دورية أكاديمية
Are performance and perceived fatigability dependent on the anchor scheme of fatiguing isometric tasks in men?
| العنوان: | Are performance and perceived fatigability dependent on the anchor scheme of fatiguing isometric tasks in men? |
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| المؤلفون: | Ortega DG; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA - dortega6@huskers.unl.edu., Smith RW; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA., Arnett JE; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA., Neltner TJ; Department of Health and Human Performance, University of Wisconsin - Platteville, Platteville, WI, USA., Schmidt RJ; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA., Johnson GO; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA., Housh TJ; Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska - Lincoln, Lincoln, NE, USA. |
| المصدر: | The Journal of sports medicine and physical fitness [J Sports Med Phys Fitness] 2024 Jun; Vol. 64 (6), pp. 505-515. Date of Electronic Publication: 2024 Mar 04. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Edizioni Minerva Medica Country of Publication: Italy NLM ID: 0376337 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1827-1928 (Electronic) Linking ISSN: 00224707 NLM ISO Abbreviation: J Sports Med Phys Fitness Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Torino : Edizioni Minerva Medica |
| مواضيع طبية MeSH: | Muscle Fatigue*/physiology , Isometric Contraction*/physiology , Electromyography* , Physical Exertion*/physiology, Humans ; Male ; Young Adult ; Torque ; Forearm/physiology ; Perception/physiology ; Adult ; Muscle, Skeletal/physiology |
| مستخلص: | Background: Ratings of perceived exertion (RPE) can be used to regulate exercise intensity. This study examined the effect of anchor scheme on performance fatigability and neuromuscular responses following fatiguing forearm flexion tasks. Methods: Twelve men (age 20.9±2.2 years; height 179.8±5.3 cm; body mass 80.2±9.9 kg) performed sustained, isometric forearm flexion tasks to failure anchored to RPE=6 (RPEFT) and the torque (TRQFT) that corresponded to RPE=6. Pre-test and post-test maximal voluntary isometric contractions (MVIC) were performed to quantify changes in the amplitude (AMP) and mean power frequency (MPF) of the electromyographic (EMG) and mechanomyographic (MMG) signals. Neuromuscular efficiency (NME) was calculated by dividing normalized torque by normalized EMG AMP. A dependent t-test was used to assess the mean difference for time to task failure (TTF). Repeated measures ANOVAs were used to compare mean differences for performance fatigability and normalized neuromuscular parameters. Results: The RPEFT had a greater TTF than the TRQFT (P<0.001). MVIC and NME decreased from pre-test to post-test following the RPEFT and TRQFT (P<0.05) with no differences between anchor schemes. Following the TRQFT, normalized EMG MPF decreased from pre-test to post-test (P=0.004). Following the RPEFT, normalized MMG MPF increased from pre-test to post-test (P=0.021). There were no changes in normalized EMG AMP or MMG AMP (P>0.05). Conclusions: These findings indicated anchor scheme-specific neuromuscular responses and TTF, despite no difference in performance fatigability. Furthermore, performance fatigability was likely due to peripheral fatigue (based on normalized EMG MPF and NME) following the TRQFT, but peripheral and central fatigue (based on normalized MMG MPF and NME) following the RPEFT. |
| تواريخ الأحداث: | Date Created: 20240304 Date Completed: 20240523 Latest Revision: 20240523 |
| رمز التحديث: | 20240523 |
| DOI: | 10.23736/S0022-4707.24.15721-0 |
| PMID: | 38436595 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1827-1928 |
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| DOI: | 10.23736/S0022-4707.24.15721-0 |