Hello,
I would like to compare the neuromuscular function of the contralateral legs via twitch interpolation technique at the same time. Since the exercise will be performed with two legs concurrently, I would like to keep the time between cessation of exercise and neuromuscular function test to be the same between the legs.
Are there any studies that have done this? Do you foresee a significant caveat?
Hi Sanghoon,
Just to be sure, you are doing something like a bilateral leg extension fatiguing task, and then you put them on isometric mode and perform an ITT ?
So you are asking the participant to push with both legs while you stimulate the nerve (or muscle belly) of the right and left leg at the same time?
The only thing that I'd personally recommend is to synchronize your stimulators so to deliver the stimuli at the same time to both legs AND to have a separated force encoder or torque meter for each leg. Being sure that each leg is expressing max force or checking if there is pretension at rest before the resting stim is delivered can be tricky though, but interesting.
Usually even if the task is bilateral, one leg is measured (e.g.
- https://europepmc.org/article/med/28930862
- Article Effects of pre‐induced fatigue vs. concurrent pain on exerci...
- https://onlinelibrary.wiley.com/doi/full/10.1111/j.1748-1716.2012.02471.x?casa_token=HXED22qcby0AAAAA%3AbbINNuTtOamZqmc1TZgsh_4BZ8zewwC4Tig4L4GmAiUG_YH7XrzG_3-GAiwu75AKLVV-HV2gJYGbx1Vc_g
- Article Oxygenation time course and neuromuscular fatigue during rep...
etc...)
And, maybe more relevant for your study:
Article The role of active muscle mass in determining the magnitude ...
Sorry I can't think of any study measuring both legs.
Cheers
Hello Giorgio,
Thank you for your response. Yes, we will be performing bilateral leg extensions and perform the ITT every minute of the task.
That is a great point about the pretension especially since we will have to strap the two strain guages (one for each leg) following the dynamic knee extension bout and before the ITT.
I will have those papers a read! It's interesting that ITT with both legs have not been performed yet...
Kind regards
"... I would like to keep the time between cessation of exercise and neuromuscular function test to be the same between the legs."
How do you plan to do that? You can't test both legs at the exact same time. (Maybe you could, but it wouldn't be easy, and it would probably affect your results.) One leg has to be tested before the other. I suppose you could alternate back and forth as to which leg is tested first during a break from the fatiguing task.
Hello Gordon L Warren,
The exercise will consist of repeated all-out cycling. Following the cessation of each bout, they will transition on to a dynamometer for the neuromuscular function test.
Perhaps I should just alternate between the legs as you suggested. Just brainstorming what my options are and whether the contralateral legs could be tested at the same time.
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