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Source publication
This thesis is based on a series of publications that were conducted with the aim of improving the assessment and development of sprint performance in junior AF players. Specifically, the objectives of the thesis were to examine the underlying FVP characteristics of maximum sprint performance through cross-sectional analysis across competition leve...
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Background
To investigate the relationship between an oval optic disc and the occurrence of myopic foveoschisis (MF) using swept-source optic coherence tomography (SS-OCT).
Methods
Fifty eyes of 25 patients with unilateral MF were included in this retrospective observational study. The biometric features of the optic disc and peripapillary structu...
Citations
... Training should be advised based on the individual needs of the athlete. Practitioners should aim to improve the lower limbs' force-producing capabilities, technique, and coordination in junior tennis players during maturation to enhance performance (10,29). Additionally, testing and training motor abilities and skills are essential to consider when discussing performance improvements during maturation. ...
Purpose
This study aimed to correlate sprint mechanical parameters (SMP) of a linear sprint (LS) and a tennis specific modified 505 (Tm505) change of direction (CoD) test obtained with a motorized resistance device (MRD) to the current tennis ranking position (RP).
Methods
107 male and 86 female elite junior tennis players nationally ranked in the German Tennis Federation between 10 and 18 years participated in the study. According to their age at peak height velocity (PHV), players were divided into pre-PHV, circa-PHV, and post-PHV groups. SMP were derived from instantaneous time-velocity data of two 20 m all-out LS measured with 333 Hz. Further, mean values from two Tm505 trials with constant 3 kg loading over acceleration-deceleration (1a) and reacceleration (1b) phases were measured with an MRD. SMP of LS and CoD measurements were partially correlated with the current RP in the overall national ranking by controlling for biological maturation.
Results
Low to moderate correlations ( r s = −0.1 to −0.3) were found between SMP and the RP in all male and female age groups. Correlations of the CoD measurements were overall more pronounced, particularly in girls ( r s = −0.44). All linear SMP, like maximal theoretical force (F 0 ; N/kg), and maximal theoretical velocity (v 0 ; m/s), maximal power (P max ; W/kg), improved over maturation for both genders with P max being most important for sprint performance. Further, P max was shown to correlate with the girls ranking position ( r s = −0.31). During the Tm505, matured players achieved significantly faster overall total and CoD times. Positioning of CoM before CoD enlarged over maturation and was found to correlate to the RP in both sexes. In addition, nearly all SMP significantly correlated to the primary performance outcomes in the Tm505 test in both genders ( r = −0.3 to −0.6).
Conclusion
CoD performance has a moderate and higher impact on tennis performance compared to LS. CoD performance as well as P max achieved a higher relevance for the ranking position predominantly in girls compared to boys. Hence, particularly P max as well as the transfer to on-court CoD motor skills should be a central training goal in elite junior tennis players besides technical skills and should depend on maturation status and gender.
