Drop punt kicking induces eccentric knee flexor weakness associated with reductions in hamstring electromyographic...

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Australian Football involves repetitive kicking actions, potentially impacting player strength and muscle activation.
• Understanding the neuromuscular consequences of kicking is crucial for injury prevention and performance optimization.

Purpose of the Study:

• To investigate the effects of 100 drop punt kicks on isokinetic knee flexor strength and hamstring muscle electromyography (EMG).
• To differentiate the impact on concentric versus eccentric strength and muscle activation.

Main Methods:

• A randomized controlled study involving 36 recreational footballers.
• Participants were assigned to either a kicking group (100 drop punts) or a control group (10 minutes sitting).
• Isokinetic dynamometry and surface EMG of biceps femoris and medial hamstrings were measured before and after the intervention.

Main Results:

• The kicking group showed significantly greater declines in eccentric knee flexor strength and hamstring EMG compared to the control group.
• Reductions in strength and EMG were more pronounced in eccentric actions than concentric actions post-kicking.
• Biceps femoris EMG reductions correlated with eccentric strength decline.

Conclusions:

• Repeated drop punt kicking primarily affects eccentric knee flexor strength and hamstring muscle activity.
• Training load management in Australian Football should account for the specific impact on eccentric muscle contractions.