting the role of torque.

[wyattcarlson]

Going over the main muscle contractions was super helpful for me. Your diagram drawings are definitely better than anything that I could have made.

[emilywalker]

This video was helpful refreshing the different contractions. I appreciated noting that the muscles are agonists in concentric and antagonists in eccentric, alongside the resistive and muscle torque are equal in isometric. Going through the bicep curl was a lovely example, thank you!

[devynpryor]

I was confused about concentric and eccentric contractions and the lengthening and shortening for so long, after first learning it, so its always good to get a refresher.

[luciavaldez]

I have learned about the various muscle contractions before, but this was a great refresher. I also really enjoyed seeing the visuals you included in teh lecture. As a visual learner I always appreciate the use of visual aids along with words and definitions!