Melina Meyer Magulas

• Moltubakk, Marie M.; Villars, Fabienne Olivia; Magulas, Melina Meyer; Magnusson, Stig P.; Seynnes, Olivier R. & Bojsen-Møller, Jens (2021). Altered Triceps Surae Muscle-Tendon Unit Properties after 6 Months of Static Stretching. Medicine & Science in Sports & Exercise. ISSN 0195-9131. 53(9), s. 1975–1986. doi: 10.1249/MSS.0000000000002671. Fulltekst i vitenarkiv Vis sammendrag

  Introduction: This study examined the effects of 24 wk of daily static stretching of the plantarflexors (unilateral 4 × 60-s stretching, whereas the contralateral leg served as a control; n = 26) on joint range of motion (ROM), muscle–tendon unit morphological and mechanical properties, neural activation, and contractile function. Methods: Torque–angle/velocity was obtained in passive and active conditions using isokinetic dynamometry, whereas muscle–tendon morphology and mechanical properties were examined using ultrasonography. Results: After the intervention, ROM increased (stretching, +11° ± 7°; control, 4° ± 8°), and passive torque (stretching, −10 ± 11 N·m; control, −7 ± 10 N·m) and normalized EMG amplitude (stretching, −3% ± 6%; control, −3% ± 4%) at a standardized dorsiflexion angle decreased. Increases were seen in passive tendon elongation at a standardized force (stretching, +1.3 ± 1.6 mm; control, +1.4 ± 2.1 mm) and in maximal passive muscle and tendon elongation. Angle of peak torque shifted toward dorsiflexion. No changes were seen in tendon stiffness, resting tendon length, or gastrocnemius medialis fascicle length. Conformable changes in ROM, passive dorsiflexion variables, tendon elongation, and angle of peak torque were observed in the nonstretched leg. Conclusions: The present findings indicate that habitual stretching increases ROM and decreases passive torque, altering muscle–tendon behavior with the potential to modify contractile function.

• Moltubakk, Marie M.; Magulas, Melina Meyer; Villars, Fabienne Olivia; Seynnes, Olivier R. & Bojsen-Møller, Jens (2018). Specialized properties of the triceps surae muscle-tendon unit in professional ballet dancers. Scandinavian Journal of Medicine & Science in Sports. ISSN 0905-7188. 28(9), s. 2023–2034. doi: 10.1111/sms.13207. Vis sammendrag

  This study compared professional ballet dancers (n = 10) to nonstretching controls (n = 10) with the purpose of comparing muscle and tendon morphology, mechanical, neural, and functional properties of the triceps surae and their role for ankle joint flexibility. Torque‐angle and torque‐velocity data were obtained during passive and active conditions by use of isokinetic dynamometry, while tissue morphology and mechanical properties were evaluated by ultrasonography. Dancers displayed longer gastrocnemius medialis fascicles (55 ± 5 vs 47 ± 6 mm) and a longer (207 ± 33 vs 167 ± 10 mm) and more compliant (230 ± 87 vs 364 ± 106 N/mm) Achilles tendon compared to controls. Greater passive ankle dorsiflexion range of motion (40 ± 7 vs 17 ± 9°) was seen in dancers, resulting from greater fascicle strain and greater elongation of the muscle. Peak electromyographic (EMG) activity recorded during passive stretching was lower in dancers, and at common joint angles, dancers displayed lower EMG amplitude and lower passive joint stiffness. No differences between groups were seen in maximal isometric plantar flexor torque, isokinetic peak torque, angle of peak torque, or work. In conclusion, the greater ankle joint flexibility of professional dancers seems attributed to multiple differences in morphological and mechanical properties of muscle and tendinous tissues, and to factors related to neural activation.

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• Solstad, Tom Erik Jorung; Dalen-Lorentsen, Torstein; Magulas, Melina Meyer; Wik, Eirik Halvorsen; Hamarsland, Håvard & Bovim, Lars Peder Vatshelle [Vis alle 10 forfattere av denne artikkelen] (2020). Idrettsforskning Webinar.

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