Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players
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 m...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-08-01
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| Series: | Frontiers in Physiology |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fphys.2020.00838/full |
| _version_ | 1818542562294628352 |
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| author | Manuel Becker Manuel Becker Billy Sperlich Christoph Zinner Silvia Achtzehn Silvia Achtzehn |
| author_facet | Manuel Becker Manuel Becker Billy Sperlich Christoph Zinner Silvia Achtzehn Silvia Achtzehn |
| author_sort | Manuel Becker |
| collection | DOAJ |
| description | 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 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. |
| first_indexed | 2024-12-11T22:23:43Z |
| format | Article |
| id | doaj.art-eafdbfd1b3e54a41a2a8e3a7bcf84576 |
| institution | Directory Open Access Journal |
| issn | 1664-042X |
| language | English |
| last_indexed | 2024-12-11T22:23:43Z |
| publishDate | 2020-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physiology |
| spelling | doaj.art-eafdbfd1b3e54a41a2a8e3a7bcf845762022-12-22T00:48:22ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2020-08-011110.3389/fphys.2020.00838536090Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer PlayersManuel Becker0Manuel Becker1Billy Sperlich2Christoph Zinner3Silvia Achtzehn4Silvia Achtzehn5Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Cologne, GermanyDecode Dynamics Sports Performance Institute, Waldbronn, GermanyIntegrative and Experimental Exercise Science and Training, Institute of Sport Science, University of Würzburg, Würzburg, GermanyDepartment of Sport, University of Applied Sciences for Police and Administration of Hesse, Wiesbaden, GermanyInstitute of Cardiology and Sports Medicine, German Sport University Cologne, Cologne, GermanyThe German Research Centre of Elite Sport, German Sport University Cologne, Cologne, GermanyThe 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.https://www.frontiersin.org/article/10.3389/fphys.2020.00838/fullbiomarker variabilitycreatine kinasesocceryouth soccerinternal loadmonitoring |
| spellingShingle | Manuel Becker Manuel Becker Billy Sperlich Christoph Zinner Silvia Achtzehn Silvia Achtzehn Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players Frontiers in Physiology biomarker variability creatine kinase soccer youth soccer internal load monitoring |
| title | Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players |
| title_full | Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players |
| title_fullStr | Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players |
| title_full_unstemmed | Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players |
| title_short | Intra-Individual and Seasonal Variation of Selected Biomarkers for Internal Load Monitoring in U-19 Soccer Players |
| title_sort | intra individual and seasonal variation of selected biomarkers for internal load monitoring in u 19 soccer players |
| topic | biomarker variability creatine kinase soccer youth soccer internal load monitoring |
| url | https://www.frontiersin.org/article/10.3389/fphys.2020.00838/full |
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