Fitness profiles of professional soccer players before and after pre-season conditioning
This chapter investigates the effects of a fatigue task on Peak Torque (PT) and Angle-Relativised Torque (ART) indices of isokinetic knee extension and flexion strength in female collegiate soccer players. It also represents a preliminary examination of a conceptual model for selected aspects of knee joint dynamic stability. The fatigue task comprised 30 reciprocal maximal voluntary actions of the knee extensors and flexors of the preferred limb. The chapter suggests that a fatigue task reduces the capacity of the knee extensors and flexors to generate force by 20" to 60" during concentric muscle actions. The reduction in strength is evidenced by the index of peak torque and indices of angle-relativised torque near to the extremes of the range of motion. Heavy-resistance strength conditioning may represent an optimal intervention in soccer players since it would be expected to increase directly the maximal joint stabilising capacity of the knee flexor muscle groups and improve concomitantly the capacity for muscular endurance.