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Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players
Please always quote using this URN: urn:nbn:de:bvb:20-opus-209616
- The aim of this study was to investigate inter-day and -week as well as intra- and inter-individual variation of selected biomarkers in high-performance youth soccer players to assist practitioners interpreting player’s internal load to counteract underperformance and unwanted health risks. Eleven male youth soccer players were tested multiple times during two 3-week periods at midpoint (3-wkmid) and at the end (3-wkend) of the first half of a German under-19 1. Bundesliga season. The levels of creatine kinase (CK), urea, and C-reactive proteinThe aim of this study was to investigate inter-day and -week as well as intra- and inter-individual variation of selected biomarkers in high-performance youth soccer players to assist practitioners interpreting player’s internal load to counteract underperformance and unwanted health risks. Eleven male youth soccer players were tested multiple times during two 3-week periods at midpoint (3-wkmid) and at the end (3-wkend) of the first half of a German under-19 1. Bundesliga season. The levels of creatine kinase (CK), urea, and C-reactive protein (CRP) were measured during 3-wkmid and 3-wkend each Monday, Wednesday, and Friday. In 3-wkmid the CK median was 14% higher (241 vs. 212 U/L) compared to 3-wkend (P = 0.26, ES = 0.16). Overall, the medians of CK, urea (P = 0.59, ES = 0.08), and CRP (P = 0.56, ES = 0.10) during 3-wkmid did not differ to the values of 3-wkend. Daily coefficient of variations (CVs) ranged from 22 to 71% (CK), 17 to 37% (urea), and 9 to 164% (CRP). Individual medians ranged from 101 to 350 U/L (CK), 23 to 50 mg/dL (urea), and 0.6 to 1.1 mg/L (CRP). High intra-individual variability was demonstrated by large intra-individual CVs (medians: CK 50%, urea 18%, and CRP 45%). Our data show (i) large inter-day and inter-week variability of all biomarkers, depending on the external load and (ii) considerable inter- and intra-individual parameter variations. Creatine kinase concentrations could sensitively reflect soccer-specific loads during the season.…
Author: | Manuel Becker, Billy Sperlich, Christoph Zinner, Silvia Achtzehn |
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URN: | urn:nbn:de:bvb:20-opus-209616 |
Document Type: | Journal article |
Faculties: | Fakultät für Humanwissenschaften (Philos., Psycho., Erziehungs- u. Gesell.-Wissensch.) / Institut für Sportwissenschaft |
Language: | English |
Parent Title (English): | Frontiers in Physiology |
ISSN: | 1664-042X |
Year of Completion: | 2020 |
Volume: | 11 |
Issue: | 838 |
Source: | Frontiers in Physiology 2020, 11:838. doi: 10.3389/fphys.2020.00838 |
DOI: | https://doi.org/10.3389/fphys.2020.00838 |
Dewey Decimal Classification: | 6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit |
Tag: | biomarker variability; creatine kinase; internal load; monitoring; point of care testing; soccer; youth soccer |
Release Date: | 2020/09/21 |
Date of first Publication: | 2020/08/04 |
Open-Access-Publikationsfonds / Förderzeitraum 2020 | |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |