Within-Subject Principal Component Analysis of External Training Load and Intensity Measures in Youth Soccer Training

主成分分析 自感劳累评分 培训(气象学) 会话(web分析) 强度(物理) 重复措施设计 数学 心理学 统计 计算机科学 医学 心率 气象学 物理 量子力学 万维网 血压 放射科
作者
Jakub Marynowicz,Mateusz Lango,Damian Horna,Karol Kikut,Marek Konefał,Paweł Chmura,Marcin Andrzejewski
出处
期刊:Journal of Strength and Conditioning Research [Lippincott Williams & Wilkins]
卷期号:37 (12): 2411-2416
标识
DOI:10.1519/jsc.0000000000004545
摘要

Abstract Marynowicz, J, Lango, M, Horna, D, Kikut, K, Konefał, M, Chmura, P, and Andrzejewski, M. Within-participant principal component analysis of external training load and intensity measures in youth soccer training. J Strength Cond Res 37(12): 2411–2416, 2023—The aim of this study was to identify which combination of external training load (EL) and external intensity (EI) metrics during youth soccer training sessions captured similar or unique information. Data were collected from 18 youth soccer players during an 18-week in-season competition period using a 10-Hz global positioning system, rating of perceived exertion (RPE), and session-RPE (sRPE). External training load measures included total distance (TD, in meters), PlayerLoad (PL, in arbitrary units), high-speed running distance (HSR, in meters), and number of accelerations (ACC, n). All EL metrics were also divided by session duration (minutes) to obtain EI values. A total of 804 training observations were undertaken (43 ± 17 sessions per player). The analysis was performed by use of the principal component analysis technique. The first principal component (PC) captured 49–70% and 68–89% of the total variance in EI and EL, respectively. The findings show that from the 5 EI metrics, most of the information can be explained by either TD per minute or PL per minute, with a loading from 0.87 to 0.98 and from 0.76 to 0.95, respectively. The majority of EL information can be explained by PL (loading: 0.93–0.98), TD (loading: 0.95–0.99), ACC (loading: 0.71–0.91), or sRPE (loading: 0.70–0.93). The second PC for EL metrics is most strongly correlated with HSR, with loadings from 0.53 to 0.84. The results suggest that the majority of the information contained in the EL variables can be captured in 1 PC without losing much information. The findings suggest that stakeholders who intend to provide a fast and holistic view of EL information in a daily training environment should report TD, PL, ACC, or sRPE plus HSR to coaching staff as a metrics that provides additional unique information.
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