Th e purpose of the present study was to investigate the eff ects of exponential and linear tapering protocols on the distance covered according to playing positions among junior elite soccer players. One-hundred and fi ft y-eight junior elite soccer players (mean age: 17.07±0.79 years; mean height: 177.85±6.64 cm; mean weight: 71.27±7.96 kg; mean body-mass index: 22.50±1.66 kg/m2) were randomly selected into two groups: (1) exponential and (2) linear tapering group. Training sessions were conducted three times a week for eight weeks. Aft er four and eight weeks of the tapering period, participants were measured in the distance covered according to four basic playing positions on the fi eld: (1) goalkeepers, (2) defenders, (3) midfi elders, and (4) forwards. Th e results showed that the largest eff ects between the preand post-measurement had defenders in the exponential and goalkeepers in the linear group, goalkeepers in the distance covered by slow and medium running in both groups, forwards in fast running and sprinting in the exponential group, and midfi elders in the linear group. In conclusion, our results suggest that the exponential tapering protocol brought somewhat larger eff ects, especially in fast running and sprinting in forwards and slow and medium running in goalkeepers. Future studies need to implement both the exponential and the linear tapering protocols in order to enhance performance but favouring the exponential to produce larger eff ects.

中文翻译：

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初级精英足球运动员的指数与线性逐渐变细：根据比赛位置对身体比赛表现的影响

本研究的目的是根据初级精英足球运动员的比赛位置，研究指数和线性渐缩协议对覆盖距离的影响。一百零八名初级足球运动员（平均年龄：17.07±0.79岁;平均身高：177.85±6.64 cm;平均体重：71.27±7.96 kg;平均身体质量指数：22.50±1.66 kg / m2 ）随机分为两组：（1）指数组和（2）线性渐缩组。培训课程每周进行3次，共8周。在逐渐减少的第4周和第8周之后，根据场上的四个基本比赛位置对参与者的距离进行了测量：（1）守门员，（2）防守者，（3）中场长辈和（4）前锋。结果表明，测量前和测量后之间最大的影响是指数组的守门员和线性组的守门员，两组中慢速和中速跑所覆盖的距离的守门员，指数级的快跑和冲刺向前组和线性组中的中老年人。总之，我们的结果表明，指数渐缩协议带来了更大的影响，尤其是在前卫的快跑和短跑以及守门员的慢速和中速跑中。未来的研究需要同时实现指数和线性渐减协议，以提高性能，但有利于指数以产生更大的效果。指数组中快跑和冲刺前进，线性组中长跑。总之，我们的结果表明，指数渐缩协议带来了更大的影响，尤其是在前卫的快跑和短跑以及守门员的慢速和中速跑中。未来的研究需要同时实现指数和线性渐减协议，以提高性能，但有利于指数以产生更大的效果。指数组中快跑和冲刺前进，线性组中长跑。总之，我们的结果表明，指数渐缩协议带来了更大的影响，尤其是在前卫的快跑和短跑以及守门员的慢速和中速跑中。未来的研究需要同时实现指数和线性渐减协议，以提高性能，但有利于指数以产生更大的效果。