A1 Journal article (refereed)
Muscle-Tendon Interaction During Human Dolphin-Kick Swimming (2019)

Sano, K., Sakamoto, T., Nishimura, R., Danno, Y., Komi, P. V., & Ishikawa, M. (2019). Muscle-Tendon Interaction During Human Dolphin-Kick Swimming. Frontiers in Physiology, 10, Article 1153. https://doi.org/10.3389/fphys.2019.01153

JYU authors or editors

Publication details

All authors or editors: Sano, Kanae; Sakamoto, Takumi; Nishimura, Ryoma; Danno, Yoshito; Komi, Paavo V.; Ishikawa, Masaki

Journal or series: Frontiers in Physiology

eISSN: 1664-042X

Publication year: 2019

Volume: 10

Article number: 1153

Publisher: Frontiers Media

Publication country: Switzerland

Publication language: English

DOI: https://doi.org/10.3389/fphys.2019.01153

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65823


Without high impact forces, it is not clear how humans can utilize tendon elasticity during low-impact activities. The purpose of the present study was to examine the muscle-tendon behavior together with the electromyographic (EMG) activities of the vastus lateralis (VL) muscle during the human dolphin-kicking. In a swimming pool, each subject (n = 11) swam the 25 m dolphin-kicking at two different speeds (NORMAL and FAST). Surface EMGs were recorded from the VL and biceps femoris (BF) muscles. Simultaneous recordings of the knee joint angle by electro-goniometer and of the VL fascicle length by ultrasonography were used to calculate the muscle-tendon unit and tendinous length of VL(L-MTU and L-TT, respectively). In the dolphin-kicking, the stretching and shortening amplitudes of VL L-MTU did not differ significantly between the two kicking speed conditions. However, both stretching and shortening amplitudes of the VL fascicle length were lower at FAST than at NORMAL speed whereas the opposite was found for the VL L-TT values. At FAST, the contribution of the VLfascicle length to the entire VLMTU length changes increased. The EMG analysis revealed at FAST higher agonist VL activation from the late up-beat (MTU stretching) to the early down-beat phases as well as increased muscle co-activation of VL and BF muscles from the late down-beat to early up-beat phases of dolphin-kicking. These results suggest that at increasing kicking speeds, the VL fascicles and tendinous tissues during aquatic movements can utilize tendon elasticity in a similar way than in terrestrial forms of locomotion. However, these activation profiles of VL and BF muscles may differ from their activation pattern in terrestrial locomotion.

Keywords: biomechanics; swimming; muscles; electromyography; ultrasonography

Free keywords: ultrasonography; vastus lateralis; electromyography; muscle fascicle; swim

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 1

Last updated on 2023-10-01 at 14:42