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A quadriceps femoris motor pattern for efficient cycling.

Gernot O Hering1, Raphael Bertschinger1, Jens Stepan1,2

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Highly trained cyclists exhibit distinct rectus femoris (RF) and vastus lateralis (VL) muscle activation patterns. This neuromuscular adaptation enhances force transmission and improves performance during high-intensity cycling.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Neuromuscular Physiology

Background:

  • Cycling propulsion relies on lower limb and hip muscles.
  • Previous research assumed better power transfer in trained cyclists but lacked detail on motor patterns.
  • Understanding specific muscle activation is key to differentiating performance levels.

Purpose of the Study:

  • To compare leg muscle activation between trained and highly trained cyclists.
  • To identify specific motor patterns associated with higher cycling performance.
  • To investigate the role of rectus femoris (RF) and vastus lateralis (VL) activation in power transfer.

Main Methods:

  • Electromyography (EMG) to measure muscle activation.
  • Lactate measurements to assess exercise intensity.
  • Bi-pedal/crank force measurements during maximal power, lactate threshold, and constant power tests.

Main Results:

  • Highly trained cyclists show strong rectus femoris (RF) activation during hip flexion, reducing negative force.
  • Pre-activation of RF during hip flexion minimizes force loss at the top dead center (TDC).
  • Higher performance correlates with earlier and more intense coactivation of RF and vastus lateralis (VL), optimizing force transmission.

Conclusions:

  • Specific quadriceps femoris recruitment patterns, particularly RF and VL coactivation, enhance cycling propulsion.
  • Neuromuscular adaptations in muscle activation contribute significantly to elite cycling performance.
  • Findings can inform training interventions for athletes and rehabilitation programs.