Spatial muscle activation patterns during different leg exercise protocols in physically active adults using muscle...

Area of Science:

• Biomechanics
• Neuroscience
• Radiology

Background:

• Muscle activation patterns are crucial for understanding exercise physiology and rehabilitation.
• Muscle functional magnetic resonance imaging (mfMRI) is an emerging technique to visualize these patterns by detecting metabolic changes.
• Assessing lower limb and lumbar muscle activation using mfMRI can inform targeted training and recovery strategies.

Purpose of the Study:

• To systematically evaluate studies using mfMRI to determine muscle activation patterns in the lumbar or lower limb muscles of physically active adults post-exercise.
• To synthesize findings on muscle activation specific to different exercises and muscle groups.

Main Methods:

• Systematic electronic searches were conducted up to March 2020.
• Included studies utilized ≥1.5 Tesla MRI scanners to compare spatial muscle activation patterns.
• Seven studies focusing on hamstring, quadriceps, or extrinsic foot muscles met the inclusion criteria.

Main Results:

• mfMRI revealed differential hamstring activation in individuals with prior trauma.
• Asymptomatic individuals showed preferential semitendinosus activation.
• Specific exercises elicited distinct activation ratios in biceps femoris and rectus femoris muscles.

Conclusions:

• mfMRI demonstrates exercise-specific muscle activation patterns in lower limb muscles.
• Findings suggest that exercise specificity may be important for muscle rehabilitation, though current evidence is limited.
• Further research is needed to explore mfMRI applications in diverse populations and exercise modalities.