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Ann Appl Sport Sci 2024, 12(1): 0-0 |
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Vuk S, Pentek K, Damjan B. The Effect of Concurrent Ankle and Hip Positions on Hamstring Function in Athletes. Ann Appl Sport Sci 2024; 12 (1)
URL: http://aassjournal.com/article-1-1232-en.html
URL: http://aassjournal.com/article-1-1232-en.html
1- Laboratory for Motor Control and Performance, Department of Kinesiology of Sports, Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia. , sasa.vuk@kif.hr
2- Laboratory for Motor Control and Performance, Department of Kinesiology of Sports, Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
2- Laboratory for Motor Control and Performance, Department of Kinesiology of Sports, Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
Abstract: (1363 Views)
Background. Previous studies have suggested that ankle position and hip position can influence hamstring strength, but none have considered the influence of both joint positions at the same time.
Objectives. This study aimed to investigate the effect of ankle and hip position on peak torque (PT), normalized PT (NPT), angle of PT (APT), and surface electromyographic (SEMG) activity during isokinetic knee flexion.
Methods. In this within-subject study design, thirteen physically active men in a single session performed three maximal isokinetic unilateral knee flexion repetitions in four different ankle and hip positions: sitting with dorsal/plantar flexion and supine with dorsal/plantar flexion at two angular velocities of 60 and 180°/s on the isokinetic dynamometer. The individual SEMG activity of the gastrocnemius (GL), biceps femoris (BFl), and semitendinosus (ST) muscles was detected using a wireless SEMG system.
Results. Ankle and hip positions had a significant impact on the PT, NPT, and APT (p < 0.05), but did not affect SEMG activity of BFl, ST, and GL muscles for both angular velocities (p > 0.109). Specifically, the flexed hip and dorsiflexed ankle provided the greatest torque production, while the extended hip and plantarflexed ankle led to a decrease in hamstring torque production. An increase in angular velocity also led to an increase in APT.
Conclusion. Both hip and ankle positions have a significant impact on the PT, NPT, and APT, but not on BFl, ST, and GL activation during maximal knee flexion, for both angular velocities, 60 and 180°/s.
Objectives. This study aimed to investigate the effect of ankle and hip position on peak torque (PT), normalized PT (NPT), angle of PT (APT), and surface electromyographic (SEMG) activity during isokinetic knee flexion.
Methods. In this within-subject study design, thirteen physically active men in a single session performed three maximal isokinetic unilateral knee flexion repetitions in four different ankle and hip positions: sitting with dorsal/plantar flexion and supine with dorsal/plantar flexion at two angular velocities of 60 and 180°/s on the isokinetic dynamometer. The individual SEMG activity of the gastrocnemius (GL), biceps femoris (BFl), and semitendinosus (ST) muscles was detected using a wireless SEMG system.
Results. Ankle and hip positions had a significant impact on the PT, NPT, and APT (p < 0.05), but did not affect SEMG activity of BFl, ST, and GL muscles for both angular velocities (p > 0.109). Specifically, the flexed hip and dorsiflexed ankle provided the greatest torque production, while the extended hip and plantarflexed ankle led to a decrease in hamstring torque production. An increase in angular velocity also led to an increase in APT.
Conclusion. Both hip and ankle positions have a significant impact on the PT, NPT, and APT, but not on BFl, ST, and GL activation during maximal knee flexion, for both angular velocities, 60 and 180°/s.
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APPLICABLE REMARKS
APPLICABLE REMARKS
- The highest knee flexion torque can be produced in a flexed hip position with a dorsiflexed ankle, while the smallest torque is produced in a flexed hip position with a plantar flexed ankle.
- The isolation of the hamstrings can be achieved by reducing the influence of the gastrocnemius by placing the ankle in a plantar flexion position.
Type of Study: Original Article |
Subject:
Sport Biomechanics and its related branches
Received: 2023/07/15 | Accepted: 2023/09/2
Received: 2023/07/15 | Accepted: 2023/09/2
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