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dc.contributor.authorBruseghini, Paolo
dc.contributor.authorCapelli, Carlo
dc.contributor.authorCalabria, Elisa
dc.contributor.authorRossi, Andrea
dc.contributor.authorTam, Enrico
dc.date.accessioned2020-05-11T09:29:33Z
dc.date.available2020-05-11T09:29:33Z
dc.date.created2019-12-17T14:48:13Z
dc.date.issued2019
dc.identifier.citationFrontiers in Physiology. 2019, 10, 1260.en_US
dc.identifier.issn1664-042X
dc.identifier.urihttps://hdl.handle.net/11250/2653825
dc.descriptionThis is an openaccess article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en_US
dc.description.abstractWe compared the effects of aerobic high-intensity training (HIT) and isoinertial resistance training (IRT) on the strength, mass, architecture, intermuscular adipose tissue (IMAT) quality, and neuromuscular activation of the quadriceps in elderly subjects. Twelve healthy men (69.3 ± 4.2 years; 77.8 ± 10.4 kg; 1.72 ± 0.05 m) were exposed to 8 weeks of HIT (7 × 2-min cycling repetitions at 90% of V.O2peak, 3 times/week) and, after 4 months (detraining), to IRT (4 × 7 maximal concentric–eccentric knee extensions, 3 times/week). Before and after trainings, we measured knee extension isometric (TMVC) and dynamic (TC) maximal concentric torque, anatomical cross-sectional area (ACSA) at 25, 50, and 75% of femur length, quadriceps volume (Vol), IMAT, pennation angle (θp) of the fibers from the vastus lateralis, and voluntary activation (%Act). TMVC and TC were significantly larger only after IRT (P = 0.008); IRT was able to elicit a greater increase of ACSA than HIT; Vol increases similarly and significantly after HIT and IRT (P = 0.003–0.001); IMAT at 50% of femur length decreased after both HIT and IRT (P = 0.001–0.003); physiological cross-sectional area (PCSA) was larger after IRT than before (P = 0.025); specific torque did not change throughout the study (45.5 N cm–2 ± 12.0); %Act of the quadriceps was significantly affected only by IRT (P = 0.011). Both HIT and IRT are able to elicit beneficial modifications of muscular mass, architecture, and quality (reducing IMAT) in elderly subjects in connection with an amelioration of strength. HIT and IRT caused a homogeneous increase of ACSA and of Vol of the quadriceps. PCSA increases, but specific strength per unit of PCSA did not change. The increases of functional torque seemed to be attributed to a parallel increase of %Act and muscle hypertrophy only after IRT. Data suggest that IMAT may be a prominent indicator to track metabolic-dependent activity and skeletal muscle quality.en_US
dc.language.isoengen_US
dc.subjectagingen_US
dc.subjecthigh-intensity interval trainingen_US
dc.subjectisoinertial resistance trainingen_US
dc.subjectmuscle volumeen_US
dc.subjectmuscle architectureen_US
dc.subjectmuscle activationen_US
dc.subjectintermuscular adipose tissueen_US
dc.titleEffects of High-Intensity Interval Training and Isoinertial Training on Leg Extensors Muscle Function, Structure, and Intermuscular Adipose Tissue in Older Adultsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© 2019 Bruseghini, Capelli, Calabria, Rossi and Tam.en_US
dc.source.pagenumber1-14en_US
dc.source.volume10en_US
dc.source.journalFrontiers in Physiologyen_US
dc.identifier.doi10.3389/fphys.2019.01260
dc.identifier.cristin1762108
dc.description.localcodeSeksjon for fysisk prestasjonsevne / Department of Physical Performanceen_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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