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Wearable Inertial Measurement Unit to Accelerometer-Based Training Monotony and Strain during a Soccer Season: A within-Group Study for Starters and Non-Starters
Author(s) -
Hadi Nobari,
Mustafa Söğüt,
Rafael Oliveira,
Jorge PérezGómez,
Katsuhiko Suzuki,
Hassane Zouhal
Publication year - 2021
Publication title -
international journal of environmental research and public health/international journal of environmental research and public health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.747
H-Index - 113
eISSN - 1661-7827
pISSN - 1660-4601
DOI - 10.3390/ijerph18158007
Subject(s) - starter , accelerometer , football players , zoology , match play , mathematics , psychology , physical therapy , demography , football , medicine , geography , biology , computer science , food science , archaeology , operating system , sociology
The purpose of this study was to analyze the intragroup differences in weekly training monotony (TM) and training strain (TS) between starter and non-starter male professional soccer players at accelerometry based variables throughout the periods of a season. TM and TS of different accelerations and decelerations zones for twenty-one players were followed for forty-eight weeks. Regardless of group, players obtained the highest mean TM (starters = 3.3 ± 0.6, non-starters = 2.2 ± 1.1, in arbitrary unit, AU) and TS (starters = 1288.9 ± 265.2, non-starters = 765.4 ± 547.5, AU) scores in the pre-season for accelerations at Zone 1 (<2 m/s 2 ). The results also indicated that both groups exhibited similar TM and TS scores in accelerations at Zones 2 (2 to 4 m/s 2 ) and 3 (>4 m/s 2 ) across the entire season. While the starters showed the highest TM and TS scores at deceleration Zone 1 (<-2 m/s 2 ) in the end-season, the non-starters exhibited the highest scores at the deceleration Zone 1 in pre-season. It seems that in pre-season, coaches applied higher levels of training with greater emphasis on deceleration for non-starters. This tendency was reduced over time for non-starters, while starters presented higher values of deceleration Zone 1. These results highlight the variations in TM and TS across the different periods of a full season according to match starting status among professional soccer players, and the results suggest that non-starter players should receive higher levels of load to compensate for non-participation in matches throughout a soccer season.

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