Biomechanical and energetic determinants of technique selection in classical cross-country skiing

详细信息    查看全文

• 作者：Barbara Pellegrini ; Chiara Zoppirolli ; Lorenzo Bortolan ; Hans-Christer Holmberg ; Paola Zamparo ; Federico Schena
• 关键词：2300 ; 2330
• 刊名：Human Movement Science
• 出版年：December, 2013
• 年：2013
• 卷：32
• 期：6
• 页码：1415-1429
• 全文大小：1505 K

文摘

Classical cross-country skiing can be performed using three main techniques: diagonal stride (DS), double poling (DP), and double poling with kick (DK). Similar to other forms of human and animal gait, it is currently unclear whether technique selection occurs to minimize metabolic cost or to keep some mechanical factors below a given threshold. The aim of this study was to find the determinants of technique selection. Ten male athletes roller skied on a treadmill at different slopes (from 0掳 to 7掳 at 10 km/h) and speeds (from 6 to 18 km/h at 2掳). The technique preferred by skiers was gathered for every proposed condition. Biomechanical parameters and metabolic cost were then measured for each condition and technique. Skiers preferred DP for skiing on the flat and they transitioned to DK and then to DS with increasing slope steepness, when increasing speed all skiers preferred DP. Data suggested that selections mainly occur to remain below a threshold of poling force. Second, critically low values of leg thrust time may limit the use of leg-based techniques at high speeds. A small role has been identified for the metabolic cost of locomotion, which determined the selection of DP for flat skiing.