ArticlePhysiological reports2016
Behavior of human gastrocnemius muscle fascicles during ramped submaximal isometric contractions.
Article in Physiological reports, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed, 26 citations in OpenAlex.
- In vivo characterization of Achilles subtendon function and morphology within the tendon cross section and along the free tendon.Journal of applied physiology (Bethesda, Md. : 1985) · 2025Article
- A comparison of electromyography techniques: surface versus intramuscular recording.European journal of applied physiology · 2025Review
- Impact of contraction intensity and ankle joint angle on calf muscle fascicle length and pennation angle during isometric and dynamic contractions.Scientific reports · 2024Article
- Effect of different ankle joint positions on medial gastrocnemius muscle fiber strains during isometric plantarflexion.Scientific reports · 2023Article
- In Vivo Assessment of Shear Wave Propagation in Pennate Muscles Using an Automatic Ultrasound Probe Alignment System.IEEE open journal of engineering in medicine and biology · 2023Article
- Distribution of innervation zone and muscle fiber conduction velocity in the biceps brachii muscle.Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology · 2022Article
- Toward a wearable monitor of local muscle fatigue during electrical muscle stimulation using tissue Doppler imaging.Wearable technologies · 2022Article
- Mechanomyogram amplitude vs. isometric ankle plantarflexion torque of human medial gastrocnemius muscle at different ankle joint angles.Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology · 2021Article
- Stimulation TcPO2 Testing Improves Diagnosis of Peripheral Arterial Disease in Patients With Diabetic Foot.Frontiers in endocrinology · 2021Article
- Morphological changes in the long axis of the lower leg muscles during isometric contraction in the sitting position.Journal of physical therapy science · 2020Article
- History-dependence of muscle slack length in humans: effects of contraction intensity, stretch amplitude, and time.Journal of applied physiology (Bethesda, Md. : 1985) · 2020Article
- The Energy of Muscle Contraction. II. Transverse Compression and Work.Frontiers in physiology · 2020Article
- The Energy of Muscle Contraction. I. Tissue Force and Deformation During Fixed-End Contractions.Frontiers in physiology · 2020Article
- Behavior of human gastrocnemius muscle fascicles during ramped submaximal isometric contractions.Physiological reports · 2016Article
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Precise estimates of muscle architecture are necessary to understand and model muscle mechanics. The primary aim of this study was to estimate continuous changes in fascicle length and pennation angle in human gastrocnemius muscles during ramped plantar flexor contractions at two ankle angles. The secondary aim was to determine whether these changes differ between proximal and distal fascicles. Fifteen healthy subjects performed ramped contractions (0-25% MVC) as ultrasound images were recorded from the medial (MG, eight sites) and lateral (LG, six sites) gastrocnemius muscle with the ankle at 90° and 120° (larger angles correspond to shorter muscle lengths). In all subjects, fascicles progressively shortened with increasing torque. MG fascicles shortened 5.8 mm (11.1%) at 90° and 4.5 mm (12.1%) at 120°, whereas LG muscle fascicles shortened 5.1 mm (8.8%) at both ankle angles. MG pennation angle increased 1.4° at 90° and 4.9° at 120°, and LG pennation angle decreased 0.3° at 90° and increased 2.6° at 120°. Muscle architecture changes were similar in proximal and distal fascicles at both ankle angles. This is the first study to describe continuous changes in fascicle length and pennation angle in the human gastrocnemius muscle during ramped isometric contractions. Very similar changes occurred in proximal and distal muscle regions. These findings are relevant to studies modeling active muscle mechanics.
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