摘要：Even though free throws account for approximately 20% of all points in a basketball game, practicing free throws is often not given enough attention. We analyse the efficiency of practicing free throws with a reduced diameter rim to monitor the changes of successful free throws and the changes of the angle of ball entry. Our sample included 57 top young basketball players, aged 15 to 18. After the experimental programme of practicing free throws, the efficiency of the free throws did not increase (neither during testing nor during competition) and neither did the angle of ball entry. The angle of entry with a standard and a reduced diameter rim are strongly correlated (r = 0.86) – most players retain their own shooting trajectory, regardless of the diameter of the rim. It seems that using a reduced diameter rim by itself, without instruction, does not lead to an increase of the angle of entry.
其他摘要：Čeprav s prostimi meti dosežemo približno 20 % vseh točk na košarkarski tekmi, se treningu prostih metov praviloma namenja premalo pozornosti. V pričujoči raziskavi smo se odločili analizirati učinkovitost treninga prostih metov s pomočjo obroča z zmanjšanim premerom (Ø = 37 cm) v smislu njegovega vpliva na učinkovitost (natančnost) zadevanja in vpadnega kota žoge pri metu na koš. V ta namen smo v vzorec merjencev vključili 57 mladih košarkarjev, starih od 15 do 18 let. Po končanem eksperimentalnem programu treninga prostih metov, se učinkovitost metov ni izboljšala (niti na posebej izvedenih testiranjih, niti na tekmi), prav tako pa se ni povečal vpadni kot žoge. Pokaže se visoka korelacija (r = 0.86) med vpadnim kotom žoge pri metih na običajni in zmanjšani obroč, kar pomeni, da se pri večini metov ohrani zelo podobna trajektorija leta žoge, ne glede na premer obroča. Očitno obroč z zmanjšanim premerom ne vpliva na vpadni kot žoge, če hkrati igralcem ne damo navodil naj povečajo izmetni kot žoge.
关键词：Basketball shooting; performance; angle of entry; technology
