Vertical jump coordination: fatigue effects

Rodacki, André Luíz Félix; Fowler, Neil; Bennett, Simon J.

doi:10.1097/00005768-200201000-00017

Cited by 192 publications

(171 citation statements)

References 30 publications

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“…Fatigue may be produced metabolically, or muscularly, which leads to a decline in performance. A change in coordination (neural input), a change in the muscles' functional ability to produce force, or a combination of the two may be the cause of the decline in performance (Rodacki, Fowler, & Bennett, 2002). It has been shown that heavy resistance loading led to decreases in maximal neural activation and decreased explosive force production of the exercised muscles (Hakkinen, 1993), thus affecting performance.…”

Section: Fatiguementioning

confidence: 99%

“…Further, muscle fatigue leads to contractile force loss and muscle activation timing disturbance, which may then affect joint instability as was well as biomechanical alterations of the task (Vila-Cha, Carvalho, Machado, Conceicao, & Vilas Boas, 2005). As such, researchers have sought to determine the effects of fatigue on various jump-related tasks, such as landing from a jump (Pappas et al, 2007;Smith, Sizer, & James, 2009), performing a drop jump (Moran et al, 2009), performing a maximal vertical jump (Rodacki et al, 2002), and single-leg hop testing (Augustsson et al, 2006). Results have provided useful information on training programs to offset the effects of fatigue and improve landing technique, drop jump training, jump height performance, and functional performance when fatigued, all of which are especially important at the end of sporting events when fatigue is greater and injuries are more likely to occur (Dugan & Frontera, 2000).…”

Section: Fatiguementioning

confidence: 99%

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Effects of Fatigue on Bilateral Ground Reaction Force Asymmetries during the Squat Exercise

Hodges

Patrick

Reiser

2011

Journal of Strength and Conditioning Research

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OF THESIS EFFECTS OF FATIGUE ON BILATERAL GROUND REACTION FORCE ASYMMETRIES DURING THE SQUAT EXERCISEPhysical performance and risk for injury have been related to functional asymmetries of the lower extremity. The squat exercise is an important, functional movement serving as the major multi-joint, closed-chain lower extremity exercise in many strength and conditioning programs, as well as a large component in rehabilitation.Examinations of asymmetries during the squat exercise have revealed bilateral differences in the net joint torques, indicating unequal actions between the lower extremities. To date, no study has examined how fatigue affects these asymmetries. PURPOSE:The goal of this investigation was to examine functional bilateral asymmetries of the lower extremities during the squat exercise, exploring how they may change during the course of an individual set, as well as across multiple sets with fatigue.Based on a review of literature related to the effects of fatigue on functional asymmetries, it was hypothesized that asymmetries would increase with fatigue. METHODS:Seventeen recreationally trained men (n=9) and women (n=8) (mean ± SD age: 22.3 ± 2.5 yrs; height 170 ± 9.3 cm; mass 73.4 ± 13.8 kg) performed five sets of eight repetitions with 90% of their predetermined eight-repetition maximum (8RM 113 ± 35 % of their body mass). Anthropometric measurements and vertical ground reaction force (GRFv) data were collected. GRFv asymmetries were calculated by subtracting the % load on the iv right foot from that of the left foot. Initially highly symmetric subjects (± 1.7%) were removed from the analyses. The first two (R1&2) and last two (R7&8) repetitions of each set were examined. Eight subjects were reassessed for repeatability measures. RESULTS:R7&8 took longer to complete than R1&2 within a single set (p<0.001), however this finding was not observed across sets (p=0.867). The average asymmetry level across all sets for the absolute average was 4.3 ± 2.5% and 3.6 ± 2.3% for R1&2 and R7&8, respectively. There was no difference in whole group analysis (n=17) for any of the GRFv asymmetry analyses. Initially symmetric subjects were removed for the following analyses. For absolute peak instantaneous forces, the average asymmetry level across all sets was 3.8 ± 2.3% and 3.2 ± 2.3% for R1&2 and R7&8, respectively. Within a set, based on absolute asymmetry, levels of asymmetry dropped from beginning to end of a set (p=0.044). Exploring general shifts towards the left or right leg revealed a significant difference in peak instantaneous asymmetry with subjects becoming more symmetric with fatigue during the course of a single set (p=0.042). Of those who placed more weight on their right side at the beginning of a set, based on average asymmetry, a significant movement towards symmetry was seen for repetitions within a single set (p=0.036). Anthropometrics (segment lengths and circumferences) were generally not highly correlated to the asymmetries. Anthropometric measures were highly repeatable (Cronbac...

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Section: Fatiguementioning

confidence: 99%

Section: Fatiguementioning

confidence: 99%

Effects of Fatigue on Bilateral Ground Reaction Force Asymmetries during the Squat Exercise

Hodges

Patrick

Reiser

2011

Journal of Strength and Conditioning Research

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“…El KT puede estimular mecanorreceptores cutáneos y mejorar la información de la señal del movimiento o la posición de las articulaciones, lo cual podría mejorar la coordinación (16). Así mismo se conoce que la ejecución del salto depende de la coordinación de las acciones segmentarias del cuerpo humano, que están determinadas por la interacción entre las fuerzas musculares y los momentos netos que tienen que generarse alrededor de las articulaciones para cumplir las exigencias mecánicas de la tarea (17).…”

Section: Discussionunclassified

Efecto del kinesiotaping con y sin tensión aplicado en cuadríceps sobre la capacidad de salto en deportistas

Anaya¹,

Díaz²

2015

Rev. Fac. Cienc. Salud UDES

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“…A hipótese inicial desse estudo era que o comportamento do processo de fadiga e as alterações EMG durante um protocolo intermitente de saltos verticais difeririam das respostas encontradas em protocolos contínuos (BOSCO et al,1986;STROJNIK;KOMI, 2000;RODACKI;FOWLER;BENNETT, 2002;HESPANHOL et al, 2007;MCCAULLEY et al, 2007) predominantes no estudo deste gesto desportivo. Entretanto, como a característica do protocolo é bem próxima ao realizado em uma partida de voleibol, era esperado que as atletas não atingissem um estado de exaustão, mesmo diante da grande quantidade de saltos totais executados.…”

Section: Discussionunclassified

“…A divergência entre respostas neuromusculares pode estar relacionada com o menor efeito nos componentes contráteis e elásticos que potencializam o desempenho quando o protocolo é intermitente, como já citado na literatura (HORITA et al, 2002). Nessa perspectiva, a maioria dos estudos consideram somente as perspectivas neuromusculares e bioenergéticas ao avaliar a causa e o processo de instalação de fadiga na ação do salto vertical, induzidos pelos efeitos de protocolos contínuos e exaustivos (Bosco et al, 1986;Horita et al, 1996;Strojnik;Komi, 2000;Rodacki;Fowler;Bennett, 2002;McCaulley et al, 2007), diferentes da situação real de jogo.…”

Section: Discussionunclassified

Respostas neuromusculares dos membros inferiores durante protocolo intermitente de saltos verticais em voleibolistas

Felicissimo

Dantas

Moura

et al. 2012

Motriz: rev. educ. fis.

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IntroduçãoNo âmbito das práticas esportivas, sobretudo no que diz respeito ao esporte de rendimento, é notável a importância dada ao aperfeiçoamento no condicionamento físico das equipes em virtude da grande competitividade existente. Sendo assim, o desenvolvimento de formas para avaliar o desempenho dos atletas em sua modalidade específica é fundamental para um bom desempenho do atleta e da equipe.O voleibol, no que se refere às características inerentes à sua prática, é considerado um esporte altamente dinâmico, de contexto intermitente, no qual as habilidades motoras desenvolvidas se interpolam entre ações ofensivas e defensivas, momentos de atividade muscular intensa com Motriz, Rio Claro, v.18 n.1, p.153-164, jan./mar. 2012 Artigo Original Participaram 13 voleibolistas do sexo feminino (15,6 ± 0,9 anos). Inicialmente foi realizado um protocolo de potência máxima (três saltos máximos), seguido do protocolo de resistência de saltos (ciclos de três saltos máximos em aproximadamente 10 segundos (s) -um salto a cada três s, com recuperação de 15 s). O tempo de duração do protocolo de resistência foi de 20 minutos. Foi usada a técnica do salto com contramovimento sem ajuda dos braços, sobre tapete de contato. Para tratamento dos dados os saltos foram divididos em quatro períodos com 12 ciclos cada um. Os resultados mostraram queda na altura dos saltos de aproximadamente 1,3cm entre os períodos de 1 a 4, sendo que, essa queda foi mais significativa nos 3º e 4º períodos em comparação ao 1º e 2º. Entretanto, com relação às variáveis RMS e FM, não ocorreu alteração nas respostas eletromiográficas entre músculos e períodos. Concluiu-se, assim, que a fadiga pode depender de variáveis psicofisiológicas, ao nível do SNC, que também influem no desempenho. Palavras-chave: Voleibol. Eletromiografia. Desempenho esportivo. Tolerância ao exercício. Membros Inferiores. Respostas neuromusculares dos membros inferiores durante protocolo intermitente de saltos verticais em voleibolistas Neuromuscular responses of the lower limb muscles during vertical jumping in volleyball athletesAbstract: The purpose of this study was to analyze the performance and the electromyographic responses of the muscles Rectus Femoris, Biceps Femoris and Gastrocnemius Medialis during vertical jumping protocol. Participated 13 female volleyball players (15,6 ± 0,9 years). Initially was performed a protocol of maximum power (three maximum jumps), followed by resistance jumps protocol (cycles of three maximum jumps in about 10 seconds (s) -one jump every three s, with recovery of 15s. The duration of resistance protocol was 20 minutes. Technique used was countermovement jump without the aid of arms on a mat of contact. The data collected during the jumps were divided into four periods containing 12 cycles each. The results showed a decrease in the height of the jumps of about 1,3cm between the periods from 1 to 4, and this decrease was more significant in the 3 rd and 4 th periods compared with the 1 st and 2 nd . However, with respect to the variables R...

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Vertical jump coordination: fatigue effects

Abstract: It was suggested that the neural input used in the fatigued condition did not constitute an optimal solution and may have played a role in decreasing maximal jump height achievement.

Cited by 192 publications

References 30 publications

Effects of Fatigue on Bilateral Ground Reaction Force Asymmetries during the Squat Exercise

Effects of Fatigue on Bilateral Ground Reaction Force Asymmetries during the Squat Exercise

Efecto del kinesiotaping con y sin tensión aplicado en cuadríceps sobre la capacidad de salto en deportistas

Respostas neuromusculares dos membros inferiores durante protocolo intermitente de saltos verticais em voleibolistas

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