Alonso began rhythmic gymnastics at the Club Vallisoletano. In October 1989, she was invited by Emilia Boneva to join the national rhythmic gymnastics team of Spain, of which she would be a part until 1992.
During the time in which she was a member of the group, she would train about 8 hours a day at the Moscardó Gymnasium in Madrid under the direction of Boneva herself along with that of Ana Roncero, who since 1982 had been national group coach and head coach. She would also live with all the members of the team in a house in La Moraleja. She was a substitute gymnast for the team at most competitions during that time, although she participated in some exhibitions in Spanish cities during the preseason and competed in international tournaments such as Karlsruhe.[2]
In 1990, Alonso would not travel to any competitions but would remain in Madrid to train. Of the four substitutes in the group that year, only two could travel to a competition. The starting team that year was Beatriz Barral, Lorea Elso, Teresa Fuster, Montserrat Martín, Arancha Marty and Vanesa Muñiz, with Marta Aberturas and Gemma Royo as substitutes. Cristina Chapuli was also part of the team, but like Alonso, she was not entered into any competitions that year.[3]
In 1991, the two exercises for groups were 6 ribbons for the single-apparatus exercise and 3 balls and 3 ropes for the mixed-apparatus one. Their ribbon exercise used "Tango Jalousie", composed by Jacob Gade, for the music, while their mixed-apparatus one used the song "Campanas" by Víctor Bombi.[4] To choreograph the dance steps of the 6 ribbons exercise, they had the help of Javier "Poty" Castillo, then a dancer with the National Ballet, although the team's usual choreographer was the Bulgarian Georgi Neykov. Prior to the World Cup, they won gold at the Karlsruhe tournament (ahead of the USSR and Bulgaria) and three bronzes at the Gymnastic Masters in Stuttgart, both in Germany.[5]
On October 12 of that year, the Spanish group won the gold medal in the all-around of the World Championship in Athens. This medal was described by the media as historic, since it was the first time that Spain had won the World Championships in rhythmic gymnastics. On the first day of the all-around, they achieved a score of 19.500 in the exercise with 3 balls and 3 ropes, while on the following day, with their 6 ribbons performance, they obtained a mark of 19.350 (9.90 in composition and 9.45 for execution). With a total score of 38.850, the Spanish team managed to beat the USSR team by 50 thousandths, while North Korea won bronze. The next day, they would also be silver medalists in the two apparatus finals, the 6 ribbon and the 3 balls and 3 ropes finals.
Alonso won these medals together with Lorea Elso, Bito Fuster, Isabel Gómez, Montse Martín and Gemma Royo, with Cristina Chapuli and Marta Aberturas as the group's substitutes.[6][7][8] The winning of these would be narrated for Spain through La 2 de TVE by the journalist Paloma del Río. After this achievement, at the end of 1991 they would tour Switzerland.[9][10][11][12]
In 1992 they won silver in a tournament in Karlsruhe, and later they were invited to give an exhibition at one in Corbeil-Essonnes. In June, with new exercises, they participated in the European Championships in Stuttgart, where they shared the gold medal in the all-around with the Russian team, in addition to winning another gold in the 3 balls and 3 ropes final and bronze in 6 ribbons.[13][14][15] The group was made up of Alonso, Lorea Elso, Bito Fuster, Isabel Gómez, Montse Martín and Gemma Royo, with the new members Alicia Martín and Cristina Martínez as the substitutes. As rhythmic gymnastics groups were not able to participate in the Olympics at that time, she did not compete at the 1992 Summer Olympics. However, she participated with the rest of her teammates in the opening ceremony, leading the parade of the participating nations.
Shortly after, they won gold at both the Asvo Cup in Austria and the Alfred Vogel Cup in the Netherlands, where they also won silver in 6 ribbons and gold in 3 balls and 3 ropes. Gómez and Fuster were injured before the World Championships in Brussels, which took place in November 1992. They were kept on the team as substitutes, but in the competing lineup were replaced by Alicia Martín, Cristina Martínez and Bárbara Plaza. In this competition, the team won silver in the all-around, with their score just one tenth of a point away from allowing them to retain the world title they had won the previous year. In addition, on November 22 they won bronze in the 6 ribbons final and were 8th with 3 balls and 3 ropes. After this Débora, retired from competitions, as would the rest of the group that had been world champions in Athens in 1991.[16][17]
After her retirement, she began to teach physical condition, aerobics, ballroom dancing and rhythmic gymnastics in the town of Cervera de Pisuerga, where she lives with her family.
Spain 
Spain 
