title: Effects of strength and endurance training on brain-derived neurotrophic factor and insulin-like growth factor 1 in humans.
abstract: Blood neurotrophins like insulin-like growth factor (IGF-1) and brain-derived neurotrophic factor (BDNF) are discussed to mediate health benefits of physical activity in humans. The aim of the study was to analyze the training effects of moderate endurance training (Em) and strength training with high loads (Sh) on blood plasma concentrations of IGF-1 and BDNF in humans. Venous blood samples were obtained from 27 healthy students, randomly assigned to an Em, Sh, and a control group, before and after a 12-week training intervention. Sh resulted in an increase in isometric (14.5%) and dynamic (8.3%) strength of the knee extensor muscles in the Sh group and Em led to a significant increase in the endurance performance in the Em group (p<0.05). IGF-1 basal plasma concentrations decreased (p<0.05) after the intervention in all groups. There were no significant changes for BDNF. Despite specific functional adaptations induced by Em and Sh there are no correspondingly different adaptations in the basal blood concentrations of the neurotrophins IGF-1 and BDNF. Additionally, exercise per se does not result in changes in basal plasma concentrations of BDNF, suggesting that the mode of the exercise programme is a decisive factor.
authors.affiliation: Institute of Motor Control and Movement Technique, German Sport University, Cologne, Germany. t.schiffer@dshs-koeln.de
authors.forename: T
authors.initials: T
authors.lastname: Schiffer
authors.forename: S
authors.initials: S
authors.lastname: Schulte
authors.forename: W
authors.initials: W
authors.lastname: Hollmann
authors.forename: W
authors.initials: W
authors.lastname: Bloch
authors.forename: H K
authors.initials: HK
authors.lastname: Strüder
mesh_terms: D019208:Brain-Derived Neurotrophic Factor / Q000097:blood*; D015444:Exercise; D006304:Health Status; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D013177:Sports; D016474:Weight-Bearing; D055815:Young Adult
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D007334:Insulin-Like Growth Factor I