Acute effects of static stretching on peak and end-range hamstring-to-quadriceps functional ratios

Şekir, Ufuk; Arabacı, Ramiz; Akova, Bedrettin

doi:10.5312/wjo.v6.i9.719

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…15,19 This function is commonly assessed by calculating the functional ratio (flexor eccentric strength/extensor concentric strength) since it is thought to mimic muscular involvement during sport activities. 1,13,29 During knee extension (from 90° to 0° of knee flexion), this functional ratio increases from 0.48 to 1.30 in an uninjured population. 5,16 Throughout knee extension, our patients’ ratio increased in this range for both sides, regardless of the type of surgery.…”

Section: Discussionmentioning

confidence: 99%

Isokinetic Strength After ACL Reconstruction: Influence of Concomitant Anterolateral Ligament Reconstruction

et al. 2021

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Background: To reduce the rate of anterior cruciate ligament (ACL) graft rupture, recent surgeries have involved anterolateral ligament reconstruction (ALLR). This reconstruction procedure harvests more knee flexor muscle tendons than isolated ACL reconstruction (ACLR), but its influence on knee muscle strength recovery remains unknown. This study aimed to assess the influence of ALLR with a gracilis graft on the strength of the knee extensor and flexor muscles at 6 months postoperatively. Hypothesis: The additional amount of knee flexor harvest for ALLR would result in impairment in knee flexor muscle strength at 6 months postoperatively. Study Design: Retrospective cohort study. Level of Evidence: Level 2. Methods: A total of 186 patients were assigned to 2 groups according to the type of surgery: ACL + ALLR (graft: semitendinosus + gracilis, n = 119) or isolated ACLR (graft: semitendinosus, n = 67). The strength of the knee extensor and flexor muscles was assessed using an isokinetic dynamometer at 90, 180, and 240 deg/s for concentric and 30 deg/s for eccentric contractions and compared between groups using analysis of variance statistical parametric mapping. Results: Regardless of the surgery and the muscle, the injured leg produced significantly less strength than the uninjured leg throughout knee flexion and extension from 30° to 90° for each angular velocity (30, 90, 180, and 240 deg/s). However, the knee muscle strength was similar between the ACL + ALLR and ACLR groups. Conclusion: The addition of ALLR using the gracilis tendon during ACLR does not alter the muscle recovery observed at 6 months postoperatively. Clinical Relevance: Although more knee flexor muscle tendons were harvested in ACL + ALLR, the postoperative strength recovery was similar to that of isolated ACLR.

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Section: Discussionmentioning

confidence: 99%

Isokinetic Strength After ACL Reconstruction: Influence of Concomitant Anterolateral Ligament Reconstruction

et al. 2021

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“…Moreover, the types of stretching presented other conflicting results. Sekir, et al [28] observed that although passive stretching did not prejudice the ratio of strength of the hamstrings/quadriceps, it reduced the strength in both groups measured, and in the isokinetic evaluation at 60°/s and 180°/s pre-and post-stretching sessions. However, the cited authors concluded that in dynamic activities such as collective games, passive stretching did not harm the performance, differently from Akbulut and Agopyan [13], in which PNF stretching improved the kicking velocity performance of football players.…”

Section: Warming-up X Stretchingmentioning

confidence: 99%

Warm-up or Proprioceptive Neuromuscular Facilitation are Unnecessary before Anaerobic or Aerobic Power Exercise?

Alexandre¹,

Viana²,

Franca³

et al. 2020

Int J Sports Exerc Med

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Preparatory activities for physical exercise and/or sports competition are carried out with the improving performance and preventing injuries. Traditional Warm-up (TW), such as jogging and Proprioceptive Neuromuscular Facilitation (PNF) stretching, are two examples of activities used for this purpose. However, there is no consensus in the literature about their efficacy, and which of them is the best. The aim of this study was to compare the effects of TW and PNF on anaerobic power (AnP) and Aerobic Power (AP) and on physiological variables. In this study 10 (ten) men aged between 18 and 30 years, physically active, non-athletes, were evaluated in an external environment with an average temperature of 34 °C, in a crossover system in 04 different time intervals: TW (M1), PNF (M2), TW (M3) and PNF (M4) before the vertical jump test and 20m Yo-Yo tests, with an interval of one week between them. The AnP and AP values were calculated; the post-test lactate and heart rate were measured, and the volunteers were asked about Delayed Onset Muscle Soreness (DOMS) 24h the tests. One-way ANOVA was carried out to test the 04 time intervals, with significance established at 5%. There were no differences between the variables in the different time intervals. There was no difference in physical performance in any of the types of pre-exercise preparation activities. Furthermore, TW with elevation of body temperature and PNF that improve muscle length appeared to be dispensable for active young men in a warm environment.

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“…Ribeiro-Alvares, & Pinto, 2020;Beyer et al, 2016;Bogdanis & Kalapotharakos, 2016;Dauty, Potiron-Josse, & Rochcongar, 2003;Denadai, Oliveira, Camarda, Ribeiro, & Greco, 2016;El-Ashker, Carson, Ayala, & De Ste Croix, 2017;Guney, Yuksel, Kaya, & Doral, 2016;Pellicer-Chenoll et al, 2017;Sekir, Arabaci, & Akova, 2015), sin embargo su uso es muy limitado en deportistas de alto rendimiento durante el periodo competitivo, debido a su exigencia y su posterior tiempo de recuperación.En fútbol concretamente,Croisier, Ganteaume, Binet, Genty, and Ferret (2008) en su estudio longitudinal con casi 700 futbolistas, de los cuales pudieron hacer un seguimiento completo durante toda la temporada a 462, encontraron que los jugadores con un ratio I/C bajo, tenían entre 4 y 5 veces más probabilidad de lesionarse. Otros autores han llevado a cabo estudios similares con futbolistas de diferentes niveles(Ardern, Pizzari, Wollin, & Webster, 2015;Lehnert, Xaverová, & Croix, 2014).…”

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Análisis electromiográfico de la coactivación de cuádriceps e isquiotibiales en jugadores de fútbol

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Acute effects of static stretching on peak and end-range hamstring-to-quadriceps functional ratios

Cited by 11 publications

References 27 publications

Isokinetic Strength After ACL Reconstruction: Influence of Concomitant Anterolateral Ligament Reconstruction

Isokinetic Strength After ACL Reconstruction: Influence of Concomitant Anterolateral Ligament Reconstruction

Warm-up or Proprioceptive Neuromuscular Facilitation are Unnecessary before Anaerobic or Aerobic Power Exercise?

Análisis electromiográfico de la coactivación de cuádriceps e isquiotibiales en jugadores de fútbol

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