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Relationships between contraction properties of knee extensor muscles and fasting IGF‐1 and adipocytokines in physically active postmenopausal women
Author(s) -
Jürimäe Toivo,
Pääsuke Mati,
Kums Tatjana,
Gapeyeva Helena,
Ereline Jaan,
Saar Meeli,
Jürimäe Jaak
Publication year - 2010
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/j.1475-097x.2010.00950.x
Subject(s) - medicine , endocrinology , isometric exercise , leptin , adipokine , adiponectin , insulin , contraction (grammar) , insulin resistance , obesity
Summary The aim of this cross‐sectional study was to find possible relationships between insulin‐like growth factor‐1 (IGF‐1), adipocytokines (leptin and adiponectin) and twitch contraction (TC) characteristics of the knee extensor (KE) muscles in healthy physically active postmenopausal women ( n = 28, 64–78 years old). We hypothesized that IGF‐1 is related at least to isometric TC peak torque (Pt) as the highest value of isometric torque production and maximal voluntary contraction (MVC) torque, and there will not be any relationships between TC characteristics and leptin and adiponectin. During the measurement of MVC torque and twitch contractile properties of KE muscles, the subjects sat in a custom‐made dynamometric chair with the knee and hip angles equal to 90° and 100°, respectively. To assess the contractile properties of the KE muscles, electrically evoked isometric twitch was elicited by percutaneous electrical nerve stimulation. Serum leptin, adiponectin, IGF‐1, insulin‐like growth factor–binding protein‐3 (IGFBP‐3) and insulin were determined. There were a very few significant relationships between the measured muscle contractile parameters and fasting blood hormones. TC Pt correlated significantly with IGFBP‐3 ( r = 0·652, P = 0·001) and insulin ( r = 0·495, P = 0·007). In conclusion, this study suggests that only TC peak torque correlated positively with serum fasting IGFBP‐3 and insulin concentration. Adipocytokines leptin and adiponectin not correlated significantly with measured strength parameters in physically active postmenopausal women.