Biomechanics Lecture 11: Gait

In this biomechanics lecture, I discuss the mechanics of the human walking or gait cycle including key events, joint angles and muscle activity.

[@louwit3221]

Spent 4 hours in class trying to understand this, just for the teachers to decide that the way they told us was not good enough and that we needed to do it ourselfs with the powerpoints they provided us. Ofcourse i understood nothing of it. Now i understand it completely within just 30 min. I am so greatfull that you made this video so that i can pass my exam with the correct infromation!

[@RehabScience]

I’m so glad the lecture helped you!

[@carateume4041]

i just wanna say a HUGE thank you to your lecture series! it helped me go through our biomechanics class in PT school. you even teach better than my professor in some topics just like this! thanks for making this subject more digestible and less complex!! i hope you make more of these soon!

[@RehabScience]

So awesome to hear that my lectures were helpful! Thanks for the message!

[@budlawrence4847]

That was excellent The way you broke it down with one Gait cycle to me was very digestible! Thank you very much

[@morin6661]

Hi, Thank you very much for the series. I am currently learning how characters move in animation and these are good points to know what to look into. Thank you once again!

[@misselik]

You literally uploaded this video right when I needed it! just started to learn about gait in my classes at uni.

[@RehabScience]

Love it! Perfect timing!

[@BeeSaucySkateboarding]

Thanks so much for this free information. Every lecture i learned something that will help me rehabilitate an injury in one of my family members! I am also a skateboarder so the lower extremity lectures were especially helpful

[@RehabScience]

So glad to hear the lectures were helpful!

[@timothyvanpelt_cyclist]

I think you explained it clearly again! Thanks a lot. I shared your lectures with some fellow PT students.

[@RehabScience]

Glad to hear it was easy to understand. Thanks for sharing these lectures!

[@kyleewilson9326]

PHENOMENAL video! So so so helpful, thank you!

[@RehabScience]

Thank you! Glad it was helpful!

[@user-ln2uu2px8v]

Thank you for your lecture. Watching your video makes me want to study English more. I'm currently an athlete and I'm receiving a lot of help with rehabilitation through your videos and Instagram posts.

[@RehabScience]

I am so glad to hear my videos have been helpful to you! Thanks for commenting!

[@arshifiroz3376]

me watching all the lectures 1 day before my masters biomechanics exam XD Thankyou for such informative and concise series ^_^

[@RehabScience]

Haha! Glad the lectures were helpful!

[@jolicska]

you are the best and I'm grateful as always! Thank you God bless!

[@RehabScience]

I’m glad the lecture was useful!

[@infaliblefit]

Please put your other classes up! Such good info!

[@RehabScience]

So glad you enjoyed the lectures! I will try to do a few of my other ones soon.

[@LevysFitness]

Such a great video!!

[@RehabScience]

Thank you, friends!

[@freeman3097]

I’m glad I came across your channel as I am 53 years old and sit for extended periods of time daily as part of my work. Joint function and gait function are some of the basic functions of the body that I grow to appreciate more and more every day. Question; if the greater fatigue factor in a long walk was hip extensor muscles, would that indicate a problem in flexibility or pelvic alignment? Thanks!

[@RehabScience]

So glad to hear that you are finding my channel to be helpful! Gluteal fatigue during long walks does not usually signify flexibility or pelvic alignment issues. It really probably just points to a muscle endurance issue, which can be improved with glute focused resistance training.

[@freeman3097]

@@RehabScience thank you for the answer.

[@robertbissett]

Great video. Except for two issues... at 13:25 you talk about "pushing off" with the toe and no mention of the pelvis in the gait. What do I know about it? I've been living it. Sixteen months ago I ruptured my Achilles tendon. A month in the boot, non-op, calf atrophied with loss of strength, then in a shoe, but being very careful, using a cane. Walking with a limp became the new normal, a new habit. Been trying to relearn how to walk ever since. I began watching videos by experts like yourself who all said that pushing off with the toe was required. I focused on rehabbing that calf, but it didn't respond and still hasn't to this day. Then the peroneal tendonitis started and calf work was impossible for about five months. Every step was painful. I was not capable of pushing off. At 78 I was beginning to think I was going to walk with a limp the rest of my life. I found a PT who, against the accepted wisdom, said there is no push off from the toe. Even your video of the woman walking backwards on the treadmill you can easily see she is not pushing off with the toe, but rather lifting the toe and swinging the leg forward while maintaining forward momentum with the opposite leg pulling her forward. There is some minor calf involvement as weight is shifting to the other leg, but not an actual push off. It's true some do push off with the toe, but doing so causes a bouncing gait which is odd looking and less efficient. I began to focus on swinging that rear leg forward which helped a little, but still limping. I came across a mention of the pelvis in walking. "Don't walk like a robot", the fellow said as he walked exaggerating the motion of the pelvis. So, about two weeks ago I began to focus on the motion of the pelvis as the leg swing begins. Presto, the limp instantly disappeared. I could hardly believe it! After all these months and so simple a fix. It felt awkward and five or six times a day I'd forget and start limping again. Now, after a couple weeks it feels more normal. Running is not possible for now since that requires more calf strength than I have. I'd be interested to know what you think about all that.

[@93hothead]

From those points on the knee, ankle. Is it possible to get the heel strike angle and toe off angle?

[@aleealy1541]

7:51 initial contact 9:22 loading response 10:18 mid stance 11:09 terminal stance 12:12 pre-swing 13:10 toe off Swing Phase 14:09 initial swing 15:04 mid swing 15:37 terminal swing

[@victorgl9709]

Thank you! So informative!

[@RehabScience]

You’re welcome!

[@dimitrisretsinas5580]

Great work and video thanks for sharing! Just a question . From loading response to mid stance why are the dorsiflexors work concentric and not the triceps surae eccentric and also from mid to terminal why do not the plantarflexors work concentric? Thanks.

[@RehabScience]

These things are often difficult for people to grasp when first learning gait. From loading response to mid-stance, the dorisflexors must contract concentrically (muscle fibers shortening) to pull the tibia forward to achieve the vertical tibia position that is seen in mid-stance. From mid to terminal stance, gravity and momentum are causing the ankle to fall into dorsiflexion, so the plantarflexors must contract eccentrically (muscle fibers lengthening) to control this movement. Does that help?

[@MONEYVAL9]

where can i get those sample footage shown here in the begining of the walk cycle?

[@pavendank8072]

very nice.. thanks so much

[@sehrishkhan4908]

Hello ! Really happy to find such stuff over gait my doctor taught me gait so bad can you please me by answering this question i'll be really grateful You said in person doing dorsiflexion the gastrocnemius are working to control dorsiflexion so while doing dorsiflexion the tibialis anterior will be contracting concentrically ?? And gastro ecenterically ?? So gastrocnemius working there as ecentrically to perform concentric function in next phase?? Please help me

[@boschulte]

I'm a dancer trying to explain to people how to use their ankles in dance. It's like I am vomiting heresy to say that you need to eccentrically contract the dorsiflexing muscles. There's a rampant idea that plantar flexion is the only good kind in dance... this explains a lot... in dancing we do an exaggerated walk which simply amplifies most of what you said here... incredible.

[@RehabScience]

I hope the video gave you some new ways to explain the importance of the dorsiflexors. Many people struggle with understanding eccentric contractions.

[@boschulte]

@@RehabScience Ok, so I am not alone. Dancers tend to think in contractions only as that seems to produce power. However, I believe understanding things like this 'eccentric contraction' create a much better narrative for movement by allowing the dancer to flow with 'reality' in framing better images to model their movements. I would love to know more about the other potential energy storing and releasing systems found in ligaments, fascia and tendons. The supination of the foot by the inverters on release to the first swinging phase is interesting also. That greatly improves our action if we understand this! Dancers are so obsessed with contraction, plantar flexion and eversion of he foot we fail to realize that our bodies move in magnificently complex ways if we let it just do so... I saw this explanation here: kzbin.info/www/bejne/o33Ph2CJg8ualbc at 4:29

[@caiomuracadezevedo2573]

Something that may help you to get the muscular activities easier to understand, eletromyographic data overlaping with the gait phase (there are some studies that use this kind of graphic representation). Also, something that could be talked about in this lecture is the elastic energy restitution after the excentric contractions. (I'm not quite fluent in english yet, but i hope my comment is understandable and not writen in a rude way)

[@RehabScience]

Those are great suggestions. Maybe I will update this lecture at some point in the future.

[@djeje7afyee181]

can you please send me the link of the studies

[@youreworthyourweightinavoc7189]

Thanks, that was all really clear 😀

[@RehabScience]

Glad to hear that!

[@fatmael-zahraaabdel-rahim7461]

I made it 180 likes, thank you so much for the great video!

[@RehabScience]

Haha, thank you!

[@majedkh8043]

Highly appreciate, are you going to do lecture about abnormal gait and talk about the right intervention?

[@RehabScience]

I don't have a lecture on that topic at the moment, but I will try to do one soon.

[@MuhammadIlyas-dk2lb]

can we get the slideshow for studying later?

[@marinestud10]

This is awesome

[@RehabScience]

Thank you!

[@altamaskhan3172]

Thank you ❤

[@ProdipDeb19]

Awesome sir, could you please share the ppt here?

[@beautifulmotherlove]

thanks you for the clarity. my question- if you recognise a phase whic you dont do as the instructions here. how do you teach it to your trainee? just by awareness>? bones repositioning?

[@RehabScience]

Sorry, I don’t understand your question. The phases shown here include all of the phases of the normal gait cycle.

[@beautifulmotherlove]

@@RehabScience what i meant is: once you recognise a deviation from this perfect gait (in a perfect human being) how do you talor an excercise to this shortage? for ex: if you recognise that the trainee skips the laoding response and moves directly from heel strike to midstance: how would you train him to recapture thje missing movement?

[@user-wb9zf4yy7m]

Hi，if the patient's pelvis is initiated from a position of 5 degrees of posterior rotation during the INITIAL CONTACT phase and is accompanied by downward tilt" of the pelvis on one side at an angle of 13 degrees, what does this reveal?

[@user-wb9zf4yy7m]

The patient's right hip has just had a hip replacement.

[@MrFilipalter]

Yees thank you,you are the best

[@RehabScience]

Thank you 🙏

[@saaedahmed7434]

thank you so much

[@RehabScience]

You’re welcome!

[@studywithcupoftea7187]

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[@noorsatti1791]

More lectures please 🥺😭

[@RehabScience]

I’ll try to do more soon 👍

[@joshuarichards9365]

I think i injured my glute medius 2 years again and slowly im losing gait support. And my left upper leg is much smaller than my right it feels very uncomfotable especially walking. I have no stability whatsoever

[@RehabScience]

Sorry to hear that. You might find the exercises in my gluteus medius video below to be helpful. kzbin.info/www/bejne/hJWpqHebrsecatUsi=R5VkEcOJN7MAV_qE

[@mikeliao3445]

More lectures please :). Pretty please?

[@RehabScience]

Haha! I am thinking about doing some of my pain science lectures. Would that be of interest?

[@kaylasouter6231]

@@RehabScience I'd love that, as a new grad PT

[@DereinzigwahreAkede]

The Girl on the treadmill is not Walking correctly, the lateral Side of the foot is under way to much load in final stance. Her hips are to much rotated outward. She ist Not rotating inward as much as she should, so her big toe does Not Provide the thrust Forward IT IS supposed to. Also entirely Missing the rotating component of the hip, because you only watch in one plane. Modern gait Assessment is supposed to watch at least sagital and frontal plane...

[@RehabScience]

I didn’t have a 3-D camera set up. Yes, of course we analyze gait from all three planes of motion!

[@drrubinakhan1812]

At the end I am confusing with all the stuff 😭😭

[@RehabScience]

It’s a lot of information to take in and can get quite confusing.

[@user-cf1iw7tf3k]

heel first contact ain't healthy or natural

[@RehabScience]

You are incorrect. The human gait cycle has been heavily studied for more than 50 years. A heel strike is the normal pattern in the healthy human walking gait cycle.

[@user-cf1iw7tf3k]

just some sunday afternoon trolling, thanks for the video series@@RehabScience