Role of feedback from Group III and IV muscle afferents in perception of effort, muscle pain, and discomfort

Marcora, Samuele Maria

doi:10.1152/japplphysiol.00146.2011

Cited by 11 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…TT vs. TTE) to choose. A fast start, as seen during most real-world TT efforts, will stimulate Type III/IV neurons [ 23 ], increase the level of pain [ 22 ] and thereby the overall exertion, which might result in a reduced PO. However, fluctuations in PO during TT more closely mimic real-world TT and therefore, TT should be preferred to construct the power-duration relationship.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

et al. 2017

View full text Add to dashboard Cite

The purpose of this study was to assess the reliability of critical power (CP) and the total amount of work accomplished above CP (W´) across repeated tests using ecologically valid maximal effort time-trials (TT) under laboratory conditions. After an initial incremental exercise test, ten well-trained male triathletes (age: 28.5 ± 4.7 years; body mass: 73.3 ± 7.9 kg; height: 1.80 ± 0.07 m; maximal aerobic power [MAP]: 329 ± 41 W) performed three testing sessions (Familiarization, Test I and Test II) each comprising three TT (12, 7, and 3 min with a passive recovery of 60 min between trials). CP and W´ were determined using a linear regression of power vs. the inverse of time (1/t) (P = W´ ∙ 1/t + CP). A repeated-measures ANOVA was used to detect differences in CP and W´ and reliability was assessed using the intra-class correlation coefficient (ICC) and the coefficient of variation (CoV). CP and W´ values were not significantly different between repeated tests (P = 0.171 and P = 0.078 for CP and W´, respectively). The ICC between Familiarization and Test I was r = 0.86 (CP) and r = 0.58 (W´) and between Tests I and II it was r = 0.94 (CP) and r = 0.95 (W´). The CoV notably decreased from 4.1% to 2.6% and from 25.3% to 8.2% for CP and W´, respectively. Despite the non-significant differences for both parameter estimates between Familiarization, Test I, and Test II, ICC and CoV values improved notably after the familiarization trial. Our novel findings indicate that for both, CP and W´ a familiarization trial increased reliability. It is therefore advisable to familiarize well-trained athletes when determining the power-duration relationship using TT under laboratory conditions.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Despite this finding, it is currently unclear, if CP derived from TTE represent a sustainable intensity. As a result of the constant power profile during TTE, as opposed to power fluctuations during TT, pain, discomfort and peripheral fatigue might be delayed [ 22 , 23 ], and therefore could increase mean PO.…”

Section: Introductionmentioning

confidence: 99%

Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Contudo, também tem sido sugerido que a PSE seja influenciada por alterações ocorridas na periferia do corpo. Utilizando informações aferentes providas pelo sistema nervoso periférico (Abbiss & Peiffer, 2010;Bishop, de Vrijer, & Mendez-Vilanueva, 2010;Gandevia, 2001;Marcora, 2011), regiões subcorticais e corticais do SNC seriam capazes de monitorar as alterações cardiopulmonares (VO 2 e FC), musculares (lactato, pH, potássio, etc. ), além de alterações na temperatura corporal, durante o exercício (Amann & Secher, 2010).…”

Section: Integração Entre Sistema Nervosounclassified

Percepção subjetiva de esforço como marcadora da duração tolerável de exercício

Pinheiro¹,

Viana²

2014

Motricidade

View full text Add to dashboard Cite

A percepção subjetiva de esforço (PSE) foi sugerida, originalmente, como uma marcadora da intensidade do exercício, pois ela responderia às alterações nos sistemas cardiopulmonar e metabólico, principalmente às alterações da FC e concentrações de lactato sanguíneo durante o exercício. Entretanto, esta interpretação não se alinha às respostas fisiológicas observadas em diferentes intensidades de exercícios, pois a PSE aumenta de forma linear, mesmo em intensidades em que ocorre um estado de equilíbrio fisiológico. No presente artigo de revisão, discutimos que este desalinhamento entre teoria e resultados experimentais poderáestar ligado aos mecanismos de geração e modulação da PSE durante o exercício. Neste caso, o mecanismo de geração da PSE pelo sistema nervoso central poderá responder basicamente à intensidade do exercício, enquanto as respostas fisiológicas periféricas poderão modular a PSE ao longo do exercício, indicando as condições fisiológicas quando da realização do exercício. Desta forma, a PSE poderia ser marcadora da duração tolerável do exercício executado numa determinada intensidade.

show abstract

“…It is interesting to note that these acute physiological responses did not align with perceptual ratings of pain and effort during exercise. Local muscle sensations of pain/discomfort were notably greater with continuous BFR, which may suggest a greater activation of group III/IV afferent fibres [207]. Activation of these groups of afferents are thought to be linked to intramuscular metabolite accumulation [140] and is known to regulate the cardiovascular response to exercise [309].…”

Section: Cardiovascular and Metabolic Responsesmentioning

confidence: 99%

“…Potentially related to the cardiovascular responses are the perceptions of pain and effort, and the systemic endocrine response to exercise. These are typically thought to be driven by activation of the same chemoreceptive reflex and group III/IV afferents pathways within muscle [207,256]. Evidence suggests that a continuous BFR protocol elicits greater perceived pain and effort during exercise compared with an intermittent protocol [95].…”

Section: Introductionmentioning

confidence: 99%

The physiological, morphological and functional responses to resistance exercise with blood flow restriction: an examination of protocol type and exercise load

Davids¹

View full text Add to dashboard Cite

Resistance training is performed by a wide range of populations, to achieve a diverse range of outcomes in skeletal muscle. Predominantly, such outcomes include the development and/or maintenance of skeletal muscle mass and strength but may also include muscular power or endurance. Blood flow restricted (BFR) resistance exercise is recognized as a novel strategy to achieve such outcomes in skeletal muscle, with much lower-loads (20-50% of one-repetition maximum) than those traditionally employed. The capacity to reduce external loading has made BFR exercise an attractive training modality for individuals who may not tolerate high levels of mechanical stress, such as frail older persons or clinical populations. Moreover, temporarily limiting training loads and/or volume has also generated interest in BFR exercise in athletic cohorts. Despite the promise held by this modality of exercise, there is large heterogeneity in the methods (e.g., BFR methodology and exercise prescription) adopted by practitioners, which often leads to variable training outcomes. Consequently, there is a need to understand each of the many variables that comprise the BFR exercise stimulus, such as those relating to the cuff application (e.g., pressure, restriction duration etc.) and the exercise prescribed (intensity/loading, volume etc). A review of the literature (Chapter Two) identified that one particular variable receiving little attention is whether blood flow must be restricted during the inter-set recovery periods (continuous BFR), or if this is only necessary during the working periods (intermittent BFR). A greater understanding of such variables will permit the configuration of optimal and evidence-based BFR protocols, meaning that this mode of exercise may be tailored to suit the goals and health considerations of a wide spectrum of individuals. As such, this thesis encompasses a series of independent, yet related studies that examine a wide range of acute and chronic responses to different low-load BFR resistance exercise protocols, with the ultimate aim of contributing towards the current evidencebased and best-practice guidelines for BFR exercise. Study One compared chronic training adaptations between continuous and intermittent BFR protocols. The lack of differences between protocols in several morphological and functional outcomes suggested that the additional metabolic stress imposed on skeletal muscle with a continuous BFR protocol may not be necessary. However, because the study involved untrained participants, the findings may not translate to well-trained and athletic cohorts. Study Two compared differences between continuous and intermittent BFR for a wide range of acute outcomes, including neuromuscular, cardiovascular, metabolic and University Library and, subject to the policy and procedures of The University of Queensland, the thesis be made available for research and study in accordance with the Copyright Act 1968 unless a period of embargo has been approved by the Dean of the Graduate School.

show abstract

Role of feedback from Group III and IV muscle afferents in perception of effort, muscle pain, and discomfort

Cited by 11 publications

References 8 publications

Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

Reliability of the parameters of the power-duration relationship using maximal effort time-trials under laboratory conditions

Percepção subjetiva de esforço como marcadora da duração tolerável de exercício

The physiological, morphological and functional responses to resistance exercise with blood flow restriction: an examination of protocol type and exercise load

Contact Info

Product

Resources

About