Stray Pedersen J.I, Magnussen R, Kuffel E. Seiler S.
Sling Exercise Training improves balance, kicking velocity and torso stabilization strength in elite soccer players.
Medicine & Science in Sport & Exercise 38(5):S243, 2006

Studie
12 norske førstedivisjonspillere i fotball deltok i intervensjonsgruppen. Intervensjonsgruppen trente slyngetrening i Redcord (tidligere kalt S-E-T) 2 ganger i uken over 8 uker. 9 spillere på samme nivå fungerte som kontrollgruppe. Spillerne som trente S-E-T hadde en signifikant forbedring i statisk balanse samt en økning i skuddstyrke. Det var ingen endringer hos kontrollgruppen. Dette er til vår viten det første studiet som dokumenterer at et ”core stabilitet” treningsprogram kan påvirke prestasjonsvariablene skuddstyrke og balanse blant fotballspillere. Det er foreløpig bare abstraktet som er publisert.

Abstract
Purpose: To determine the impact of a Sling Exercise Training (SET) core stability program on postural balance, kicking velocity, functional strength, and back pain in elite level soccer players.

Method: 12 Norwegian 1st division soccer players completed 8 wk x 2 d.wk-1 SET training with a main focus on the hip and trunk area. Each training session, athletes performed 8 different highly unstable, closed kinetic chain exercises in adjustable slings. Exercise difficulty was progressed by increasing the resistance arm and degree of instability. 4 of the training group had suffered extended periods of low back pain. 9 players of similar performance level served as a control group.

Results: Balance: Mean one-legged eyes closed COP sway velocity moment decreased 45 % in the worst leg (p < 0.01) and 18% in the best leg (p = 0.113). The mean difference in velocity moment between the legs was reduced from 51% to 3% (p=0.001). No change in balance performance was observed in the control group. Kicking: Ball velocity during one-step maximal velocity kicking (preferred leg) increased significantly in the training group (3.5%,) compared to controls (-2.3 %, p = 0,04). Torso functional strength: The 4 subjects with chronic low back all reported that pain was reduced after training. The training group, and particularly chronic low back pain subjects, significantly improved in a clinical test of pelvic rotational stability (p < 0.01, see picture of test condition).