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53. Acute effects of resistance training at different range of motions on plantar flexion mechanical properties and force.

Author

Murakami, Yuta, Konrad, Andreas, Kasahara, Kazuki, Yoshida, Riku, Warneke, Konstantin, Behm, David G, and Nakamura, Masatoshi

Subjects
*BIOMECHANICS, *EXERCISE physiology, *DATA analysis, *STRETCH (Physiology), *SKELETAL muscle, *RESEARCH funding, *CALF muscles, *DESCRIPTIVE statistics, *TORQUE, *RESISTANCE training, *STATISTICS, *PLANTARFLEXION, *ANKLE joint, *RANGE of motion of joints, *MUSCLE contraction
Abstract

The effects obtained from resistance training depend on the exercise range of motion (ROM) performed. We aimed to examine the acute effects of different exercise ROM resistance training on the plantar flexor muscles. Eighteen healthy untrained male adults participated in three conditions: calf raises in 1) partial condition [final (short muscle length) partial ROM], 2) full condition (full ROM), and 3) control condition. The ankle dorsiflexion (DF) ROM, passive torque at DF ROM, passive stiffness of muscle-tendon unit, and maximal voluntary isometric contraction (MVC-ISO) torque were measured before and immediately after the interventions. There were significant increases in DF ROM, passive torque at DF ROM, and a decrease in MVC-ISO, but no significant interaction in passive stiffness. Post hoc test, DF ROM demonstrated moderate magnitude increases in the full condition compared to the partial (p = 0.023, d = 0.74) and control (p = 0.003, d = 0.71) conditions. Passive torque at DF ROM also showed moderate magnitude increases in the full condition compared to the control condition (p = 0.016, d = 0.69). MVC-ISO had a moderate magnitude decrease in the full condition compared to the control condition (p = 0.018, d=−0.53). Resistance training in the full ROM acutely increases joint ROM to a greater extent than final partial ROM, most likely due to stretch tolerance. [ABSTRACT FROM AUTHOR]

Published
2024
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71. Muscle Architecture Adaptations to Static Stretching Training: A Systematic Review with Meta-Analysis.

Author

Panidi, Ioli, Donti, Olyvia, Konrad, Andreas, Dinas, Petros C., Terzis, Gerasimos, Mouratidis, Athanasios, Gaspari, Vasiliki, Donti, Anastasia, and Bogdanis, Gregory C.

Subjects
STRETCH (Physiology), ONLINE information services, SKELETAL muscle, META-analysis, SYSTEMATIC reviews, EXERCISE physiology, SPORTS, PHYSIOLOGICAL adaptation, DESCRIPTIVE statistics, RESEARCH funding, MEDLINE, INFORMATION storage & retrieval systems, DATA analysis software
Abstract

Background: Long-term stretching of human skeletal muscles increases joint range of motion through altered stretch perception and decreased resistance to stretch. There is also some evidence that stretching induces changes in muscle morphology. However, research is limited and inconclusive. Objective: To examine the effect of static stretching training on muscle architecture (i.e., fascicle length and fascicle angle, muscle thickness and cross-sectional area) in healthy participants. Design: Systematic review and meta-analysis. Methods: PubMed Central, Web of Science, Scopus, and SPORTDiscus were searched. Randomized controlled trials and controlled trials without randomization were included. No restrictions on language or date of publication were applied. Risk of bias was assessed using Cochrane RoB2 and ROBINS-I tools. Subgroup analyses and random-effects meta-regressions were also performed using total stretching volume and intensity as covariates. Quality of evidence was determined by GRADE analysis. Results: From the 2946 records retrieved, 19 studies were included in the systematic review and meta-analysis (n = 467 participants). Risk of bias was low in 83.9% of all criteria. Confidence in cumulative evidence was high. Stretching training induces trivial increases in fascicle length at rest (SMD = 0.17; 95% CI 0.01–0.33; p = 0.042) and small increases in fascicle length during stretching (SMD = 0.39; 95% CI 0.05 to 0.74; p = 0.026). No increases were observed in fascicle angle or muscle thickness (p = 0.30 and p = 0.18, respectively). Subgroup analyses showed that fascicle length increased when high stretching volumes were used (p < 0.004), while no changes were found for low stretching volumes (p = 0.60; subgroup difference: p = 0.025). High stretching intensities induced fascicle length increases (p < 0.006), while low stretching intensities did not have an effect (p = 0.72; subgroup difference: p = 0.042). Also, high intensity stretching resulted in increased muscle thickness (p = 0.021). Meta-regression analyses showed that longitudinal fascicle growth was positively associated with stretching volume (p < 0.02) and intensity (p < 0.04). Conclusions: Static stretching training increases fascicle length at rest and during stretching in healthy participants. High, but not low, stretching volumes and intensities induce longitudinal fascicle growth, while high stretching intensities result in increased muscle thickness. Registration: PROSPERO, registration number: CRD42021289884. Key Points: Static stretching training induces trivial increases in fascicle length at rest and small increases in fascicle length during stretching. High, but not low, stretching volumes and intensities induce longitudinal fascicle growth. High stretching intensities result in increased muscle thickness. Fascicle angle remains unaffected by static stretching training. [ABSTRACT FROM AUTHOR]

Published
2023
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72. Effects of a High-Volume 7-Week Pectoralis Muscle Stretching Training on Muscle Function and Muscle Stiffness.

Author

Reiner, Marina, Gabriel, Anna, Sommer, Daniel, Bernsteiner, Daniel, Tilp, Markus, and Konrad, Andreas

Subjects
SKELETAL muscle physiology, GLENOHUMERAL joint physiology, PECTORALIS muscle physiology, STRETCH (Physiology), RANGE of motion of joints, MUSCLE contraction, STRENGTH training, EXERCISE physiology, THROMBELASTOGRAPHY, RANDOMIZED controlled trials, PRE-tests & post-tests, MUSCLE strength, DESCRIPTIVE statistics, RESEARCH funding, STATISTICAL sampling, DATA analysis software, JOINTS (Anatomy)
Abstract

Background: There is evidence that high-volume static stretching training of the lower limbs can increase the range of motion (ROM) while decreasing muscles stiffness. However, to date, there is no evidence on the effects of upper limb stretching training or its effect mechanism. Therefore, this study aimed to investigate the effects of a comprehensive 7-week static stretching training program of the pectoralis major muscle (PMa) on glenohumeral joint ROM, muscle force, and muscle stiffness. Methods: Thirty-eight healthy, physically active participants (23 male, 15 female) were randomly assigned to either the PMa-static stretching intervention (PMa-SS) group or the control group. The PMa-SS group performed a 7-week intervention comprising three sessions a week for 15 min per session, including three static stretching exercises of the PMa for 5 min each. Before and after the intervention period, shoulder extension ROM, muscle stiffness of the PMa (pars clavicularis), and maximal voluntary isometric contraction (MVIC) peak torque (evaluated at both long (MVIClong) and short (MVICshort) muscle lengths) were investigated on a custom-made testing device at 45° shoulder abduction. Results: In the PMa-SS group, the shoulder extension ROM (+ 6%; p < 0.01; d = 0.92) and the MVIClong (+ 11%; p = 0.01; d = 0.76) increased. However, there were no significant changes in MVICshort or in PMa muscle stiffness in the PMa-SS group. In the control group, no changes occurred in any parameter. Conclusion: In addition to the increase in ROM, we also observed an improved MVIC at longer but not shorter muscle lengths. This potentially indicates an increase in fascicle length, and hence a likely increase in sarcomeres in series. [ABSTRACT FROM AUTHOR]

Published
2023
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77. A Human-Centered Machine-Learning Approach for Muscle-Tendon Junction Tracking in Ultrasound Images

Author

Leitner, Christoph, primary, Jarolim, Robert, additional, Englmair, Bernhard, additional, Kruse, Annika, additional, Hernandez, Karen Andrea Lara, additional, Konrad, Andreas, additional, Su, Eric Yung-Sheng, additional, Schrottner, Jorg, additional, Kelly, Luke A., additional, Lichtwark, Glen A., additional, Tilp, Markus, additional, and Baumgartner, Christian, additional

Published
2022
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86. Endothelial CCR2 Signaling Induced by Colon Carcinoma Cells Enables Extravasation via the JAK2-Stat5 and p38MAPK Pathway

Author

Wolf, Monika Julia, Hoos, Alexandra, Bauer, Judith, Boettcher, Steffen, Knust, Markus, Weber, Achim, Simonavicius, Nicole, Schneider, Christoph, Lang, Matthias, Stürzl, Michael, Croner, Roland S., Konrad, Andreas, Manz, Markus G., Moch, Holger, Aguzzi, Adriano, van Loo, Geert, Pasparakis, Manolis, Prinz, Marco, Borsig, Lubor, and Heikenwalder, Mathias

Published
2012
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94. Additional file 1 of Is There a 'Window of Opportunity' for Flexibility Development in Youth? A Systematic Review with Meta-analysis

Author

Donti, Olyvia, Konrad, Andreas, Panidi, Ioli, Dinas, Petros C., and Bogdanis, Gregory C.

Abstract

Additional file 1. Search algorithm, risk of bias assessment for randomized controlled trials and control trials, Grading of Recommendations, Assessment, Development and Evaluations (GRADE) analysis and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist.

Published
2022
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