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- W1976208072 abstract "It has been shown that asymmetrical intrauterine growth restriction is denoted by disproportional reduction of muscle mass compared to body weight reduction. However, the effects of IUGR on regional vascular resistance and blood flow of skeletal muscles and their contractile function have not been studied until now. Therefore, muscle blood flow (MBF) and isometric force output of serial stimulated hindlimb plantar flexors was measured in thiopental -anesthetized normal weight (NW; n = 9) and intrauterine growth restricted (IUGR; n = 9) one-day-old piglets. Additionally, muscle vascular resistance (MVR) and thyroid hormones were estimated. MBF was found to be markedly increased in IUGR piglets by 36% with a concomitant MVR reduction of 37% (p < 0.05). Isometric force of the plantar flexors was considerably higher in NW than in IUGR piglets (p < 0.05). However, amount of muscle fatigue was more pronounced in NW piglets (9.1 ± 2.8%) than was in IUGR piglets (3.7 ± 2.3%) (p < 0.05). Furthermore, specific tension of NW muscles (18.8 ± 0.7N/cm2) was significantly lower than for IUGR muscles (21.2 ± 0.9N/cm2) (P<0.05). IUGR newborn piglets exhibited increased plasma levels of thyroxine (T4) (p < 0.05), whereas triiodothyronine (T3) showed similar values in both animal groups. These data clearly indicate that muscle hemodynamics and contractile function are more developed in newborn IUGR piglets. Furthermore it is suggested that the improved tolerance to fatigue during isometric contractions may indicate an increased oxidative capacity of calf muscles due to intrauterine growth restriction." @default.
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- W1976208072 date "2000-06-01" @default.
- W1976208072 modified "2023-09-24" @default.
- W1976208072 title "Reduced muscle vascular resistance in intrauterine growth restricted newborn piglets" @default.
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- W1976208072 doi "https://doi.org/10.1016/s0940-2993(00)80045-7" @default.
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