التفاصيل البيبلوغرافية
| العنوان: |
Changes in motor unit behaviour across repeated bouts of eccentric exercise. |
| المؤلفون: |
Hayman, Oliver1,2 (AUTHOR), Ansdell, Paul1 (AUTHOR), Angius, Luca1 (AUTHOR), Thomas, Kevin1 (AUTHOR), Horsbrough, Lauren1 (AUTHOR), Howatson, Glyn1,3 (AUTHOR), Kidgell, Dawson J.4 (AUTHOR), Škarabot, Jakob5 (AUTHOR), Goodall, Stuart1,6 (AUTHOR) stuart.goodall@northumbria.ac.uk |
| المصدر: |
Experimental Physiology. Nov2024, Vol. 109 Issue 11, p1896-1908. 13p. |
| مصطلحات موضوعية: |
*MOTOR unit, *ELECTROMYOGRAPHY, *DORSIFLEXION, *TORQUE |
| مستخلص: |
Unaccustomed eccentric exercise (EE) is protective against muscle damage following a subsequent bout of similar exercise. One hypothesis suggests the existence of an alteration in motor unit (MU) behaviour during the second bout, which might contribute to the adaptive response. Accordingly, the present study investigated MU changes during repeated bouts of EE. During two bouts of exercise where maximal lengthening dorsiflexion (10 repetitions × 10 sets) was performed 3 weeks apart, maximal voluntary isometric torque (MVIC) and MU behaviour (quantified using high‐density electromyography; HDsEMG) were measured at baseline, during (after set 5), and post‐EE. The HDsEMG signals were decomposed into individual MU discharge timings, and a subset were tracked across each time point. MVIC was reduced similarly in both bouts post‐EE (Δ27 vs. 23%, P = 0.144), with a comparable amount of total work performed (∼1,300 J; P = 0.905). In total, 1,754 MUs were identified and the decline in MVIC was accompanied by a stepwise increase in discharge rate (∼13%; P < 0.001). A decrease in relative recruitment was found immediately after EE in Bout 1 versus baseline (∼16%; P < 0.01), along with reductions in derecruitment thresholds immediately after EE in Bout 2. The coefficient of variation of inter‐spike intervals was lower in Bout 2 (∼15%; P < 0.001). Our data provide new information regarding a change in MU behaviour during the performance of a repeated bout of EE. Importantly, such changes in MU behaviour might contribute, at least in part, to the repeated bout phenomenon. What is the central question of this study?Is motor unit (MU) behaviour altered during the performance of an initial and repeated bout of eccentric exercise (EE)?What is the main finding and its importance?During the repeated bout of exercise, we observed a greater contribution from lower threshold MUs to force generation along with reduced firing rate variability. Results suggest an adaptation occurs during the performance of an initial bout of exercise and contributes to the accelerated recovery that occurs following the performance of a repeated bout of EE. Importantly, our data suggest that changes in MU behaviour contribute, partly, to the repeated bout phenomenon immediately upon performing a repeated bout of eccentric activity. [ABSTRACT FROM AUTHOR] |
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