His personal best in decathlon was 8627 points (1992), in Heptathlon 6228 points (1997), both former national records. Změlík's Olympic success was influential for two other Czech decathletes and world record holders, Tomáš Dvořák and Roman Šebrle.
He was a frequent competitor at the Hypo-Meeting in Götzis, Austria, participating in 1989, 1991, 1992, 1993 and 1995. He made the podium for the first time in the 1991 Hypo-Meeting, taking second place with a score of 8346 points, then had his first win at the 1992 Hypo-Meeting, where he set a career-best score.
