Sex-specific effects of fatigue on movement coordination during repetitive whole-limb tasks Flashcards
What is fatigue?
Disabling symptom in which physical and cognitive function is limited by interactions between performance fatigability and perceived fatigability
Fatigue can affect both physical and mental tasks.
Define motor variability.
Natural variations in postures, movements, and muscle activity observed to different extents in all tasks
Motor variability is an inherent characteristic of motor control.
What is muscle synergy?
Multimuscle coordination, low-dimensional modular control of muscle in groups
Muscle synergies allow for efficient movement patterns.
How does fatigue affect upper limb coordination?
Structures acting in synergy kept acting in synergy even after fatigue; the CNS organizes these synergies, and fatigue does not disrupt them
This indicates resilience in motor control despite fatigue.
What sex differences were observed in upper limb muscle activation before fatigue?
Males used more the anterior deltoid in shoulder stabilization; females used more the biceps during elbow flexion and extension as a response to fatigue
These differences highlight varying strategies for muscle engagement.
Describe the variability in muscle activation between males and females in upper limb tasks.
Females had more variable biceps activation and less variable activation of anterior deltoid
This suggests different stabilization strategies in response to fatigue.
What were the effects of fatigue on lower limb coordination for both sexes?
More in-phase and variable ankle-knee joint coordination pattern during early stance; less regular and more complex whole-body motion
Fatigue impacts coordination patterns significantly.
What sex differences were noted in lower limb fatigue effects?
Higher hip-pelvis coordination variability during loading stance phase in females; less smooth and rigid whole-body control strategy in females regardless of fatigue
Males had a focus on frontal plane thigh orientation.
What was the most important factor for males during lower limb fatigue?
Frontal plane thigh orientation was most important
This suggests a different focal point in coordination strategies.
What was more important for females during lower limb fatigue?
Sagittal plane hip angles were more important
This indicates a different approach to stability and movement in females.
What are implications of the research findings?
Personalization of sex-specific injury prevention and rehabilitation interventions; consider biological sex differences in software engineering for fatigue monitoring and performance analysis
Tailoring approaches can enhance effectiveness in rehabilitation.
What should be targeted in sex-specific injury prevention and rehabilitation interventions?
Target biceps, anterior deltoid, pelvis joint
This allows for more effective rehabilitation strategies.
What differences should be considered in software engineering for fatigue monitoring?
Personalized musculoskeletal model differs for males and females; coordination metrics differ
This ensures that monitoring systems are effective for both sexes.
