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The pH heterogeneity in human calf muscle during neuromuscular electrical stimulation.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stutzig, Norman Phil. Rzanny, Reinhard Moll, Kevin Gussew, Alexander Reichenbach, Jürgen R. Siebert, Tobias |
| Copyright Year | 2017 |
| Abstract | PURPOSE The aim of the study was to examine pH heterogeneity during fatigue induced by neuromuscular electrical stimulation (NMES) using phosphorus magnetic resonance spectroscopy (31 P-MRS). It is hypothesized that three pH components would occur in the 31 P-MRS during fatigue, representing three fiber types. METHODS The medial gastrocnemius of eight subjects was stimulated within a 3-Tesla whole body MRI scanner. The maximal force during stimulation (Fstim ) was examined by a pressure sensor. Phosphocreatine (PCr), adenosintriphosphate, inorganic phosphate (Pi), and the corresponding pH were estimated by a nonvolume-selective 31 P-MRS using a small loop coil at rest and during fatigue. RESULTS During fatigue, Fstim and PCr decreased to 27% and 33% of their initial levels, respectively. In all cases, the Pi peak increased when NMES was started and split into three different peaks. Based on the single Pi peaks during fatigue, an alkaline (6.76 ± 0.08), a medium (6.40 ± 0.06), and an acidic (6.09 ± 0.05) pH component were observed compared to the pH (7.02 ± 0.02) at rest. CONCLUSION It is suggested that NMES is able to induce pH heterogeneity in the medial gastrocnemius, and that the single Pi peaks represent the different muscle fiber types of the skeletal muscle. Magn Reson Med 77:2097-2106, 2017. © 2016 International Society for Magnetic Resonance in Medicine. |
| Starting Page | 2097 |
| Ending Page | 2106 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.ismrm.org/MRM/77_6_MRM.pdf |
| PubMed reference number | 27436629v1 |
| Alternate Webpage(s) | https://doi.org/10.1002/mrm.26329 |
| DOI | 10.1002/mrm.26329 |
| Journal | Magnetic resonance in medicine |
| Volume Number | 77 |
| Issue Number | 6 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Acids Coil Device Component Electric stimulation technique Fatigue Gastrocnemius muscle structure Intracranial Hypertension Magnetic Resonance Spectroscopy Mandibular right second molar tooth Muscle Fibers Neuromuscular Electrical Stimulation Phosphate measurement Phosphocreatine Phosphorus Polymerase Chain Reaction Scanner Device Component Structure of calf of leg Tissue fiber inorganic phosphate |
| Content Type | Text |
| Resource Type | Article |
