Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial
The kinetics of recovery from neuromuscular fatigue resulting from exercise time trials (TTs) of different durations are not well-known. The aim of this study was to determine if TTs of three different durations would result in different short-term recovery in maximal voluntary contraction (MVC) and...
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Frontiers Media S.A.
2020-05-01
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| Series: | Frontiers in Physiology |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fphys.2020.00399/full |
| _version_ | 1818240322204860416 |
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| author | Christian Froyd Christian Froyd Fernando G. Beltrami Guillaume Y. Millet Brian R. MacIntosh Timothy D. Noakes |
| author_facet | Christian Froyd Christian Froyd Fernando G. Beltrami Guillaume Y. Millet Brian R. MacIntosh Timothy D. Noakes |
| author_sort | Christian Froyd |
| collection | DOAJ |
| description | The kinetics of recovery from neuromuscular fatigue resulting from exercise time trials (TTs) of different durations are not well-known. The aim of this study was to determine if TTs of three different durations would result in different short-term recovery in maximal voluntary contraction (MVC) and evoked peak forces. Twelve trained subjects performed repetitive concentric right knee extensions on an isokinetic dynamometer self-paced to last 3, 10, and 40 min (TTs). Neuromuscular function was assessed immediately (<2 s) and 1, 2, 4, and 8 min after completion of each TT using MVCs and electrical stimulation. Electrical stimulations consisted of single stimulus (SS), paired stimuli at 10 Hz (PS10), and paired stimuli at 100 Hz (PS100). Electrically evoked forces including the ratio of low- to high-frequency doublets were similar between trials at exercise cessation but subsequently increased more (P < 0.05) after the 3 min TT compared with either the 10 or 40 min TT when measured at 1 or 2 min of recovery. MVC force was not different between trials. The results demonstrate that recovery of peripheral fatigue including low-frequency fatigue depends on the duration and intensity of the preceding self-paced exercise. These differences in recovery probably indicate differences in the mechanisms of fatigue for these different TTs. Because recovery is faster after a 3 min TT than a 40 min TT, delayed assessment of fatigue will detect a difference in peripheral fatigue between trials that was not present at exercise cessation. |
| first_indexed | 2024-12-12T13:11:36Z |
| format | Article |
| id | doaj.art-0d8a131f2bcc481c90840b40c1bf93d3 |
| institution | Directory Open Access Journal |
| issn | 1664-042X |
| language | English |
| last_indexed | 2024-12-12T13:11:36Z |
| publishDate | 2020-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physiology |
| spelling | doaj.art-0d8a131f2bcc481c90840b40c1bf93d32022-12-22T00:23:31ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2020-05-011110.3389/fphys.2020.00399525289Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time TrialChristian Froyd0Christian Froyd1Fernando G. Beltrami2Guillaume Y. Millet3Brian R. MacIntosh4Timothy D. Noakes5Faculty of Education, Arts and Sport, Western Norway University of Applied Sciences, Bergen, NorwayDivision of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South AfricaExercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Zurich, SwitzerlandLaboratoire Interuniversitaire de Biologie de la Motricité, University of Lyon, UJM Saint-Etienne, Saint Etienne, FranceHuman Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, CanadaDivision of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South AfricaThe kinetics of recovery from neuromuscular fatigue resulting from exercise time trials (TTs) of different durations are not well-known. The aim of this study was to determine if TTs of three different durations would result in different short-term recovery in maximal voluntary contraction (MVC) and evoked peak forces. Twelve trained subjects performed repetitive concentric right knee extensions on an isokinetic dynamometer self-paced to last 3, 10, and 40 min (TTs). Neuromuscular function was assessed immediately (<2 s) and 1, 2, 4, and 8 min after completion of each TT using MVCs and electrical stimulation. Electrical stimulations consisted of single stimulus (SS), paired stimuli at 10 Hz (PS10), and paired stimuli at 100 Hz (PS100). Electrically evoked forces including the ratio of low- to high-frequency doublets were similar between trials at exercise cessation but subsequently increased more (P < 0.05) after the 3 min TT compared with either the 10 or 40 min TT when measured at 1 or 2 min of recovery. MVC force was not different between trials. The results demonstrate that recovery of peripheral fatigue including low-frequency fatigue depends on the duration and intensity of the preceding self-paced exercise. These differences in recovery probably indicate differences in the mechanisms of fatigue for these different TTs. Because recovery is faster after a 3 min TT than a 40 min TT, delayed assessment of fatigue will detect a difference in peripheral fatigue between trials that was not present at exercise cessation.https://www.frontiersin.org/article/10.3389/fphys.2020.00399/fullperipheral fatiguerecoverymaximal voluntary contractionfemoral nerve electrical stimulationmotor unit recruitmentelectromyography |
| spellingShingle | Christian Froyd Christian Froyd Fernando G. Beltrami Guillaume Y. Millet Brian R. MacIntosh Timothy D. Noakes Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial Frontiers in Physiology peripheral fatigue recovery maximal voluntary contraction femoral nerve electrical stimulation motor unit recruitment electromyography |
| title | Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial |
| title_full | Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial |
| title_fullStr | Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial |
| title_full_unstemmed | Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial |
| title_short | Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial |
| title_sort | greater short time recovery of peripheral fatigue after short compared with long duration time trial |
| topic | peripheral fatigue recovery maximal voluntary contraction femoral nerve electrical stimulation motor unit recruitment electromyography |
| url | https://www.frontiersin.org/article/10.3389/fphys.2020.00399/full |
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