Abstract
1694 V-2 ski-skating is used extensively in biathlon skiing on flat and gradual uphill terrain. This technique requires a double pole plant for each stride within a cycle. In spite of the wide spread use of V-2 in biathlon, cross-country and nordic combined skiing events, no detailed biomechanical analysis has been done. The purpose of this study was to define characteristics of the V-2 technique on an 8% slope during actual competition. Male biathletes (N=62) were video taped at 30 Hz during the 10 km sprint race. A 24-point digitizing model was utilized in analyzing 15 biathletes for the 2nd lap (of 3). Subjects were selected as representative of race finish and included 3 of 4 U.S. biathletes. Variables selected for analysis included: CM measures (cycle velocity, length, & rate), temporal measures (pole & ski contact time), and body segment angles (shoulder, elbow, & knee). Cycle velocity was related to race velocity and cycle length but not cycle rate (r=0.81, 0.81, and 0.21, respectively, p<0.05). Correlations between poling time (34% of cycle time) and cycle velocity and cycle length were −0.85 and −0.87 (p<0.05). Average single ski contact was 60% of total cycle time with double support 20% of cycle time. Cycle velocity correlated with elbow and knee ROM (r=−0.71 and 0.55, p<0.05) but not shoulder ROM (r=0.44). These data show that faster skiers have shorter poling times with constant elbow angles during the power phase of poling and suggest that the upper body component is important in V-2 ski-skating. Supported by the United States Olympic Committee
Published Version
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