ArticleMedicine and science in sports and exercise2021
Changes in Biceps Femoris Long Head Fascicle Length after 10-d Bed Rest Assessed with Different Ultrasound Methods.
Article in Medicine and science in sports and exercise, 2021. 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, 27 citations in OpenAlex.
- Alterations to longitudinal muscle morphology and mechanical function following immobilization and recovery in female ovariectomized and intact rats.Experimental physiology · 2026Article
- Gastrocnemius medialis neuromechanics during cycling at various exercise intensities.Scientific reports · 2026Article
- Linear Extrapolation and Extended Field-of-View Methods of Biceps Femoris Long Head Regional Architecture.Exercise, sport & movement · 2026Article
- Does longer-muscle length resistance training cause greater longitudinal growth in humans? A systematic review.Sports medicine and health science · 2026Review
- Addressing the Paradox of Rest with Innovative Technologies.Zdravstveno varstvo · 2025Article
- The Structural Adaptations That Mediate Mechanical Load-Induced Changes in Muscle Mass.Advances in experimental medicine and biology · 2025Review
- Review
- Ultrasonographic measurements of fascicle length overestimate adaptations in serial sarcomere number.Experimental physiology · 2023Article
- Systematic Comparison of Muscle Ultrasound Thickness in Polyneuropathies and Other Neuromuscular Diseases.Neurology and therapy · 2023Article
- Physical Inactivity - the Human Health's Greatest Enemy.Zdravstveno varstvo · 2022Article
- Article
- ACSAuto-semi-automatic assessment of human vastus lateralis and rectus femoris cross-sectional area in ultrasound images.Scientific reports · 2021Article
- Implementing Ultrasound Imaging for the Assessment of Muscle and Tendon Properties in Elite Sports: Practical Aspects, Methodological Considerations and Future Directions.Sports medicine (Auckland, N.Z.) · 2021Review
- Stimuli for Adaptations in Muscle Length and the Length Range of Active Force Exertion-A Narrative Review.Frontiers in physiology · 2021Review
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Authors and funding
6 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThis study aimed to investigate the changes in fascicle length (Lf) of biceps femoris long head (BFlh) after 10 d of bed rest (BR) by comparing four different ultrasound (US) methods.
methodsTen healthy men participated in 10-d BR. Before (BR0) and after (BR10) the BR period, BFlh Lf values were obtained using 1) extended-field-of-view (EFOV) technique, 2) the manual linear extrapolation (MLE) method, and 3) two trigonometric equations (equations A and B) from a single US image.
resultsAfter BR10, decreased Lf values were observed by EFOV (P < 0.001; Hedges' g = 0.29) and MLE (P = 0.0082; g = 0.22) methods, but not with equations A and B. Differences between equation A and the other US methods were detected at both time points. The percentage of changes in Lf between BR0 and BR10 was influenced by the US methods applied, with difference detected between the changes measured by EFOV and the ones estimated by equation A (P = 0.04; g = 0.53). Bland-Altman analyses revealed relevant average absolute biases in Lf between EFOV and other methods at both time points (range BR0-BR10: MLE, 0.3-0.37 cm (3.4%-4.32%); equation B, 0.3-0.48 cm (3.24%-5.41%); equation A, 2.44-2.97 cm (24.05%-29.2%)). A significant correlation (r = 0.83) in percentage of change in Lf values was observed only between EFOV and MLE.
conclusionsWe showed that four distinct US methods lead to different results in the assessment of BFlh Lf changes after a short-term period of unloading. The implementation of EFOV technique (or alternatively MLE) to assess Lf changes in BFlh during longitudinal studies is warranted.
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