Sand vs grass

The aim of this study was to investigate the effect of five-week plyometric training (PT) using different surfaces (sand vs. grass) on sprint and jump performance in young soccer players of the under-20 category. Nineteen soccer players from a professional club in São Paulo (19.3 ± 1.1 years, 1.78 ± 0.06 m; 71.1 ± 6.84 kg) participated in the study. The subjects were divided into 2 groups that performed PT on sand (n=10) or grass (n=9) for five weeks. The results indicated an improvement in performance, as measured by the squat jump (Sand: 18.2%; Grass: 17.6%), countermovement jump (Sand: 12.5%; Grass: 12.4%), drop jump from 44cm (Sand: 8.3%; Grass: 5.8%), drop jump from 66 cm (Sand: 7.5%; Grass: 7.1%), drop jump from 88cm (Sand: 6.5%; Grass: 5.7%), and 15m sprint time (Sand: -2.2%; Grass: -2.3%). However, no significant difference was found between the two surfaces. In conclusion, 5-week PT on either sand or grass surfaces can improve sprint and jump performance in young soccer players.

本研究旨在探究使用不同表面（沙地与草地）进行的为期五周的爆发力训练（PT）对年轻足球运动员（20岁以下）短跑和跳跃表现的影响。来自圣保罗一家职业俱乐部的19名足球运动员（平均年龄19.3 ± 1.1岁，身高1.78 ± 0.06米，体重71.1 ± 6.84公斤）参与了本研究。参与者被分为两组，一组在沙地上进行PT训练（n=10），另一组在草地上进行PT训练（n=9），为期五周。结果显示，在蹲跳（沙地：提高18.2%，草地：提高17.6%）、反向跳跃（沙地：提高12.5%，草地：提高12.4%）、从44厘米高度落地跳跃（沙地：提高8.3%，草地：提高5.8%）、从66厘米高度落地跳跃（沙地：提高7.5%，草地：提高7.1%）、从88厘米高度落地跳跃（沙地：提高6.5%，草地：提高5.7%）以及15米短跑时间（沙地：减少-2.2%，草地：减少-2.3%）等方面均观察到表现有所提升。然而，两种表面之间并未发现显著的差异。综上所述，无论是沙地还是草地，为期五周的PT训练均能提升年轻足球运动员的短跑和跳跃表现。