Factors of force potentiation induced by stretch-shortening cycle in plantarflexors.
Muscle force is potentiated by countermovement; this phenomenon is called stretch-shortening cycle (SSC) effect. In this study, we examined the factors strongly related to SSC effect in vivo, focusing on tendon elongation, preactivation, and residual force enhancement. Twelve healthy men participate...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2015-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4451763?pdf=render |
| _version_ | 1817990205995483136 |
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| author | Atsuki Fukutani Toshiyuki Kurihara Tadao Isaka |
| author_facet | Atsuki Fukutani Toshiyuki Kurihara Tadao Isaka |
| author_sort | Atsuki Fukutani |
| collection | DOAJ |
| description | Muscle force is potentiated by countermovement; this phenomenon is called stretch-shortening cycle (SSC) effect. In this study, we examined the factors strongly related to SSC effect in vivo, focusing on tendon elongation, preactivation, and residual force enhancement. Twelve healthy men participated in this study. Ankle joint angle was passively moved by a dynamometer, with a range of motion from 15° dorsiflexion (DF) to 15° plantarflexion (PF). Muscle contraction was evoked by electrical stimulation, with stimulation timing adjusted to elicit three types of contraction: (1) concentric contraction without preliminary contraction (CON), (2) concentric contraction after preliminary eccentric contraction (ECC), and (3) concentric contraction after preliminary isometric contraction (ISO). Joint torque was recorded at DF5°, PF0°, and PF5°, respectively. SSC effect was calculated as the ratio of joint torque obtained in ECC or ISO with respect to that obtained in CON at the aforementioned three joint angles. SSC effect was prominent in the first half of movement in both ECC (DF5°, 329.3 ± 101.2%; PF0°, 159.2 ± 29.4%; PF5°, 125.5 ± 20.8%) and ISO (DF5°, 276.4 ± 87.0%; PF0°, 134.5 ± 24.5%; PF5°, 106.8 ± 18.0%) conditions. SSC effect was significantly larger in ECC than in ISO at all joint angles (P < 0.001). Even without preliminary eccentric contraction (i.e., ISO condition), SSC effect was clearly large, indicating that a significant part of SSC effect is derived from preactivation. However, the active lengthening-induced force potentiation mechanism (residual force enhancement) also contributes to SSC effect. |
| first_indexed | 2024-04-14T00:56:14Z |
| format | Article |
| id | doaj.art-5a60b287b98942b999734236ca0b316c |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-14T00:56:14Z |
| publishDate | 2015-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-5a60b287b98942b999734236ca0b316c2022-12-22T02:21:36ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01106e012057910.1371/journal.pone.0120579Factors of force potentiation induced by stretch-shortening cycle in plantarflexors.Atsuki FukutaniToshiyuki KuriharaTadao IsakaMuscle force is potentiated by countermovement; this phenomenon is called stretch-shortening cycle (SSC) effect. In this study, we examined the factors strongly related to SSC effect in vivo, focusing on tendon elongation, preactivation, and residual force enhancement. Twelve healthy men participated in this study. Ankle joint angle was passively moved by a dynamometer, with a range of motion from 15° dorsiflexion (DF) to 15° plantarflexion (PF). Muscle contraction was evoked by electrical stimulation, with stimulation timing adjusted to elicit three types of contraction: (1) concentric contraction without preliminary contraction (CON), (2) concentric contraction after preliminary eccentric contraction (ECC), and (3) concentric contraction after preliminary isometric contraction (ISO). Joint torque was recorded at DF5°, PF0°, and PF5°, respectively. SSC effect was calculated as the ratio of joint torque obtained in ECC or ISO with respect to that obtained in CON at the aforementioned three joint angles. SSC effect was prominent in the first half of movement in both ECC (DF5°, 329.3 ± 101.2%; PF0°, 159.2 ± 29.4%; PF5°, 125.5 ± 20.8%) and ISO (DF5°, 276.4 ± 87.0%; PF0°, 134.5 ± 24.5%; PF5°, 106.8 ± 18.0%) conditions. SSC effect was significantly larger in ECC than in ISO at all joint angles (P < 0.001). Even without preliminary eccentric contraction (i.e., ISO condition), SSC effect was clearly large, indicating that a significant part of SSC effect is derived from preactivation. However, the active lengthening-induced force potentiation mechanism (residual force enhancement) also contributes to SSC effect.http://europepmc.org/articles/PMC4451763?pdf=render |
| spellingShingle | Atsuki Fukutani Toshiyuki Kurihara Tadao Isaka Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. PLoS ONE |
| title | Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. |
| title_full | Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. |
| title_fullStr | Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. |
| title_full_unstemmed | Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. |
| title_short | Factors of force potentiation induced by stretch-shortening cycle in plantarflexors. |
| title_sort | factors of force potentiation induced by stretch shortening cycle in plantarflexors |
| url | http://europepmc.org/articles/PMC4451763?pdf=render |
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