Key result
Copenhagen adduction exercise substantially increases adductor thickness and flexibility, but gains reverse after detraining.
Why the study?
Copenhagen adduction exercise increases adductor muscle strength, but its effects on adductor architectural characteristics and flexibility have been little studied.
Does Copenhagen adduction exercise improve muscle thickness and adductor flexibility in active subjects?
RCT (n=45)
Randomized
Does Copenhagen adduction exercise improve muscle thickness and adductor flexibility in active subjects?
Effect estimate: d = 1.77-1.82 (thickness), d = 0.94-0.96 (flexibility)
p-value: p=<0.001
8 weeks of Copenhagen adduction exercise significantly increases adductor muscle thickness and flexibility, which returns to baseline after 4 weeks of detraining.
Transient gains from Copenhagen adduction training warrant ongoing programs in active adults; confirms rapid detraining reversal and supports maintenance trials.
Groin injuries are one of the most prevalent in sports, especially due to the hip adductor muscles’ weakness, which is considered as a risk factor. The Copenhagen adduction exercise (CAE) has been demonstrated to increase the strength of adductor muscles, but its effects on the architectural characteristics and flexibility of the adductors has been little studied. The aim of the present study was to analyse the impact on the muscular architecture and flexibility of the adductor musculature after 8 weeks of CAE-based training and after 4 weeks of subsequent detraining. A sample of 45 active subjects (26.1 ± 2.8 years old) were randomly divided into a control group with no intervention and an experimental group with an intervention based on 8 weeks of CAE training and 4 weeks of subsequent detraining. The muscle thickness of adductors was measured before and after training and detraining using ultrasound imaging and hip abduction range with goniometry. A significant increase in muscle thickness (left leg: +17.83%, d = 1.77, p < 0.001//right leg: +18.38%, d = 1.82, p < 0.001) and adductor flexibility was found in the experimental group (left leg: +7.3%, d = 0.96, p < 0.05//right leg: +7.15%, d = 0.94, p < 0.05), and after detraining, both variables returned to their initial values. These results could indicate that CAE would be a suitable strategy to modify the architecture of the adductors and thus form part of training protocols designed for the prevention and rehabilitation of muscle injuries.
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Alonso-Fernández et al. (2022) conducted an RCT in Active subjects (n=45). Copenhagen adduction exercise (CAE) vs. No intervention was evaluated on Muscle thickness of adductors and hip abduction range (d = 1.77-1.82 (thickness), d = 0.94-0.96 (flexibility), p=<0.001). Eight weeks of Copenhagen adduction exercise significantly increased adductor muscle thickness (p<0.001) and flexibility (p<0.05), but these gains returned to baseline after 4 weeks of detraining.
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