Centre for Sports Science and University Sports, University of Vienna, Vienna, Austria.
Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy.
PLoS One. 2022 Jun 10;17(6):e0269810. doi: 10.1371/journal.pone.0269810. eCollection 2022.
Agility and change of direction speed are two different abilities, but no study has investigated if this difference exists also in fatigued conditions, and whether fatigue develops in a different way in a repeated-trial scenario. Fourteen soccer players (age: 17.0 ± 0.4 yrs; height: 176.9 ± 6.5 cm; body mass: 69.2 ± 6.4 kg) competing in a national-level youth league completed in a randomized counter-balanced crossover design a repeated agility protocol (RA) and a repeated change-of-direction one (RCOD), both consisting in performing 20 consecutive repetitions (work:rest ratio 1:5). The 20 repetitions were divided into 4 blocks (each block containing 5 repetitions) for the analysis. Results show that agility and COD are two different abilities both in rest and fatigue conditions: block 1 RA vs 1 RCOD (p < 0.001; ES = 2.02 huge; r = 0.17 poor; r2 = 0.03), 2 RA vs 2 RCOD (p < 0.001; ES = 2.3 huge; r = 0.51 fair; r2 = 0.26), 3 RA vs 3 RCOD (p < 0.001; ES = 2.38 huge; r = 0.54 fair; r2 = 0.29), and 4 RA vs 4 RCOD (p < 0.001; ES = 2.7 huge; r = 0.41 fair; r2 = 0.17). However, the fatigue development in both conditions was similar, with a percentage decrement score (Sdec) of 7.5% for RA, and 7.3% for RCOD. Ratings of perceived exertions (RPE) were similar too (7.3 ± 1.7, and 6.6 ± 1.9, for RA and RCOD, respectively). However, a significant fatigue-related performance impairment arose earlier in RA (block 2) than in RCOD (block 3). Total RA and total RCOD times were significantly different (p < 0.001; ES = 2.65 huge; r = 0.41 fair; r2 = 0.17), suggesting that they are two different and independent abilities.
敏捷性和变向速度是两种不同的能力，但目前还没有研究表明这种差异是否也存在于疲劳状态下，以及疲劳是否以不同的方式在重复试验场景中发展。14 名参加国家级青年联赛的足球运动员（年龄：17.0±0.4 岁；身高：176.9±6.5 厘米；体重：69.2±6.4 公斤）采用随机交叉设计完成了重复敏捷性测试（RA）和重复变向测试（RCOD），两种测试均包含 20 次连续重复（工作：休息比为 1:5）。20 次重复分为 4 个块（每个块包含 5 次重复）进行分析。结果表明，在休息和疲劳状态下，敏捷性和变向速度是两种不同的能力：第 1 块 RA 与第 1 块 RCOD（p<0.001；ES=2.02 巨大；r=0.17 较差；r2=0.03），第 2 块 RA 与第 2 块 RCOD（p<0.001；ES=2.3 巨大；r=0.51 良好；r2=0.26），第 3 块 RA 与第 3 块 RCOD（p<0.001；ES=2.38 巨大；r=0.54 良好；r2=0.29），第 4 块 RA 与第 4 块 RCOD（p<0.001；ES=2.7 巨大；r=0.41 良好；r2=0.17）。然而，两种情况下的疲劳发展相似，RA 的百分比下降分数（Sdec）为 7.5%，RCOD 为 7.3%。感知用力（RPE）评分也相似（RA 为 7.3±1.7，RCOD 为 6.6±1.9）。然而，RA 中更早出现与疲劳相关的运动表现下降（第 2 块），而 RCOD 中则在第 3 块。RA 和 RCOD 的总用时有显著差异（p<0.001；ES=2.65 巨大；r=0.41 良好；r2=0.17），这表明它们是两种不同的、独立的能力。
