Project description:In this study, the primary objective was to characterise the impact of regular post-exercise (20 strength training sessions across 10 weeks) cold-water immersion (CWI) on DNA methhylation. Secondary to this, the effect of regular post-exercise CWI on strength gains and post-exercise soreness was investigated. We used microarrays to detail the global effects of CWI on DNA methylation in vastus lateralis muscle tissue.
Project description:In this study, the primary objective was to characterise the impact of regular post-exercise (20 strength training sessions across 10 weeks) cold-water immersion (CWI) on mRNA expression. Secondary to this, the effect of regular post-exercise CWI on strength gains and post-exercise soreness was investigated. We used microarrays to detail the global effects of CWI on gene expression in vastus lateralis muscle tissue.
Project description:Consequence of physical exercise in skeletal muscle was investigated in C57BL/6 mice after 4 weeks of exercise training and compared to sedentary controls. Exercised mice received four 4 weeks of regular exercise training on a motorized treadmill and were compared to sedentary controls. 6 mice of each Treatment were used to extract RNA from the quadriceps muscle three hours after the last training bout
Project description:Proteomic characterization of skeletal muscle biopsies collected from the vastus lateralis of 44 male and female human subjects. Research subjects were divided in three different groups based on their individual exercise backgrounds and physical performance testing: 1) endurance trained (males; ME, n = 9 and females; FE, n = 9, with at least 15 years’ of regular training experience), 2) strength-trained males (MS, n = 9, with at least 15 years’ of regular training experience), and 3) age-matched healthy untrained controls (males, MC, n = 9 and females FC, n = 8, with a self-reported history of <2 exercise bouts per week over the past 15 years).
Project description:Histamine receptor antagonists, commonly used to treat allergies, block histamine signalling and have been shown to impair acute and chronic adaptations to high-intensity and endurance-type exercise. Since it remains unclear whether this is a universal mechanism of muscle adaptation, this study investigated the effect of histamine receptor blockade on resistance training adaptations. Eighteen men performed 10 weeks of resistance training with either a placebo (n=9) or H1 receptor antihistamine (n=9, 180mg fexofenadine) intake before each training session. Outcomes assessed before and after the intervention included maximal strength (1RM), muscle volume (MRI), fat mass (skinfolds), fat free mass, whole-body glucose tolerance (OGTT), vascular function, dietary intake (self-reported food diaries) and muscle proteome remodelling. Both the placebo and antihistamine groups showed similar increases in muscle volume (+7% and +8%) and maximal strength (+14% and +20%) and reductions in diastolic blood pressure (-6 and -5 mmHg), total glucose level (-24% and -10%) and total insulin level (-10% and -9%) during the OGTT. Unexpectedly, the blockade group gained fat mass (+0.6 kg), while the placebo group did not (-0.3 kg), which could be related to increased dietary carbohydrate intake in the blockade, but not the placebo group (+29% vs -7%). In conclusion, histamine blockade did not impair resistance training-induced adaptations, suggesting that intercellular H1-histaminergic crosstalk is not a universal mechanism across training modalities. However, antihistamine intake led to increased habitual food intake and fat mass following 10 weeks of resistance training, possibly linked to a role of histamine in appetite regulation.
Project description:n total, 16 7-week-old male F344 rats were subjected to model regular exercise and sedentary lifestyle. In the second week after arrival and acclimatization to the reversed light/dark cycle, rats were introduced to the forced running wheel without a specific running mode. It was followed by a 12-day training phase for all 16 experimental animals (started at 9 weeks of age) by gradually increasing the running speed and duration. During the training phase, 8 best performers were selected for the runner group while the remaining 8 rats were assigned to the sedentary group. The regular forced running exercise phase for the runner group lasted for 5 weeks in total, including 4 weeks of regular running. After 4 weeks of regular exercise, rats underwent brief anesthesia and of blood from the tail vein were taken. This step was repeated for the same animals immediately after 1h of running. On the same day, a blood sample was collected from the sedentary rats following the same protocol. Plasma was collected and immediately frozen for further EV isolation. EVs were isolated from rat plasma by size exclusion chromatography. RNA libraries were constructed using CleanTag® Small RNA Library Prep Kit (Trilink Biotechnologies, USA) and sequenced on Illumina NextSeq500 instrument using NextSeq 500/550 Mid Output Kit v2.5 (150 cycles).
Project description:Human subjects were randomized for treatment with a GnRH-analogue, Goserelin, which suppresses endogenous testosterone or placebo for 12 weeks. Strength training was performed during the last 8 weeks. The suppression of testosterone resulted in an attenuation of the normal muscle adaptation to strength training (increased muscle mass and strength). To identify molecular signals involved in the response to testosterone levels, biopsies were obtained 4 hours after the last training session and gene expression compared with Affymetrix 3' microarrays. This timepoint should capture goserelin effect on both constitutive expression, training induced changes as well as acute exercise induced (4 hours) differences in mRNA levels.
Project description:This study aimed to examine if early life exercise could normalize the reduced heart mass we have previously observed in the adult hearts from growth restricted rats. We investigated the molecular pathways using microarray analysis to explain how endurance exercise in early life might be regulating the sustained increase in heart mass we have observed in these rats in adulthood. At 5 weeks of age, male WKY rats were allocated to one of the following exercise treatments: remained sedentary with post mortem (PM) at 9 or 24 weeks, early exercise training (from 5-9 weeks of age) with PM at 9 or 24 weeks, or later exercise training (from 20-24 weeks of age) with PM at 24 weeks (n=8 males/group). Exercise training involved treadmill running 5 days/ week for 4 weeks. Running duration progressively increased from 20 up to 60 minutes per day, with the treadmill speed set at 15 m/min for the first week and 20 m/min thereafter. At 9 or 24 weeks of age rats were killed with an intraperitoneal injection of Ilium Xylazil-20 (30 mg/kg) and Ketamine (225 mg/kg). The rats in the 9 week old early exercise and 24 week old later exercise groups were killed 72 hours following the last bout of treadmill running. Total RNA was obtained from the whole-hearts for analysis