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| Content Provider | Springer Nature Link |
|---|---|
| Author | Leterme, Damien Casasvas, Béatrice |
| Copyright Year | 1999 |
| Abstract | Contractile and fatigue-resistance properties of 71 lateral gastrocnemius muscle (LG) motor units (MU) following 14 days of hindlimb unloading (HU) were compared to those of 60 LG MU from control rats. The MU properties were assessed from isolated and stimulated individual motor axons. The MU were classified using standard criteria (shape of unfused tetani and fatigue resistance). The HU did not affect LG MU composition, but diminished the maximal tetanic tension (P 0) of all MU types: P 0 was significantly reduced by about 40% for the slow and fast-resistant MU, and by 18% for the fast-fatigable ones. The speed-related properties of fast-resistant MU became more similar to those of slower MU. The fatigue properties of MU were evaluated during a 5-min exercise test, using two fatigue indexes, FI2 and FI5, which expressed the relative capacity of MU to generate tension after 2 and 5 min, respectively. Results showed that 14 days of HU did not change the fatigue sensitivity of the LG MU. However, when FI5 was compared to FI2, a greater decrease was observed after HU than in control conditions for the fast-resistant and fast-intermediate MU. It was concluded that a prolonged fatigue test may show changes in metabolic properties of muscle fibres during 14 days of HU. Specific adaptations of LG MU as well as comparisons with those of the soleus muscle under the same conditions are discussed. |
| Starting Page | 312 |
| Ending Page | 317 |
| Page Count | 6 |
| File Format | |
| ISSN | 03015548 |
| Journal | European Journal of Applied Physiology |
| Volume Number | 79 |
| Issue Number | 4 |
| e-ISSN | 14396327 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 1999-04-08 |
| Publisher Place | Berlin/Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Public Health, Environmental and Occupational Health |
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