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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
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Changes in movement variability and task performance during a fatiguing repetitive pointing task.

Chen Yang1, Jason Bouffard2, Divya Srinivasan3

  • 1Department of Kinesiology and Physical Education, McGill University, Montreal, QC H2W 1S4, Canada; Occupational Biomechanics and Ergonomics Laboratory, Michael Feil and Ted Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, Laval, QC H7V 1R2, Canada.

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Fatigue increases variability in shoulder, elbow, and their coordination during pointing tasks. This increased variability may help maintain overall task performance despite muscle tiredness.

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Area of Science:

  • Neuromuscular control
  • Biomechanics
  • Motor learning

Background:

  • Neuromuscular strategies during fatigue in multi-joint movements are not well understood.
  • Fatigue increases joint-level motor variability in upper limb tasks, but inter-limb coordination changes remain unclear.

Purpose of the Study:

  • To investigate the effects of neck-shoulder fatigue on shoulder and elbow kinematic variability.
  • To assess changes in shoulder-elbow coordination and its variability during a forward pointing movement.
  • To evaluate the impact of fatigue on endpoint characteristics of the movement.

Main Methods:

  • Nineteen healthy adults performed a repetitive pointing task to volitional fatigue (Borg 8/10).
  • Continuous relative phase and statistical nonparametric mapping were used to analyze shoulder-elbow coordination.
  • Kinematic data of shoulder and elbow joints, and endpoint accuracy were recorded.

Main Results:

  • Muscle fatigue led to increased variability in shoulder abduction and elbow flexion.
  • Shoulder-elbow coordination variability increased throughout most of the movement cycle.
  • Despite increased joint and coordination variability, movement timing and endpoint spatial accuracy were largely preserved.

Conclusions:

  • Fatigue induces increased variability not only in the fatigued limb but also in the non-fatigued limb and inter-limb coordination.
  • Altered variability patterns with fatigue may serve to maintain overall task performance and goal achievement.