200_DATABASE_blind.sav

The purpose of this study was to evaluate
the strength of the knee flexors and extensors and hip abductor and adductor
muscles in young soccer players. Twenty-three male under-19 soccer players participated
in this study (age: 17.7 ± 0.2 years; height: 173.0 ± 1.1 cm; body mass: 66.1 ±
1.3 kg). Body composition was measured using a bioelectrical impedance
(InBody770), and the dynamometry was performed by an isokinetic dynamometer
(Biodex System 3) for knee flexion and extension, and by an isometric
dynamometer (Smart Groin Trainer), for hip adduction and abduction. Comparisons were made between dominant
members (D) vs. non-dominant members (ND) and adductors vs. abductors (ADD:ABD) using the Wilcoxon test. There were statistically significant
differences in the peak torques between the dominant and non-dominant members
in the flexion function (Z = -4.198, p
< 0.01) and in the extension function (Z = -4.197, p
< 0.01) of the knee in concentric muscular action, and the flexion (Z = -4.198, p < 0.01) and in the extension (Z = -4.198, p < 0.01) of the knee in eccentric
muscular action. No statistically significant differences were obtained in the
conventional ratio (Z = -0.456, p
= 0.648) nor the functional ratio (Z = -0.335, p
= 0.738) between D and ND members. There were no statistically significant
differences between adductors and abductors at the moment of strength for absolute
values (N). The reference absolute and normalized to the weight values and the
ADD:ABD can be used as a guideline for classifying players in screening and
comparison in return tests to sports practice after an injury.

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