Muscle coordination changes during intermittent cycling sprints

Billaut, François; Basset, Fabien A.; Falgairette, G.

doi:10.1016/j.neulet.2005.01.048

Cited by 66 publications

(67 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance, several studies have reported alternating levels of muscle activity among synergist muscles during low-level submaximal isometric exercises (Kouzaki and Shinohara, 2006;Kouzaki et al, 2002). Other authors reported changes in muscle coordination during a dynamic task such as pedaling (Billaut et al, 2005;Dorel et al, 2009), hopping (Bonnard et al, 1994) or vertical jump (Rodacki et al, 2002). Although some of these studies reported modest changes (Dorel et al, 2009;Rodacki et al, 2002), others reported more important changes in both muscle activity level and muscle activity profile (Bonnard et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Fatigue-related adaptations in muscle coordination during a cyclic exercise in humans

Turpin

Guével

Durand

et al. 2011

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYMuscle fatigue is an exercise-induced reduction in the capability of a muscle to generate force. A possible strategy to counteract the effects of fatigue is to modify muscle coordination. We designed this study to quantify the effect of fatigue on muscle coordination during a cyclic exercise involving numerous muscles. Nine human subjects were tested during a constant-load rowing exercise (mean power output: 217.9±32.4W) performed until task failure. The forces exerted at the handle and the footstretcher were measured continuously and were synchronized with surface electromyographic (EMG) signals measured in 23 muscles. In addition to a classical analysis of individual EMG data (EMG profile and EMG activity level), a non-negative matrix factorization algorithm was used to identify the muscle synergies at the start and the end of the test. Among the 23 muscles tested, 16 showed no change in their mean activity level across the rowing cycle, five (biceps femoris, gluteus maximus, semitendinosus, trapezius medius and vastus medialis) showed a significant increase and two (gastrocnemius lateralis and longissimus) showed a significant decrease. We found no change in the number of synergies during the fatiguing test, i.e. three synergies accounted for more than 90% of variance accounted for at the start (92.4±1.5%) and at the end (91.0±1.8%) of the exercise. Very slight modifications at the level of individual EMG profiles, synergy activation coefficients and muscle synergy vectors were observed. These results suggest that fatigue during a cyclic task preferentially induces an adaptation in muscle activity level rather than changes in the modular organization of the muscle coordination.

show abstract

Section: Introductionmentioning

confidence: 99%

Fatigue-related adaptations in muscle coordination during a cyclic exercise in humans

Turpin

Guével

Durand

et al. 2011

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…Importantly, such a reduction in agonist muscle recruitment during repeated cycle sprints has been strongly correlated (r = 0.91 to 0.98, P < 0.05, Figure 4) with the decline in mechanical output (Billaut and Smith 2009;Mendez-Villanueva et al 2008). That being said, it is interesting to note that when fatigue is moderate (e.g., fatigue index or sprint decrement score is ~10% or lower), studies have typically reported a steady level of muscle recruitment during repeated-sprint exercise (Billaut and Basset 2007;Billaut et al 2005;Girard et al 2008;Hautier et al 2000;Matsuura et al 2007). However, when the neuromuscular fatigue level is more substantial (> 20%), a concurrent decline in mechanical performance and the amplitude of EMG signals has consistently been reported across sprint repetitions (Billaut et al 2011;Mendez-Villanueva et al 2007Racinais et al 2007;Smith and Billaut 2010).…”

Section: Electromyographic Events During Repeated-sprint Exercise 41mentioning

confidence: 92%

“…The biceps femoris muscle was activated earlier within a pedaling cycle presumably to account for the loss of force of the prime movers in order to maintain the transfer of force to the pedal. Importantly, this locomotor alteration occurred before any changes in the "quantity" of muscle recruitment (i.e., EMG amplitude), which suggests that muscle activation sequence is an important parameter in the regulation of exercise intensity (Billaut et al 2005). Admittedly, much work lies ahead to substantiate this hypothesis and fully comprehend the neural processes behind the complex regulation of muscle actions.…”

Section: Timing Of Muscle Activationmentioning

confidence: 98%

“…However, whether the central projection of afferent feedbacks from fatigued muscles changes according to the continuous vs. intermittent nature of the exercise task remains unknown. It is intuitive that the dramatic metabolic disturbances that occur within the exercising muscle during "all-out" and repeated sprints (for review see (Billaut and Bishop 2009)) influence the central projection of these feedbacks and thus affect the central neural drive during such intense tasks (Billaut et al 2005;MendezVillanueva et al 2008;Racinais et al 2007). That being said, the manipulation of intramuscular pH, for example, by oral administration of sodium bicarbonate does not influence EMG activity and mechanical performance during repeated cycling sprints (Matsuura et al 2007).…”

Section: At Least Two Potential Causes For Down-regulation Of Muscle mentioning

confidence: 99%

See 1 more Smart Citation

Electromyography Assessment of Muscle Recruitment Strategies During High-Intensity Exercise

Billaut¹

2011

Advances in Applied Electromyography

View full text Add to dashboard Cite

“…Ao avaliar o comportamento da potência máxima e da ativação elétrica dos músculos VL e BF de 12 ciclistas, durante dez sprints, com seis segundos de duração, Billaut et al (52) observaram queda de aproximadamente 11% no valor de pico da potência máxima (primeiro vs. 10º sprint); no entanto, não houve diferença na integral do sinal eletromiográfico (iEMG).…”

Section: Fadiga Neuromuscular No Ciclismounclassified

Aspectos relacionados à fadiga durante o ciclismo: uma abordagem biomecânica

Diefenthaeler

Vaz

2008

Rev Bras Med Esporte

View full text Add to dashboard Cite

INTRODUÇÃOO ciclismo é considerado um esporte complexo. As competições são divididas em provas de pista (velódromo) e provas de rua (estrada), individualmente ou por equipes (1,2) . As provas de estrada apresentam características distintas em relação à duração, intensidade e topografia. Entre elas podemos destacar o Tour de France, com um percurso de aproximadamente 3.000km, percorridos durante 21 dias ininterruptos, entre os mais variados tipos de terrenos (3) . As competições de estrada têm como característica a manutenção de alta intensidade por tempo prolongado, o que resulta na instauração do processo de fadiga, principalmente em função das mudanças na produção de torques resultantes das contrações musculares e na atividade elétrica dos músculos dos membros inferiores (2,(4)(5)(6) . A fadiga muscular pode ser definida como um conjunto de alterações decorrentes do trabalho ou exercício prolongado, gerando RESUMOA fadiga muscular pode ser definida como a incapacidade funcional na manutenção de um nível esperado de força. As competições de ciclismo, especialmente provas de estrada, apresentam como caracterís-tica longa duração e altas intensidades. Tais características resultam na instauração do processo de fadiga, que pode estar associado a mecanismos e fatores metabólicos que afetam os músculos (fadiga periférica) e o sistema nervoso central (fadiga central). O objetivo deste trabalho é fazer uma revisão sobre aspectos relacionados com as mudanças na técnica de pedalada e na atividade elétrica dos músculos envolvidos nesse movimento durante o processo de fadiga. Alguns desses aspectos têm sido reportados na literatura e podem ter repercussão na (1) magnitude, direção e sentido de aplicação das forças no pedal; no (2) padrão de ativação muscular; na (3) geração de força e, conseqüentemente, no (4) desempenho do ciclista. No entanto, poucos estudos associam a fadiga muscular ao comportamento das forças aplicadas no pedal e ao padrão da ativação muscular. Os resultados dos estudos revisados demonstram a incapacidade dos ciclistas em manter a força desejada, perda da técnica de pedalada e mudança nos padrões de ativação elétrica sob condições de fadiga.Palavras-chave: fadiga, biomecânica, desempenho, ciclismo. ABSTRACTMuscular fatigue can be defined as functional inability to maintain a desired force output. During cycling competition, especially road races, cyclists are required to exercise for extended duration at high intensities. These features often result in fatigue, which can be associated with metabolic mechanisms and factors affecting both muscles (peripheral fatigue) and the central nervous system (central fatigue). The aim of this study is to review aspects related to alterations in the pedaling technique and electrical activation of the muscles during a fatiguing exercise bout. Some of these alterations have been reported in the literature and can reflect on the (1) magnitude, direction, and sign of the forces applied on the pedal; (2) muscle activation pattern; (3) force generation; (4) and consequ...

show abstract

Muscle coordination changes during intermittent cycling sprints

Cited by 66 publications

References 19 publications

Fatigue-related adaptations in muscle coordination during a cyclic exercise in humans

Fatigue-related adaptations in muscle coordination during a cyclic exercise in humans

Electromyography Assessment of Muscle Recruitment Strategies During High-Intensity Exercise

Aspectos relacionados à fadiga durante o ciclismo: uma abordagem biomecânica

Contact Info

Product

Resources

About