Supervisors info:
Τζιωρτζής Σ., Καθηγητής, ΤΕΦΑΑ, ΕΚΠΑ
Σμυρνιώτου Α., Αναπληρώτρια Καθηγήτρια, ΤΕΦΑΑ, ΕΚΠΑ
Παραδείσης Γ., Λέκτορας, ΤΕΦΑΑ, ΕΚΠΑ
Summary:
Purpose: The purpose of this study was to examine the effects of resisted and un-resisted sprint training programs on acceleration and maximum speed performance.
Method: 16 sprint athletes (12 men, 4 female, age 25±4 years, height 72±0,08m and weight 61,5±10,6kg completed a resisted (n=8) and an un-resisted (n=8) sprint training program. The resisted group followed the program towing a large size chute and the un-resisted group followed a similar sprint training program without resistance. The training program consisted of 4x30m and 4x50m maximal runs, and was applied 3 times/week for 4 weeks. Two days before and two days after the training program the subjects performed a 50m run and the running velocity of 0-10m, 10-20m, 20-40m and 40-50m was measured. In addition stride length, stride rate, contact time and flight time were evaluated between the 1-7m during the acceleration phase and between 40-46m during the maximum speed phase.
Results: The resisted sprint training group improved running velocity in all sections of acceleration phase 0-10m (t= -2,722, p=0,03), 10-20μ (t= -3,153, p=0,016) and 0-20μ (t= -4,427, p=0,003), while un-resisted sprint training group in the run section 0-20m (t= -3,174, p=0,016). However, comparison between group on adjusted postraining mean indicated that running velocity was significantly higher during run section 0-20m in the resisted group compared to that of the un-resisted group (F1,12=5,307, p=0,04). For the maximum speed phase the resisted sprint training program improved running velocity in the 40-50m run section, while un-resisted sprint training had no effect in any run section in the maximum speed phase. Stride length increased after resisted (t= -2,367, p=0,05) and un-resisted sprint training (t= -2,074, p=0,077) in acceleration phase, whereas stride rate increased only after resisted sprint training (t= -2,062, p=0,078) in maximum speed phase.
Conclusions: Resisted sprint training with large size chute for 4 weeks significantly improves running velocity during acceleration phase by increasing stride length and during maximum speed phase by increasing stride rate in sprint athletes.
