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Titolo:
Stretch-shortening cycle in roller ski skating: Effects of technique
Autore:
Perrey, S; Millet, GY; Candau, R; Rouillon, JD;
Indirizzi:
UFR STAPS, Lab Sci Sport, F-25030 Besancon, France UFR STAPS Besancon France F-25030 ab Sci Sport, F-25030 Besancon, France
Titolo Testata:
INTERNATIONAL JOURNAL OF SPORTS MEDICINE
fascicolo: 8, volume: 19, anno: 1998,
pagine: 513 - 520
SICI:
0172-4622(199811)19:8<513:SCIRSS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MECHANICAL EFFICIENCY; SKELETAL-MUSCLE; COUNTRY; ENERGY; PRESTRETCH; RESPONSES; BEHAVIOR; EXERCISE;
Keywords:
cross-country skiing; roller ski skating; stretch-shortening cycle; joint kinematics; EMG;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Perrey, S UFR STAPS, Lab Sci Sport, Pl St Jacques, F-25030 Besancon, France UFR STAPS Pl St Jacques Besancon France F-25030 esancon, France
Citazione:
S. Perrey et al., "Stretch-shortening cycle in roller ski skating: Effects of technique", INT J SP M, 19(8), 1998, pp. 513-520

Abstract

The purposes of this study were 1) to examine the occurrence of the stretch-shortening cycle (SSC) in the three principal techniques of ski skating and 2) to test the hypothesis that differences in SSC behaviour may explain the choice of a technique when the grade is altered. Ten highly skilled male crosscountry skiers roller skied at 5.3 +/- 0.1 m . s(-1) using the V1 skate (V1), V2-alternate (V2A), and V2 skate (V2) techniques. Knee and ankle joint kinematics, EMG of the vastus lateralis (VL) and gastrocnemius lateralis (GL) muscles, and roller ski velocity were recorded during the last 40 s of each bout of roller skiing. The existence of an EMG signal during the eccentric phase prior to the thrust, as well as the lack of significant delay between the two phases, showed that SSC occurs in the three techniques of roller ski skating with the exception of 50% of the subjects at the weak side knee with V1. The VL stretching velocity over the eccentric phase was higher (p < 0.005) with V2 and V2A than V1, indicating that less elastic energy was stored in the lower limbs extensor muscles with V1. This could partly explain why this technique is not used on flat terrains during races. However, no differences of average EMG activity or IEMG existed between techniques for either GL or VL during the concentric phase, suggesting that thetheoretical advantage due to the SSC behaviour is minor in roller ski skating.

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Documento generato il 07/07/20 alle ore 06:24:48