Differences in Strength, Speed, and Power Performance Between Visually Impaired Paralympic and Olympic Sprinters.

ABSTRACT

PURPOSE: To compare the strength, speed, and power performance of elite sprinters with and without visual impairment. METHODS: Twelve elite able-bodied sprinters and 15 Paralympic sprinters with visual impairment took part in this study. Sprinters from both groups performed the following tests squat and countermovement jumps, maximum bar-power output in the half-squat and jump-squat exercises, and 60-m sprint. The differences between groups in all variables examined were analyzed using the independent t test. RESULTS: Olympic sprinters revealed better performances in all tests when compared with Paralympic sprinters with visual impairment (effect sizes ranging from 1.29 to 9.04; P < .001). Differences of ∼32% and ∼20% were found for the half-squat and loaded and unloaded vertical jumps, respectively. Smaller differences (from ∼8% to ∼11%) were obtained in linear sprint performance. CONCLUSIONS: Between-groups differences peaked at low-velocity exercises (eg, âˆ¼32% in the half-squat) and decreased as movement velocity and specificity increased (eg, âˆ¼8% at 60-m sprint). Thus, the greatest differences between Olympic and Paralympic sprinters seem to be related to their ability to apply force at low movement velocities. Coaches are encouraged to work on all sprinting phases and across the entire force-velocity spectrum, bearing in mind that improvements in strength capacity will possibly lead to increased sprint performance in Paralympic sprinters with visual impairment, especially in the acceleration phase of sprinting.