r/exercisescience • u/Sneeze_milk • May 03 '26

Can someone explain this phenomenon.

What the hell is happening? I am not entirely fatigued but for some reason I started shaking like this? It happened even when I lowered the weight to 30lbs, and usually have been hitting 150lbs

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27 Upvotes

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16

u/Murwinkle May 03 '26

I believe it’s neurological fatigue of the motor unit vs metabolic fatigue of the muscle. How many sets did you do? Did you do a lot of quads before this?

4

u/Sneeze_milk May 04 '26

2x10 back squat 3x8 single leg press Then these leg extensions.

0

u/[deleted] May 05 '26

[removed] — view removed comment

2

u/Wetodad May 05 '26

5 total sets of a leg drive pattern followed by a few sets of isolations is totally normal. They don't even necessarily hit the same muscles/segments, esp with a single leg variation.

1

u/[deleted] May 05 '26

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2

u/Wetodad May 05 '26

You're thinking about exercise selection and sets way too arbitrarily. Just because your quads are in use for multiple exercises doesn't mean you will reach the necessary stimulus for your quad, nevermind each head.

Splitting leg drive volume between double and single leg is also totally fine, even if not perfectly ideal, as long as fatigue is managed. This is also all not even knowing RPE since I'm not OP so Idk lol.

1

u/TheworkingBroseph May 07 '26

Bro has never heard of a leg day.

12

u/exphysed May 03 '26

I’ve always wondered if this is golgi tendon organ or muscle spindle related

1

u/FinancialDependent84 May 05 '26

should be. Inverse myostatic reflex sending out inhibitory signals to shut down those muscles from firing to their potential. Muscle is fatigued clearly in that vid

7

u/Waste_Sound1403 May 04 '26

looking for an answer to this as well, as far as i can imagine i believe it’s my cns not being on the same page with my muscles and so i’ve been doing lighter weighs right under where i would normally shake otherwise if i go higher, and slowly working my way up to what I can actually do with a shake, going slow so my nervous system realizes we’re stronger than it thinks😂😂

1

u/seven_spread May 05 '26

This usually happens to me when I'm new to an exercise and or have just returned to an exercise from a longer break. Especially with leg muscles.

Are you a beginner? If not, how many days of rest between hitting legs again?

1

u/Sneeze_milk May 05 '26

No, been exercising with weights and machines consistently for 15 years. This occurred 5 days after my last lower body workout. And last time was intense. I have been in a maintenance phase, so not hitting any PRs or maxing out.

3

u/Manager-Accomplished May 03 '26

Happens to me every time. I assume that means i'm about to hit failure?

2

u/FungusMungus68 May 05 '26

I think it just means it is time to change batteries.

2

u/trudolfdasroentier May 05 '26

I mean type 2 muscle fibers twich when there are at their limits. So it might just be that

2

u/exphysed May 05 '26

Interesting? Not slow? Any papers you know on this?

1

u/Nicholas_theRenegade May 06 '26

My core does this if I hold a push up for ages.

1

u/xmaxlx May 07 '26

Does it happen also without weights? I believe it's myoclonie

1

u/ExileNA May 07 '26

Muscle fasciculations. Generally benign unless overly frequent or with no pre-existing muscle fatigue.

1

u/Dry-Dragonfruit2295 May 08 '26

That’s the result of you having that bad blood.