Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing
Repeated high-impact ground forces can lead to injury and decreased performance. While increasing flexor hallucis longus (FHL) muscle activity is known to increase stiffness and elasticity, it is unknown if this also decreases ground reaction forces by shock absorption during landing. This study aim...
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| Format: | Article |
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MDPI AG
2021-06-01
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| Series: | Life |
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| Online Access: | https://www.mdpi.com/2075-1729/11/7/630 |
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| author | Kosuke Oku Daisuke Kimura Tomotaka Ito Akiyoshi Matsugi Tatsuya Sugioka Yusuke Kobayashi Hayato Satake Tsukasa Kumai |
| author_facet | Kosuke Oku Daisuke Kimura Tomotaka Ito Akiyoshi Matsugi Tatsuya Sugioka Yusuke Kobayashi Hayato Satake Tsukasa Kumai |
| author_sort | Kosuke Oku |
| collection | DOAJ |
| description | Repeated high-impact ground forces can lead to injury and decreased performance. While increasing flexor hallucis longus (FHL) muscle activity is known to increase stiffness and elasticity, it is unknown if this also decreases ground reaction forces by shock absorption during landing. This study aimed to determine whether increasing FHL muscle activity affects ground reaction force during landing in healthy subjects. Eight subjects performed single-leg steps onto a force platform for five trials, with and without flexion of the metatarsophalangeal (MTP) joint at the moment of landing. Integrated surface electromyography (sEMG) of the FHL and medial gastrocnemius (MG) and ground reaction forces (GRFs) were measured. sEMG and GRF during the 50 ms before and 100 ms following initial ground contact were analyzed and compared. Flexion of the MTP joint condition significantly decreased the vertical and mediolateral force peaks of GRF, and FHL muscle activity increased. Flexion of the MTP joint at the moment of landing reduces GRF in healthy subjects through force dissipation in the foot, by increased FHL muscle activity. The results suggest that this may contribute to injury prevention by reducing the impact force through flexing the MTP joint at the moment of landing. |
| first_indexed | 2024-03-09T04:47:18Z |
| format | Article |
| id | doaj.art-cdb677ce86f942d0b18cf4c47805cd48 |
| institution | Directory Open Access Journal |
| issn | 2075-1729 |
| language | English |
| last_indexed | 2024-03-09T04:47:18Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Life |
| spelling | doaj.art-cdb677ce86f942d0b18cf4c47805cd482023-12-03T13:14:39ZengMDPI AGLife2075-17292021-06-0111763010.3390/life11070630Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during LandingKosuke Oku0Daisuke Kimura1Tomotaka Ito2Akiyoshi Matsugi3Tatsuya Sugioka4Yusuke Kobayashi5Hayato Satake6Tsukasa Kumai7Department of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701-0193, JapanDepartment of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701-0193, JapanDepartment of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701-0193, JapanFaculty of Rehabilitation, Shijonawate Gakuen University, Daitou, Osaka 574-0011, JapanDivision of Rehabilitation, Hanna Central Hospital, Ikoma, Nara 630-0243, JapanDivision of Rehabilitation, Hanna Central Hospital, Ikoma, Nara 630-0243, JapanDivision of Rehabilitation, Hanna Central Hospital, Ikoma, Nara 630-0243, JapanFaculty of Sport Sciences, Waseda University, Tokorozawa, Saitama 359-1192, JapanRepeated high-impact ground forces can lead to injury and decreased performance. While increasing flexor hallucis longus (FHL) muscle activity is known to increase stiffness and elasticity, it is unknown if this also decreases ground reaction forces by shock absorption during landing. This study aimed to determine whether increasing FHL muscle activity affects ground reaction force during landing in healthy subjects. Eight subjects performed single-leg steps onto a force platform for five trials, with and without flexion of the metatarsophalangeal (MTP) joint at the moment of landing. Integrated surface electromyography (sEMG) of the FHL and medial gastrocnemius (MG) and ground reaction forces (GRFs) were measured. sEMG and GRF during the 50 ms before and 100 ms following initial ground contact were analyzed and compared. Flexion of the MTP joint condition significantly decreased the vertical and mediolateral force peaks of GRF, and FHL muscle activity increased. Flexion of the MTP joint at the moment of landing reduces GRF in healthy subjects through force dissipation in the foot, by increased FHL muscle activity. The results suggest that this may contribute to injury prevention by reducing the impact force through flexing the MTP joint at the moment of landing.https://www.mdpi.com/2075-1729/11/7/630big toemuscle contractionbiomechanicssurface electromyography |
| spellingShingle | Kosuke Oku Daisuke Kimura Tomotaka Ito Akiyoshi Matsugi Tatsuya Sugioka Yusuke Kobayashi Hayato Satake Tsukasa Kumai Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing Life big toe muscle contraction biomechanics surface electromyography |
| title | Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing |
| title_full | Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing |
| title_fullStr | Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing |
| title_full_unstemmed | Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing |
| title_short | Effect of Increased Flexor Hallucis Longus Muscle Activity on Ground Reaction Force during Landing |
| title_sort | effect of increased flexor hallucis longus muscle activity on ground reaction force during landing |
| topic | big toe muscle contraction biomechanics surface electromyography |
| url | https://www.mdpi.com/2075-1729/11/7/630 |
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