Muscular adaptations to computer-guided strength training with eccentric overload

• Verfasst von: Friedmann-Bette, Birgit [VerfasserIn]
• Verfasst von: Kinscherf, Ralf [VerfasserIn]
• Verfasst von: Vorwald, Silke [VerfasserIn]
• Verfasst von: Borisch, Stefan [VerfasserIn]
• Verfasst von: Richter, Götz Martin [VerfasserIn]
• Verfasst von: Bärtsch, Peter [VerfasserIn]
• Titel: Muscular adaptations to computer-guided strength training with eccentric overload
• Verf.angabe: B. Friedmann, R. Kinscherf, S. Vorwald, H. Müller, K. Kucera, S. Borisch, G. Richter, P. Bärtsch and R. Billeter
• E-Jahr: 2004
• Jahr: September 2004
• Umfang: 12 S.
• Fussnoten: Vom Autor zitiert als: Increased expression of fast myosin heavy chain mRNA in human skeletal muscle after computer-guided strength training with eccentric overload ; Gesehen am 20.10.2017
• Titel Quelle: Enthalten in: Acta physiologica Scandinavica
• Ort Quelle: Oxford [u.a.] : Wiley-Blackwell, 1940
• Jahr Quelle: 2004
• Band/Heft Quelle: 182(2004), 1, Seite 77-88
• ISSN Quelle: 1365-201X
• DOI: doi:10.1111/j.1365-201X.2004.01337.x
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: fibre types
• Sach-SW: gene expression
• Sach-SW: maximal strength
• Sach-SW: muscle cross-sectional area
• Sach-SW: resistance training
• Sach-SW: strength endurance capacity
• K10plus-PPN: 1564632679

Abstract

Aims:  In order to investigate the muscular adaptations to a novel form of strength training, 18 male untrained subjects performed 4 weeks of low resistance-high repetition knee extension exercise. Methods:  Nine of them trained on a conventional weight resistance device (Leg curler, CON/ECC group), with loads equivalent to 30% of the concentric one-repetition maximum (1RM) for both the concentric and eccentric phase of movement. The other nine trained on a newly developed computer-driven device (CON/ECC-OVERLOAD group) with the concentric load equivalent to 30% of the concentric 1RM and the eccentric load equivalent to 30% of the eccentric 1RM. Results:  Training resulted in significantly (P ≤ 0.05) increased peak torque and a tendency (P = 0.092) to increased muscle cross-sectional area for the CON/ECC-OVERLOAD but not the CON/ECC group, while strength endurance capacity was significantly (P ≤ 0.05) increased in the CON/ECC group only. RT-PCR revealed significantly increased myosin heavy chain (MHC) IIa and lactate dehydrogenase (LDH) A mRNAs, a tendency for increased MHC IIx mRNA (P = 0.056) and high correlations between the changes in MHC IIx and LDH A mRNAs (r = 0.97, P = 0.001) in the CON/ECC-OVERLOAD group. Conclusions:  These results indicate a shift towards a more type II dominated gene expression pattern in the vasti laterales muscles of the CON/ECC-OVERLOAD group in response to training. We suggest that the increased eccentric load in the CON/ECC-OVERLOAD training leads to distinct adaptations towards a stronger, faster muscle.