| dc.description.abstract | This study observed the diagonal stride of cross-country
skiing cinematographically, to compare the effects of five
different pole lengths on the mechanics of the kick, glide
and pole implantation phases, The "preferred" pole length
was 35 cm. less than subjects (Ss)body height; the other
four pole lengths were 10 cm. longer, five cm. longer, five
cm. shorter and 10 cm. shorter than the "preferred" pole
length. All Ss used the same brand of ski equipment.
Thirteen male and female ranged in age from 20-36 yrs.,
and skied each of the five trials with a different pole
length. All trials were filmed at 150 frames per second and
analyzed against nine variables. A Single Factor Analysis
of Variance (ANOVA) with Repeated Measures followed by a
Bonferroni T test was used to analyze the following
variables: velocity, stride length, stride rate, trunk
flexion, trunk extension, angular displacement from trunk
flexion to trunk extension, lower leg angle at legs'
parallel position, pole plant displacement, and pole angle
at implantation. Significant differences (P<.05) created by
the various pole lengths were found in the absolute angle of
trunk flexion, the absolute trunk angle at trunk extension,
the horizontal displacement of the pole plant in relation to
the support foot, and the absolute pole angle at pole
implantation. No significant differences (P>.05) were found
in velocity, stride length, stride rate, angular
displacement from trunk flexion to trunk extension, or the
lower leg angle at legs parallel position. It was concluded
that specific pole lengths do have an effect on various
poling mechanics of the diagonal stride of cross-country
skiing. | en |
