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This study examined the effects of sustained, isometric forearm flexion tasks anchored to ratings of perceived exertion of 2 (RPE2) and 8 (RPE8) on the patterns of fatigue-induced changes in torque and neuromuscular responses, time to task failure (TTF), performance fatigability (% decline in maximal voluntary isometric contraction [MVIC]), and perceived factors that contributed to task termination. Twelve men (mean ± SD: age = 20.9 ± 2.2 yrs) performed MVICs before and after the tasks and completed post-test questionnaires (PTQ). Data were analyzed using polynomial regression analyses, dependent -tests, Spearman's rank order correlations, and Wilcoxon signed rank tests. The RPE8 had greater ( < 0.001) performance fatigability than the RPE2, despite no difference ( > 0.05) in TTF. During both tasks, there were significant ( ≤ 0.05) composite linear decreases for torque, electromyographic amplitude, and neuromuscular efficiency, and substantial individual variability in the neuromuscular responses. There were no significant ( > 0.05) associations among the perceived factors and TTF or performance fatigability. Thus, there were RPE-specific differences in performance fatigability, but not TTF or the composite patterns of changes in torque and neuromuscular responses. In addition, in most cases, the individual neuromuscular, but not torque, patterns of responses were RPE-specific. Furthermore, the perceived factors assessed by the PTQ were not related to TTF or performance fatigability.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11417799 | PMC |
http://dx.doi.org/10.3390/jfmk9030152 | DOI Listing |
BMJ Open
December 2024
School of Healthcare Sciences, Cardiff University, Cardiff, UK.
Objective: Long COVID encompasses a range of symptoms in which fatigue is one of the most prevalents. It is clear from other conditions that the definition and measurement of fatigue can be complex, but it is not clear how fatigue is defined and measured in long COVID. To advance our understanding, this review summarises the definitions and measures of long COVID fatigue being used by researchers.
View Article and Find Full Text PDFJ Electromyogr Kinesiol
November 2024
Hungarian University of Sports Science, Department of Kinesiology, Budapest, Hungary; University of Groningen, Groningen, University Medical Center Groningen (UMCG), Department of Human Movement Science, Groningen, The Netherlands; Department of Sport Biology, Institute of Sport Sciences and Physical Education, University of Pécs, Pécs, Hungary.
Mental fatigue can affect cognitive function and interfere with motor performance. We examined if mental fatigue affected gait through age-specific modulation of wavelet-based time-frequency intermuscular beta-band coherence in muscles while walking on a treadmill at 1.2 m·s-1.
View Article and Find Full Text PDFBMJ Open
November 2024
Université Jean Monnet Saint-Etienne, Lyon 1, Université Savoie Mont-Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, F-42023, SAINT-ETIENNE, France
Introduction: Cerebral palsy (CP) presents a complex neurodevelopmental disorder with a spectrum of motor impairments stemming from early brain injury. Whereas CP is traditionally viewed as a non-progressive condition, emerging evidence suggests a progressive decline in mobility and function, particularly in adulthood. Despite the prevalence of self-reported age-related gait decline in adults with CP, objective evidence supporting this phenomenon remains limited.
View Article and Find Full Text PDFEur J Appl Physiol
November 2024
INSERM UMR1093-CAPS, Université de Bourgogne, UFR Des Sciences du Sport, UFR STAPS, Campus Universitaire, BP 27877, F-21000, Dijon, France.
Purpose: Neuromuscular fatigability is task-dependent, but the influence of the contraction pattern on neuromuscular fatigability is largely unknown. Therefore, the present study aims to investigate if neuromuscular fatigability is affected by the contraction pattern of exhausting isometric exercises.
Methods: Thirteen participants sustained a plantar flexors MVC for 1 min (MVC) before and after exhausting exercises designed to produce a similar mean torque (30% MVC), and following a 10-min rest period.
J Biomech
December 2024
Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA. Electronic address:
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