EFFECTS OF DOSE-RESPONSE OF NORDIC HAMSTRING EXERCISE ON MUSCLE PERFORMANCE IN ATHLETES, A RANDOMIZED CONTROLLED TRIAL

The open rehabilitation journal Pub Date : 2022-09-30 DOI:10.52567/trj.v6i03.162

Saeed Ullah, A. Razzaq, Huma Riaz, Suman Sheraz

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Abstract

Background: The Nordic Hamstring muscle training is effective for eccentric strengthening of the hamstring in a sports population. Due to its high volume, its compliance is low and researchers are working to find out its lowest effective dose. Objectives: To determine the effects of dose-response of Nordic hamstring exercise on hamstring muscle performance. Methods: A randomized controlled trial was conducted from August to November 2020 and comprised of athletes of both genders who were randomized into high (3 times/week, 4 weeks) and low volume (1 time/week, 4weeks) Nordic hamstring exercise groups. The Outcome measures were taken using the single leg hamstring bridge test for hamstring strength, 30-m speed test, agility T-test, anthropometric measurement at 5cm, 10cm, 15cm above the patella. The assessments were taken at baseline, 2nd and 4th weeks. The data were analysed using SPSS 23. Results: There were 30(88.2%) males and 4(11.8%) females with a mean age of 23.41±3.67years and a mean BMI of 18.6±3.16. A significant difference (p<0.001) was observed between both groups for all outcome variables post-exercise protocol at 2nd and 4th week. Conclusion: The Nordic hamstring exercise was effective in improving hamstring muscle performance. The higher dose of Nordic Hamstring Exercise was more effective than the lower dose in improvement in muscle size, strength, speed and agility of the participants after 4 weeks of training. Keywords: Agility, athletes, hamstring injuries, muscle strength, nordic hamstring exercises, speed

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北欧腿筋运动对运动员肌肉表现的剂量反应效应，一项随机对照试验

背景:北欧腿筋肌肉训练对运动人群的腿筋偏心强化是有效的。由于其体积大，其依从性很低，研究人员正在努力找出其最低有效剂量。目的:探讨北欧腘绳肌运动的剂量反应对腘绳肌运动性能的影响。方法:于2020年8月至11月进行随机对照试验，将男女运动员随机分为高量(3次/周，4周)和低量(1次/周，4周)北欧腿筋运动组。结果采用单腿腘绳肌桥试验测定腘绳肌力量、30米速度试验、敏捷性t检验、髌骨以上5cm、10cm、15cm的人体测量。在基线、第2周和第4周进行评估。数据采用SPSS 23进行分析。结果:男性30例(88.2%)，女性4例(11.8%)，平均年龄23.41±3.67岁，平均BMI为18.6±3.16。两组在运动后第2周和第4周的所有结果变量均有显著差异(p<0.001)。结论:北欧腘绳肌运动能有效提高腘绳肌的运动性能。在4周的训练后，高剂量的北欧腿筋运动比低剂量的更有效地改善了参与者的肌肉大小、力量、速度和敏捷性。关键词:敏捷性，运动员，腿筋损伤，肌肉力量，北欧腿筋运动，速度

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The open rehabilitation journal

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