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Growth hormone substitution titrated to obtain IGF-I levels in the physiological range in hypopituitary adults: Effects upon dynamic strength, endurance and EMG
Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för medicin och vård, Internmedicin. Östergötlands Läns Landsting, MC - Medicincentrum, EMT-endo.
Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för nervsystem och rörelseorgan, Rehabiliteringsmedicin. Östergötlands Läns Landsting, Medicincentrum, Smärt- och rehabiliteringscentrum.
Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för biomedicin och kirurgi, Cellbiologi. Östergötlands Läns Landsting, MC - Medicincentrum, EMT-endo.
2003 (engelsk)Inngår i: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 90, nr 5-6, s. 496-504Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We studied the effects of individualised growth hormone (GH) substitution, aiming at normal insulin-like growth factor I (IGF-I) levels, on biomechanical output and surface electromyogram (EMG) of isokinetic muscle strength and endurance performance in 18 hypopituitary adults and compared with 17 matched healthy controls. The muscle function tests consisted of isokinetic contractions of the right knee extensors, from which torque and EMG were recorded. Three patients were excluded from the final analysis of the muscle function tests due to technical errors and one control subject moved from the area during the study. We found that GH-deficient adults without GH substitution were weaker and had less endurance than healthy control subjects. At the group level, plasma levels of IGF-I were normalised but generally no significant effects upon biomechanical output and EMG were found after dose titration and 6 months of a constant GH dose. However, subjects with the largest changes in IGF-I had significantly better biomechanical output and EMG compared to those with small changes in IGF-I. This finding may indicate that the net increase in IGF-I levels is critical for improvements in biomechanical output, EMG and perception of fatigue to occur.

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2003. Vol. 90, nr 5-6, s. 496-504
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URN: urn:nbn:se:liu:diva-24918DOI: 10.1007/s00421-003-0895-2Lokal ID: 9322OAI: oai:DiVA.org:liu-24918DiVA, id: diva2:245241
Tilgjengelig fra: 2009-10-07 Laget: 2009-10-07 Sist oppdatert: 2017-12-13

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