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2. Effects of a 2-year exercise training on neuromuscular system health in older individuals with low muscle functionElena Monti, Sara Tagliaferri, Sandra Zampieri, Fabio Sarto, Giuseppe Sirago, Martino V. Franchi, Andrea Ticinesi, Yari Longobucco, Elisa Adorni, Marco Vicenzo Narici, 2023, original scientific article Keywords: skeletal muscles, C-terminal agrin fragment, neurofilament light chain, exercise interventions, sarcopenia, elderly
Published in DiRROS: 15.12.2023; Views: 220; Downloads: 82
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3. Upregulation of sarcolemmal hemichannels and inflammatory transcripts with neuromuscular junction instability during lower limb unloading in humansGiuseppe Sirago, Julián Candia, Martino V. Franchi, Fabio Sarto, Elena Monti, Luana Toniolo, Carlo Reggiani, Emiliana Giacomello, Sandra Zampieri, Marco Vicenzo Narici, 2023, original scientific article Keywords: skeletal muscles, neuromuscular junction, sarcolemmal hemichannels, lower limb
Published in DiRROS: 14.12.2023; Views: 234; Downloads: 83
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4. Decomposition of tensiomyogram and comparison with torque twitch responses after post-activation potentiationEnsar Abazović, Armin Paravlić, Damir Zubac, Erol Kovačević, Boštjan Šimunič, 2022, original scientific article Abstract: Objectives: This study evaluates the effect of post-activation potentiation (PAP) after 5x5s maximal voluntary isometric contractions (activation stimulus, AS) on tensiomyography (TMG) and torque twitch contractile parameters of vastus lateralis (VL) and medialis (VM), respectively. Further, we validated the decomposition of TMG response to separate responses of three fiber types. Methods: 15 healthy individuals participated in this study (40% women; age 19±2.3 years). A decomposition of VL TMG response was done after optimal fitting of three exponential curves. Results: We found main effects in contraction time (Tc) for muscle, method and time. Furthermore, we found interactions between muscle*method, method*time and muscle*method*time. Compared to PRE AS, we found shorter TMG Tc in VL and VM during the first two minutes after AS. Torque Tc remained unchanged in VL, while it increased in VM within 30 seconds after AS. A decomposition of VL TMG response confirmed PAP effects being present only in decomposed type IIb muscle fibers. Conclusion: The TMG is a sensitive method to detect PAP effects with a sensor mounted directly above the muscle belly. After the decomposition of the TMG signal to three separate muscle fiber phenotypes, we provided a non-invasive insight in the contribution of each muscle fiber phenotype to the PAP of the whole muscle.
Keywords: skeletal muscles, fast-twitch fibers, post-activation potentiation, decomposition, tensiomyography
Published in DiRROS: 05.09.2022; Views: 894; Downloads: 210
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5. The muscle contractile properties in female soccer players : inter-limb comparison using tensiomyographyArmin Paravlić, Zoran Milanović, Ensar Abazović, Goran Vučković, Darjan Spudić, Živa Majcen Rošker, Maja Pajek, Janez Vodičar, 2022, original scientific article Abstract: Objective: The present study aimed to: i) determine the contractile properties of the major lower limb muscles in female soccer players using tensiomyography; ii) investigate inter-limb differences; and iii) compare inter-limb differences between different selections and playing positions. Methods: A total of 52 female soccer players (A team; U19 and U17) were recruited. The vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), gastrocnemius medialis (GM), lateralis (GL) and tibialis anterior (TA) of both lower limbs were evaluated. Results: When the entire sample was assessed regardless of selection or playing position, there were significant inter-limb differences in all measured muscles except BF. Compared to the non-dominant limb, the dominant limb had higher delay time in VL (p=0.008), while showing lower values in VM (p=0.023), GL (p=0.043) and GM (p=0.006). Contraction time was lower in the RF of the dominant limb (p=0.005) and VM (p=0.047), while showing higher values in VL (p=0.036) and TA (p<0.001) as compared to the non-dominant limb. Conclusion: Given the differences found between the limbs in the whole sample studied, it is necessary to examine both limbs to gather a more in-depth understanding of underlying mechanisms related to neuromuscular functions in female soccer players. Level of evidence: Prognostic study, Level II.
Keywords: asymmetries, neuromuscular functions, skeletal muscles, tensiomyography, Women' s football
Published in DiRROS: 16.06.2022; Views: 582; Downloads: 241
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