Physiological Responses to Shuttle Repeated-Sprint Running

Abstract

This study investigated the influence of 180 degrees changes of direction during a repeated-sprint running test on performance, cardiorespiratory variables, muscle deoxygenation and post-exercise blood lactate ([La] (b)) levels. Thirteen team-sport athletes (22+/-3 yr) performed 6 repeated maximal sprints with (RSS, 6 x[2 x 12.5 m]) or without (RS, 6 x 25 m) changes of direction. Best and mean running time, percentage speed decrement (%Dec), pulmonary oxygen uptake ( V O (2)), vastus lateralis deoxygenation (Hb (diff)) and [La] (b) were calculated for each condition. Best and mean times for both protocols were largely correlated (r =0.63 and r =0.78, respectively), and were 'ALMOST CERTAINLY' higher for RSS compared with RS (e. g., 5.30+/-0.17 vs. 4.09+/-0.17 s for mean time, with the qualitative analysis revealing a 100% chance of RSS time being greater than RS). In contrast, %Dec was 'POSSIBLY' lower for RSS (2.6+/-1.2 vs. 3.2+/-1.3%, with a 79% chance of a real difference). Compared with RS, V O (2) (40.4+/-4.2 vs. 38.9+/-3.8 mL x min (-1) x kg (-1), with a 90% chance of a real difference) and [La] (b) (10.0+/-1.7 vs. 9.3+/-2.4 mmol.L (-1), with a 70% chance of a real difference) were 'POSSIBLY' higher. Conversely, there were no differences in Hb (diff) (11.5+/-3.2 vs. 10.9+/-3.0 microM, with the comparison rated as 'UNCLEAR'). To conclude, the present results suggest that the ability to repeat sprints can be considered as a general quality. They also suggest that repeated shuttle sprints might be an effective training practice for eliciting a greater systemic physiological load, but perhaps not a greater loading of the vastus lateralis.

NIRS Measurements with Elite Speed Skaters: Comparison Between the Ice Rink and the Laboratory

“…It houses three pairs of light emitting diodes (LEDs) which emit light of wavelengths 760 and 850nm, and are positioned 30mm, 35mm, and 40mm from the detector. This device has previously been used to investigate muscle oxygenation and hemodynamics in both a controlled laboratory environment [9], and in a field setting: thus utilizing the portable, wireless nature of the instrument [10][11][12]. The devices were positioned on the belly of the vastus lateralis muscle, midway between the greater trochanter of the femur and the lateral epicondyle.…”

The physiological responses to repeated upper-body sprint exercise in highly trained athletes

“…Although NIRS has recently been used to study repetitive work during running (Buchheit et al 2010;Ihsan et al 2013;Jones et al 2013;Ufland et al 2013) and cycling (Billaut and Buchheit 2013;Racinais et al 2007;Billaut 2010, 2012), this is the first study employing NIRS to determine physiological responses in the working muscles during upper-body repeated sprints. Moreover, it is the first study where the responses to repeated sprints are simultaneously measured in multiple muscles varying from highly active to supposedly inactive contributors.…”

Relação entre aptidão aeróbia e capacidade de sprints repetidos no futebol: efeito do protocolo. DOI: 10.5007/1980-0037.2011v13n2p111

“…Tomlin Tendo em vista que exercícios com mudança de sentido exigem uma frenagem, seguida de uma aceleração, verifica-se que a força e a resistência muscular dos membros inferiores também são passíveis de serem aumentadas neste modelo de esforço. Assim, em comparação com protocolos que utilizam corrida em linha reta, os exercícios com mudança de sentido poderiam apresentar uma demanda aeróbia maior dos membros inferiores 13,14 . Desta forma, parece existir uma lacuna na literatura sobre a relação de indicadores anaeróbios com variáveis aeróbias determinados em diferentes modelos de corrida (contínua em linha reta vs intermitente com mudança de sentido).Tais achados poderão contribuir para o delineamento dos modelos de treino que visam combinar treinamento aeróbio e CSR para atletas de futebol.…”