Hi everybody. I always assumed that a higher activation of a specific muscle in an exercise (e.g. Gastrocnemius and Soleus activation during seated calf raises) would lead to greater adaptations of that muscle. However, I've never really read anything about it. Anyone have any references to recommend? Kind regards. Diulian.
Hi Diulian,
Thank you for your good question. First of all, I would like to mention that to achieve maximum effectiveness, we must consider factors involved in the adaptation of muscle to stress. These factors include overload, specificity, reversibility, VO2max, Running Economy and individual differences. In addition, There is increasing evidence for strong genetic influence in achieve maximum adaptation like ACTIN3 gene, MCT1 gene, AMPD gene ACE gene and NRF2 gene.
Herewith you will find some links related to my answer:
http://jenb.or.kr/xml/05289/05289.pdf https://www.revespcardiol.org/index.php?p=revista&tipo=pdf-simple&pii=13154108 http://www.scielo.br/pdf/rbme/v13n3/en_v13n3a16.pdf https://fjfsdata01prod.blob.core.windows.net/articles/files/302756/pubmed-zip/.versions/1/.package-entries/fphys-08-00993/fphys-08-00993.pdf?sv=2015-12-11&sr=b&sig=gPhZ8k8Jxe6ag%2BtBE9uhCUWnrLTLwCiaYQce5q3Sp%2BY%3D&se=2019-08-06T00%3A59%3A22Z&sp=r&rscd=attachment%3B%20filename%2A%3DUTF-8%27%27fphys-08-00993.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3938186/pdf/nihms555235.pdf https://www.karger.com/Article/Abstract/445239
Hi Diulian,
What do you mean with "activation"? How did you assessed it?
For example:
RMS-EMG: a training adaptation generally is obtained when, for the same load, let's say 10kg, your muscles are "less" activated than pre-training (expressed as 100% of RMS-EMG signal obtained during an MVC). This is generally accepted. Consider that EMG has several limitations that any practitioner must know (see Article Consensus for Experimental Design in Electromyography (CEDE)...
).Interpolated twitch technique: in this case muscle activation should not be used as index to rely in order to infer about chronic adaptations to training (there is an interesting point and counterpoint about that, just google "THE INTERPOLATED TWITCH DOES NOT PROVIDE A VALID MEASURE OF THE VOLUNTARY ACTIVATION OF MUSCLE").
I hope this can help,
GIorgio Varesco
Yes, they do, different training protocols even influence Fiber-Type-Composition, thats why no 100m-race specialist will ever win a marathon and vice-versa.
Mainly oxidatively operating "red" fibers, work at 5 Hz, giving them diastolic perfusion and easier new O2-supply, while "white" operate on 30 Hz just releasing lactate when short, but massive workload was released.
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