Macro-Kinematic Differences Between Sprint and Distance Cross-Country Skiing Competitions Using the Classical...

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Cross-country skiing encompasses diverse events, including Sprint and Distance races, each with unique physiological and biomechanical demands.
• Understanding the macro-kinematic differences between these event types is crucial for optimizing training and performance strategies for elite athletes.
• Previous research has explored various aspects of cross-country skiing technique, but a direct comparison of sub-technique utilization and kinematics between Sprint and Distance events in elite female skiers is warranted.

Purpose of the Study:

• To compare the macro-kinematics of elite female cross-country skiers across Sprint and Distance classical technique events.
• To analyze the relative use, velocities, cycle lengths, and cycle rates of specific sub-techniques (double pole, kick-double pole, diagonal stride, tucking, turning) during both event types.
• To elucidate the performance demands and strategic differences between Sprint and Distance cross-country skiing competitions.

Main Methods:

• Six elite female cross-country skiers competed in 1.1-km Sprint and 10.5-km Distance classical technique races on consecutive days.
• A single micro-sensor unit worn by each skier monitored sub-technique use, velocity, cycle length, and cycle rate.
• Data were collected during Sprint qualification, semi-finals, finals, and multiple laps of the Distance race, focusing on a common 1.0-km track section.

Main Results:

• Mean race velocity and sub-technique cycle rates were higher during the Sprint compared to the Distance event.
• Kick-double pole (KDP) and diagonal stride (DS) velocities were significantly higher in the Sprint due to faster cycle rates and longer cycle lengths.
• Double pole (DP) velocity was higher in the Sprint with a faster cycle rate despite a shorter cycle length; tucking (Tuck) was the fastest sub-technique overall.

Conclusions:

• Significant differences exist in macro-kinematic characteristics and strategies employed by elite female skiers between Sprint and Distance classical events.
• Higher cycle rates are a key characteristic of Sprint cross-country skiing performance.
• The findings enhance the understanding of the specific performance demands inherent in Sprint versus Distance cross-country skiing competitions.