"THE LONGITUDINAL EFFECTS OF RESISTED SPRINT TRAINING USING WEIGHTED SLEDS vS. WEIGHTED VESTS"- JSCR, 12-10.
Granted it was a small study-only 20 participants, and they were lacrosse-not track athletes, and the study only lasted 7 weeks.
The results showed sprint training with a weighted vest or sled pulls did not improve performance in the short sprints. Our old track coach, the great Dave Costello claimed all resisted running, including parachute running, had limited value. He would use it sparingly- only on his regional/national caliber sprinters. He said while it looked like running, the mechanics were different and had little carry over.
Not to say it doesn't have a benefit. If you play a sport like football or Rugby where people are hanging on you or pushing you I could see it being purposeful. Would you use it to compliment shot put, discus, javelin, hammer throw?