The effect of sitting position on double poling cycle characteristics, trunk control and physiology in sit-skier : a case study
Tekijät
Päivämäärä
2020Tekijänoikeudet
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
Introduction. Paralympic sit-skiing was introduced in Paralympics 1988. Since that, it has
been involved to International Paralympic Committee’s competitions (IPC). The athletes have
been divided into five different classes based on the level on impairment and loss of trunk
control. The classification is three-stepped process, where the level of the impairment and
trunk control of the athlete is evaluated. In cross-country sit-skiing, the athletes perform by
using double poling technique
Methods. In this case study, the subject was a Finnish 28-years old sit-skier, who is classified
to class LW11. The aim was to test the possible benefits of “kneeing” position with the
impaired subject who has performed in “knee-high” position. The measurements took four
days. During that time, the subject performed in both positions in maximal power output and
submaximal tests in ski ergometer as well as in maximal oxygen uptake test and two
anaerobic tests on treadmill. EMG, joint kinematics, cycle characteristics and blood lactate
were measured from each test. The respiratory variables were measured from submaximal
loads in ski ergometer and maximal tests on treadmill. Pole forces were measured from
maximal tests on treadmill.
Results. The main finding of this case study was that in the “kneeing” position, the subject
recorded longer time of exhaustion in maximal oxygen uptake test, higher maximal speed on
treadmill, longer time of exhaustion in anaerobic uphill test and higher maximal power (W) in
ski ergometer. There was no difference in VO2peak values, but B-Lapeak was clearly higher in
“kneeing” position in each test on treadmill. The trunk range of motion was limited in
“kneeing” position compared to “knee-high” position. Longer cycle time and lower cycle rate
were suggested to be the key patterns of double poling and connected with more economical
double poling performance in the maximal test and in both anaerobic tests.
Conclusion. The present results show that even for the athlete with limited trunk control, the
“kneeing “position can affect positively to sit-skiing performance. How this new sitting
position will work in the future and will the athlete due to the increased workload of the
erector spinae muscles be able to continue with the new position remains to be seen.
Nevertheless, based on this case study, we have now a protocol to test sit-skiing athletes, the
performance of them and the differences between the classes and the positions on a treadmill.
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