Age and task-dependent modulations in EMG-EMG coherence during gait: a scoping review

Area of Science:

• Neuroscience
• Biomechanics
• Human Movement Science

Background:

• Electromyography (EMG)-EMG coherence is a tool to study neural control of locomotion.
• Previous research on age and task effects on coherence lacks consensus.

Purpose of the Study:

• To systematically review literature on EMG-EMG coherence in healthy individuals across different ages and walking tasks.
• To identify consensus and gaps in current research.

Main Methods:

• A scoping review of six major databases (CINAHL, Cochrane Central, CDSR, MEDLINE, Embase, Web of Science).
• Inclusion of 31 studies involving 551 healthy individuals analyzing EMG-EMG coherence during locomotor tasks.

Main Results:

• A consensus emerged: EMG-EMG coherence decreases with aging, especially in Beta and Gamma frequency bands, likely due to corticospinal tract changes.
• Increased Beta and Gamma coherence was observed during challenging tasks (perturbations, obstacle negotiation), indicating greater cortical involvement in gait control.

Conclusions:

• Aging is associated with reduced intermuscular coordination during walking.
• Complex locomotor tasks necessitate enhanced cortical processing for effective gait control.
• Future research should explore Alpha band coherence and investigate pediatric populations using standardized methods.