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Factors influencing the performance of young football players in the yo-yo intermittent endurance test (Level 2)

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Brito J., Fernandes L., Seabra A., Rebelo A.

Biomedical Human Kinetics

2010

vol. 2

51-53

Study aim: To find out whether the ability to accelerate, decelerate and turn may contribute to the performance of young football players during the Yo-Yo Intermittent Endurance Test - Level 2 (YYIEL2).Material and methods: A group of 239 young male football players from three age categories: under 15 years (U15; n = 102), under 17 years (U17; n = 59) and under 19 years (U19; n = 74) were evaluated in sprint, agility, and intermittent exercise performance. Multiple regression models weighted for maturity status were applied.Results: Significant (p<0.001) differences were found between the U15 and both other groups in all tests. The YYIEL2 was significantly correlated with 5-m and 30-m sprints and agility (r = 0.361, 0.499 and 0.555, respectively; p<0.001) and the latter 3 variables explained 31% (p<0.001) of the total variance of the YYIEL2 performance, the agility test alone being the strongest predictor (b = 0.56; p<0.001).Conclusions: Despite the usefulness of the YYIEL2 test used in football to determine aerobic fitness, other factors than O2max, such as peripheral limitations and the ability to accelerate, decelerate and turn, may influence the performance during the test.

Short-Term Performance Effects of Three Different Low-Volume Strength-Training Programmes in College Male Soccer Players

88%

Brito J., Vasconcellos F., Oliveira J., Krustrup P., Rebelo A.

Journal of Human Kinetics

2014

vol. 40

issue 1

121-128

This study aimed to analyse the short-term performance effects of three in-season low-volume strength-training programmes in college male soccer players. Fifty-seven male college soccer players (age: 20.3 [...] 1.6 years) were randomly assigned to a resistance-training group (n=12), plyometric training group (n=12), complex training group (n=12), or a control group (n=21). In the mid-season, players underwent a 9-week strength-training programme, with two 20 min training sessions per week. Short-term effects on strength, sprint, agility, and vertical jump abilities were measured. All training groups increased 1-RM squat (range, 17.2-24.2%), plantar flexion (29.1-39.6%), and knee extension (0.5- 22.2%) strength compared with the control group (p<0.05). The resistance-training group increased concentric peak torque of the knee extensor muscles by 9.9-13.7%, and changes were greater compared with the control group (p<0.05). The complex training group presented major increments (11.7%) in eccentric peak torque of the knee flexor muscles on the non-dominant limb compared with the control group and plyometric training group (p<0.05). All training groups improved 20-m sprint performance by 4.6-6.2% (p<0.001) compared with the control group. No differences were observed in 5-m sprint and agility performances (p>0.05). Overall, the results suggest that in-season low-volume strength training is adequate for developing strength and speed in soccer players.

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1 Biomedical Human Kinetics

1 Journal of Human Kinetics

1 2014

1 2010

2 Brito J.

2 Rebelo A.

1 Fernandes L.

1 Krustrup P.

1 Oliveira J.

1 Seabra A.

1 Vasconcellos F.

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Factors influencing the performance of young football players in the yo-yo intermittent endurance test (Level 2)

Short-Term Performance Effects of Three Different Low-Volume Strength-Training Programmes in College Male Soccer Players