Kyprianou Efthymios, Lolli Lorenzo, Weston Matthew, Gregson Warren
Football Exchange, Research Institute of Sport Sciences, Liverpool John Moores University, Liverpool, United Kingdom.
Department of Performance & Science, Houston Dynamo Football Club, Houston, TX, USA.
Int J Sports Physiol Perform. 2023 Aug 30;18(11):1254-1262. doi: 10.1123/ijspp.2022-0428. Print 2023 Nov 1.
To examine the moderating effect of familiarization on the relationship between external load and ratings of perceived exertion (RPEs) in elite youth soccer players.
Thirty-five elite male youth soccer players were monitored over a 31-week period. Players had no previous experience using the centiMax scale (arbitrary units [AU]). The final sample included familiarized (blackness test; n = 20) and nonfamiliarized players (n = 15) with the Borg centiMax scale. Players recorded a global RPE and differential RPEs (dRPE) for breathlessness (RPE-B) and leg-muscle exertion (RPE-L) 15 to 30 minutes following training sessions and competitive matches. Separate multivariable-adjusted random-effects generalized additive models with restricted maximum likelihood quantified familiarization versus no-familiarization differences in actual perceived exertion score (in AU) by number of accelerations, decelerations, and high-speed running distance (in meters) as predictor variables, respectively.
Players improved their blackness test score from 39% to 78%. For explorations by number of accelerations, familiarization effects were not practically relevant for the RPE and RPE-B variables. The width and sign of the effects for the RPE-L variable at 30 efforts of 10 AU (95% CI, 4-16 AU) suggested that scores were lower for players who underwent familiarization versus players who did not. Familiarization effects were not practically relevant for any RPE variable irrespective of the number of deceleration efforts and high-speed running distance covered.
Improved performance on the blackness test did not have a moderating effect on the relationship between proxy measures of external load and RPEs.
探讨熟悉程度对精英青少年足球运动员外部负荷与主观用力感觉（RPE）之间关系的调节作用。
在31周的时间里对35名精英男性青少年足球运动员进行监测。球员此前没有使用厘泊量表（任意单位[AU]）的经验。最终样本包括熟悉Borg厘泊量表的球员（黑度测试；n = 20）和不熟悉该量表的球员（n = 15）。球员在训练课和比赛后15至30分钟记录整体RPE以及呼吸困难（RPE-B）和腿部肌肉用力（RPE-L）的差异RPE（dRPE）。分别采用具有限制最大似然法的多变量调整随机效应广义相加模型，以加速度、减速度和高速跑距离（以米为单位）的数量作为预测变量，量化熟悉与不熟悉在实际主观用力感觉得分（以AU为单位）方面的差异。
球员的黑度测试得分从39%提高到了78%。对于按加速度数量进行的探究，熟悉程度对RPE和RPE-B变量实际上没有影响。在10 AU的30次用力时，RPE-L变量效应的宽度和符号（95%CI，4 - 16 AU）表明，接受熟悉训练的球员得分低于未接受熟悉训练的球员。无论减速用力次数和高速跑距离如何，熟悉程度对任何RPE变量实际上都没有影响。
黑度测试表现的提高对外部负荷替代指标与RPE之间的关系没有调节作用。
