Bangsbo, Jens

Gunnarsson, Thomas Gunnar Petursson

Rasmussen, Lars Raundahl

Rostgaard, Thomas

Siggaard, Peder

English

Copenhagen University Research Information System

u n i ve r s i t y  o f  co pe n h ag e n  Københavns UniversitetChange of direction skills in elite football players in relation to speed qualities andcompetitive levelRostgaard, Thomas; Rasmussen, Lars Raundahl; Siggaard, Peder; Gunnarsson, ThomasGunnar Petursson; Bangsbo, JensPublication date:2012Citation for published version (APA):Rostgaard, T., Rasmussen, L. R., Siggaard, P., Gunnarsson, T. G. P., & Bangsbo, J. (2012). Change ofdirection skills in elite football players in relation to speed qualities and competitive level. Poster sessionpresented at World Conference on Science and Soccer, Ghent, Belgium.Download date: 02. Feb. 2020D E P A R T M E N T  O F  E X  E R C I S E  A N D  S P O R T  S C I E N C E S U N I V E R S I T Y   O F   C O P E N H A G E N  RESULTS:  Adult elite players showed superior COD test performance (+4.2%) compared to youth elite players (p<0.05) (fig.3). Test results in the 5, 10, and 30 m sprint test showed no differences when the two level of players were compared (AE vs. YE players, p>0.05) (tab.1). COD test performance was not related to the sprinting performance measures in either group of players (p>0.05) (tab. 1). COD test-retest performance in the YE group was not different and the CV was 1.1% (fig.4).     CONCLUSION/DISCUSSION:  The lack of relationship between COD and straight line sprinting performance suggest that COD ability is an independent measure of performance, and that it should be tested accordingly. The COD test can reveal a difference between two levels of elite football players, and due to its high level of reproducibility, the COD test may serve as a valuable tool in the selection process of talented football players in the transition from youth to adult level elite football.     REFERENCES:  Bangsbo, J. The physiology of soccer – with special reference to intense intermittent exercise. Acta Physiol Scand Suppl.1994;619:1-155.  Young WB, McDowell MH, Scarlett BJ. Specificity of sprint and agility training methods. J Strength Cond Res. 2001 Aug;15(3):315-9.  Change of direction skills in elite football players in relation to speed qualities and competitive level  INTRODUCTION:  It is well-established that football players during the course of a game perform intermittent exercise with changes in activity every 3–5 seconds.  Due to multiple brief intense actions involving jumps, turns, tackles, high speed runs, and sprints the game of football is physically demanding (Bangsbo, 1994), and requires a highly complex hybrid of physical fitness abilities, including speed, agility, and quickness. As such, change of direction (COD) skills of the individual player can be considered an important sub-component of over-all physical performance capacity.  The ability to change direction multiple times at high speed is believed to be an independent measure of performance, and  improvement in straight line sprinting speed does not appear to transfer to COD performance (Young et al., 2001). With some few exceptions (e.g. the T-test), the vast majority of COD tests are comprised of a forward directed movement pattern.. Therefore, there is a need for a multi-directional COD-test which makes it possible to evaluate COD skills including the discrete movement pattern transition  from fast forward to fast backwards running.     PURPOSE:  To develop and evaluate a COD-test involving multiple transitions from forward to backward high-speed movements in elite football players. Furthermore, to examine whether the COD-test can differentiate players competing at different performance levels.     .                     Thomas Rostgaard1, Lars Raundahl Rasmussen1,2, Peder Siggaard1,3, Thomas P. Gunnarsson1, and Jens Bangsbo1  Affiliations: 1 Department of Exercise and Sport Sciences, University of Copenhagen, Copenhagen, Denmark 2 Aarhus GF, Aarhus, Denmark 3 Brondby IF, Copenhagen, Denmark Fig. 1: Set-up and administration of the COD test can  be followed as a video sequence. Scan the Quick Response Code (QRC) or log on to http://www.youtube.com/watch?v=ZVQqpPhatUI   COD test performance (s)6,0 6,2 6,4 6,6 6,8 7,0 7,2COD retest performance (s)6,06,26,46,66,87,07,27,4CV = 1.1% X = YMETHODS:  Fifteen youth elite (YE) football players (age: 18.2±0.2 yrs) and 16 adult elite (AE) football players (24.0±1.3 yrs) completed three attempts on a COD-test consisting of multiple stopping maneuvers, transitions from forwards to backward running, and acceleration over short distances (< 5 m).This test replicates a series of movements often to be found during match play, and can be considered a football specific COD test. Also, the players carried out three straight 30-m sprints separated by 2 min of passive rest. Infrared light sensors were used to determine COD-performance, and running time after 5, 10, and 30 m. On a separate occasion the reproducibility of the COD-test was evaluated in the YE group (N=10). Coefficient of Variation (CV) was calculated as the standard deviation of repeated measures divided by the mean times 100. TEST SET-UP:                                     Fig. 2: Set-up of the COD test used in the present study (Raundahl’s Agility Test) (please consult fig. 2 for administration of the test). 3.0 m 4.5 m 2.0 m 6.5 m START FINISH LINE Fig. 4:  Test-retest reproducibility of the COD test. The correlation coefficient was 0.91 (N = 10, P < 0.05). Full line is the identity line (x = y). YE players AE playersCOD test performance (s)0,05,05,56,06,57,07,58,0*Fig. 3: COD performance in youth elite  (YE) and adult elite (AE) football players. * denotes significant difference between players competing at the two levels(p < 0.05).  5 m    10 m    30 m   Adult Elite (AE) players  0.88 ± 0.01  1.58  ± 0.02  3.97  ± 0.03  Youth Elite (YE) players 0.89 ± 0.02 1.60 ± 0.02 3.95 ± 0.03   Significance NS   NS   NS  AE COD Performance -0.04 (0.90) -0.08 (0.77) 0.11 (0.69)  YE COD Performance -0.22 (0.45) 0.06 (0.84) 0.30 (0.32)           Tab. 1:  Comparison of sprint performance (s) in different levels of elite football players (upper panel). Numbers are mean ± SEM ; Correlation matrix (lower panel) between sprint performance and COD ability(s). Numbers are Pearson’s r (p value). Level of significance; p < 0.05. CONTACT: Thomas Rostgaard, The August Krogh Institute, Universitetsparken 13 - 2nd floor (#204) – 2100 Copenhagen, Denmark. E-mail: trandersen@ifi.ku.dk 

Change of direction skills in elite football players in relation to speed qualities and competitive level

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Change of direction skills in elite football players in relation to speed qualities and competitive level

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