Effects of single-leg foot-landing techniques on ground reaction force and electromyography

Anterior Cruciate Ligament (ACL) injury has deleterious consequences on athletes both psychologically and financially. As the worldwide prevalence of ACL injury remains high today, developing prevention strategies is essential. The study aimed to examine the effects of foot-landing techniques on ver...

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Main Author: Bai, Jinhao
Other Authors: National Institute of Education
Format: Final Year Project
Language:English
Published: 2014
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Online Access:http://hdl.handle.net/10356/59161
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-591612020-09-27T20:22:22Z Effects of single-leg foot-landing techniques on ground reaction force and electromyography Bai, Jinhao National Institute of Education Kong Pui Wah DRNTU::Science::Biological sciences::Human anatomy and physiology::Human anatomy Anterior Cruciate Ligament (ACL) injury has deleterious consequences on athletes both psychologically and financially. As the worldwide prevalence of ACL injury remains high today, developing prevention strategies is essential. The study aimed to examine the effects of foot-landing techniques on vertical ground reaction force (vGRF) and electromyographic (EMG) activities of the lower extremity during single-leg drop-landings. It was hypothesized that forefoot landing would result in lower vGRF and higher muscular activities of medial gastrocnemius (MG) and soleus as compared with flat-foot landing. Fifteen male basketball athletes (age = 23.6 ± 1.9 years, height = 175.4 ± 8.0 cm, mass = 68.4 ± 10.0 kg) with no previous surgery and existing injury on the lower extremity were each tasked to perform single-leg drop-landings from a 30 cm platform onto a force plate using three different foot techniques (self-preferred, forefoot, flat-foot). Kinematics, vGRF and EMG data were recorded. Values of EMG were separated into two sets of averaged data (landing phase, pre-landing phase). Flat-foot landing produced a significantly higher peak vGRF compared to self-preferred and flat-foot landings (p < .001). There were significant main effects in MG between different foot-landing techniques (p = .002) and between different phases of landing (p = .037). Significant interactions were observed between foot-landing technique and phase of landing in MG (p = .035), as well as in soleus (p = .031). These results demonstrate that forefoot landing technique can effectively activate calf muscles and lower vGRF, hence mitigating the possible risk of non-contact ACL injury. Bachelor of Science (Sport Science and Management) 2014-04-24T08:24:35Z 2014-04-24T08:24:35Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/59161 en 49 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Science::Biological sciences::Human anatomy and physiology::Human anatomy
spellingShingle DRNTU::Science::Biological sciences::Human anatomy and physiology::Human anatomy
Bai, Jinhao
Effects of single-leg foot-landing techniques on ground reaction force and electromyography
description Anterior Cruciate Ligament (ACL) injury has deleterious consequences on athletes both psychologically and financially. As the worldwide prevalence of ACL injury remains high today, developing prevention strategies is essential. The study aimed to examine the effects of foot-landing techniques on vertical ground reaction force (vGRF) and electromyographic (EMG) activities of the lower extremity during single-leg drop-landings. It was hypothesized that forefoot landing would result in lower vGRF and higher muscular activities of medial gastrocnemius (MG) and soleus as compared with flat-foot landing. Fifteen male basketball athletes (age = 23.6 ± 1.9 years, height = 175.4 ± 8.0 cm, mass = 68.4 ± 10.0 kg) with no previous surgery and existing injury on the lower extremity were each tasked to perform single-leg drop-landings from a 30 cm platform onto a force plate using three different foot techniques (self-preferred, forefoot, flat-foot). Kinematics, vGRF and EMG data were recorded. Values of EMG were separated into two sets of averaged data (landing phase, pre-landing phase). Flat-foot landing produced a significantly higher peak vGRF compared to self-preferred and flat-foot landings (p < .001). There were significant main effects in MG between different foot-landing techniques (p = .002) and between different phases of landing (p = .037). Significant interactions were observed between foot-landing technique and phase of landing in MG (p = .035), as well as in soleus (p = .031). These results demonstrate that forefoot landing technique can effectively activate calf muscles and lower vGRF, hence mitigating the possible risk of non-contact ACL injury.
author2 National Institute of Education
author_facet National Institute of Education
Bai, Jinhao
format Final Year Project
author Bai, Jinhao
author_sort Bai, Jinhao
title Effects of single-leg foot-landing techniques on ground reaction force and electromyography
title_short Effects of single-leg foot-landing techniques on ground reaction force and electromyography
title_full Effects of single-leg foot-landing techniques on ground reaction force and electromyography
title_fullStr Effects of single-leg foot-landing techniques on ground reaction force and electromyography
title_full_unstemmed Effects of single-leg foot-landing techniques on ground reaction force and electromyography
title_sort effects of single-leg foot-landing techniques on ground reaction force and electromyography
publishDate 2014
url http://hdl.handle.net/10356/59161
_version_ 1681057695831949312