A US trends research firm has warned footwear companies that sports personalities are losing their appeal to youngsters, and that athletic shoes sales are falling as a whole in this sector because sports are losing their appeal for many young people.Zandl Group, a New York-based trends research firm, says, "We have seen a steady decline over the past several years of young people's involvement in sport, based on their description of a fun time and the people they would most like to meet.