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  • 1
    In: International Journal of Sports Science & Coaching, SAGE Publications, Vol. 18, No. 4 ( 2023-08), p. 994-1002
    Abstract: The importance of considering information related to athletes’ biological maturation within talent identification and development processes is frequently emphasized by both sport scientists and practitioners. Although there is evidence for the use of objective diagnostics for assessing biological maturation, little is known about its subjective determinations by coaches. Such approaches are particularly relevant when scientific support is limited. Therefore, the current study aimed to compare a practical subjective approach (coaches’ eye) to assess biological maturity timing (BMT) with objective reference diagnostics (MRI). For this purpose, data were collected from 63 male elite soccer players of the U12 and U14 age group who were part of the German talent promotion program. Players’ BMT (i.e., skeletal – chronological age) was assessed by MRI and a subjective rating of two coaches. Data analyses revealed high-rank correlations ( r s  = .55; p  〈  .001) for the total sample as well as for U14 players ( r s  = .65; p  〈  .001) and moderate rank correlations for U12 players ( r s  = .42; p  〈  .05). Single case analyses showed substantial agreements between the diagnostics. However, particularly for U12 players, judgements did not always correspond with the MRI rankings. Although coaches seem to have the ability for recognizing the earliest and latest maturing players in the sample, inconsistencies exist in single cases, especially for players that were identified on-time by objective MRI diagnostics. Although utilizing subjective coach assessments as an alone-standing tool to assess a player's BMT is not recommended in applied practice, its use can be beneficial when applied in addition to common objective diagnostics or in circumstances where objective data are not available.
    Type of Medium: Online Resource
    ISSN: 1747-9541 , 2048-397X
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2237333-0
    SSG: 31
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  • 2
    In: Frontiers in Sports and Active Living, Frontiers Media SA, Vol. 2 ( 2020-12-15)
    Abstract: The influence of biological maturity status (BMS) on talent identification and development within elite youth soccer is critically debated. During adolescence, maturity-related performance differences within the same age group may cause greater chances of being selected for early maturing players. Therefore, coaches need to consider players' BMS. While standard methods for assessing BMS in adolescents are expensive and time-consuming imaging techniques (i.e., X-ray and MRI), there also exist more pragmatic procedures. This study aimed to evaluate commonly used methods to assess BMS within a highly selected sample of youth soccer players. A total of N = 63 elite male soccer players (U12 and U14) within the German Soccer Association's talent promotion program completed a test battery assessing BMS outcomes. Utilizing MRI diagnostics, players' skeletal age (SA MRI ) was determined by radiologists and served as the reference method. Further commonly used methods included skeletal age measured by an ultrasound device (SA US ), the maturity offset (MO MIR ), and the percentage of adult height (PAH KR ). The relation of these alternative BMS outcomes to SA MRI was examined using different perspectives: performing bivariate correlation analyses (1), modeling BMS as a latent variable (BMS lat ) based on the multiple alternative diagnostics (2), and investigating individual differences in agreement (3). (1) Correlations of SA MRI and the further BMS variables ranked from r = 0.80 to r = 0.84 for the total sample and were lower for U12 (0.56 ≤ r ≤ 0.66), and U14 (0.61 ≤ r ≤ 0.74) (2). The latent structural equation modeling (SEM) ( R 2 = 51%) revealed a significant influence on BMS lat for MO MIR (β = 0.51, p & lt;0.05). The additional contribution of PAH KR (β = 0.27, p = 0.06) and SA US (β = −0.03, p = 0.90) was rather small (3). The investigation of individual differences between the reference method and alternative diagnostics indicated a significant bias for MO MIR ( p & lt;0.01). The results support the use of economical and time-efficient methods for assessing BMS within elite youth soccer. Bivariate correlation analyses as well as the multivariate latent variable approach highlight the measures' usefulness. However, the observed individual level differences for some of the utilized procedures led to the recommendation for practitioners to use at least two alternative assessment methods in order to receive more reliable information about players' BMS within the talent promotion process.
    Type of Medium: Online Resource
    ISSN: 2624-9367
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2969725-6
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  • 3
    Online Resource
    Online Resource
    Ovid Technologies (Wolters Kluwer Health) ; 2023
    In:  Topics in Magnetic Resonance Imaging Vol. 32, No. 5 ( 2023-10), p. 50-55
    In: Topics in Magnetic Resonance Imaging, Ovid Technologies (Wolters Kluwer Health), Vol. 32, No. 5 ( 2023-10), p. 50-55
    Abstract: Skeletal bone age assessment for medical reasons is usually performed by conventional x-ray with use of ionizing radiation. Few pilot studies have shown the possible use of magnetic resonance imaging (MRI). Purpose: To comprehensively evaluate feasibility and value of MRI for skeletal bone age (SBA) assessment in healthy male children. Materials and Methods: In this prospective cross-sectional study, 63 male soccer athletes with mean age of 12.35 ± 1.1 years were examined. All participants underwent 3.0 Tesla MRI with coronal T1-weighted turbo spin echo (TSE), coronal proton density (PD)–weighted turbo spin echo (TSE), and T1-weighted three-dimensional (3D) volume interpolated breath-hold examination (VIBE) sequence. Subsequently, SBA was assessed by 3 independent blinded radiologists with different levels of experience using the common Greulich-Pyle (GP) atlas and the Tanner-Whitehouse (TW2) method. Results: In a mean total acquisition time of 5:04 ± 0:47 min, MR image quality was sufficient in all cases. MRI appraisal was significantly faster ( P 〈 0.0001) by GP with mean duration of 1:22 ± 0:08 min vs. 7:39 ± 0:28 min by TW. SBA assessment by GP resulted in mean age of 12.8 ± 1.2 years, by TW 13.0 ± 1.4 years. Interrater reliabilities were excellent for both GP (ICC = 0.912 (95% confidence interval [CI] = 0.868–0.944) and TW (ICC = 0.988 (95% CI = 0.980–0.992) and showed statistical significance ( P 〈 0.001). Subdivided, for GP, ICCs were 0.822 (95% CI = 0.680–0.907) and 0.843 (95% CI = 0.713–0.919) in Under 12 and Under 14 group. For TW, ICCs were 0.978 (95% CI = 0.958–0.989) in Under 12 and 0.979 (95% CI = 0.961–0.989) in Under 14 group. Conclusion: MRI is a clinically feasible, rapidly evaluable method to assess skeletal bone age of healthy male children. Using the Greulich-Pyle (GP) atlas or the Tanner-Whitehouse (TW2) method, reliable results are obtained independent of the radiologist's experience level.
    Type of Medium: Online Resource
    ISSN: 1536-1004
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
    detail.hit.zdb_id: 2052832-2
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  • 4
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2020
    In:  BMC Research Notes Vol. 13, No. 1 ( 2020-12)
    In: BMC Research Notes, Springer Science and Business Media LLC, Vol. 13, No. 1 ( 2020-12)
    Abstract: Bio-banding (BB) has been introduced to account for varying maturity and to improve the talent development of junior soccer players. To date, research that investigated the physiological and technical effects of BB is sparse. Therefore, the aim of the study was to compare effects of BB with CA on selected technical and tactical parameters in U13 and U14 soccer players. Results BB significantly increased the number of duels ( p  = 0.024) and set pieces ( p  = 0.025) compared to chronological age. The mean time of ball possession per action was reduced ( p  = 0.021) and the rate of successful passes was lower with BB ( p  = 0.001). Meanwhile, the total number of passes was unaffected ( p  = 0.796), and there was a trend towards a lower difference in ball possession between BB teams ( p  = 0.058). In addition, BB reduced the distances covered while jogging ( p  = 0.001), running ( p  = 0.038) and high-speed running ( p  = 0.035). With BB, an increased number of duels, unsuccessful passes and set pieces resulted in a quicker change of match play situations between teams. While physical demand was reduced, BB seems to result in a more technically and tactically challenging game. Benefits in long-term player development, however, require further investigation.
    Type of Medium: Online Resource
    ISSN: 1756-0500
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2413336-X
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  • 5
    Online Resource
    Online Resource
    Informa UK Limited ; 2022
    In:  Journal of Sports Sciences Vol. 40, No. 14 ( 2022-07-18), p. 1641-1647
    In: Journal of Sports Sciences, Informa UK Limited, Vol. 40, No. 14 ( 2022-07-18), p. 1641-1647
    Type of Medium: Online Resource
    ISSN: 0264-0414 , 1466-447X
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2001639-6
    SSG: 31
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  • 6
    Online Resource
    Online Resource
    Informa UK Limited ; 2023
    In:  Journal of Sports Sciences Vol. 41, No. 8 ( 2023-04-18), p. 758-765
    In: Journal of Sports Sciences, Informa UK Limited, Vol. 41, No. 8 ( 2023-04-18), p. 758-765
    Type of Medium: Online Resource
    ISSN: 0264-0414 , 1466-447X
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2001639-6
    SSG: 31
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  • 7
    Online Resource
    Online Resource
    Informa UK Limited ; 2022
    In:  European Journal of Sport Science Vol. 22, No. 11 ( 2022-11-02), p. 1659-1667
    In: European Journal of Sport Science, Informa UK Limited, Vol. 22, No. 11 ( 2022-11-02), p. 1659-1667
    Type of Medium: Online Resource
    ISSN: 1746-1391 , 1536-7290
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2038559-6
    SSG: 31
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