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Physical exercise in humans induces changes in intraocular pressure, relating to the type and intensity of the workload. The purpose of the present study was to evaluate the variations in intraocular pressure and arterial blood pressure in dogs that underwent physical exercise on a treadmill. Thirty dogs were submitted to physical exercise consisting of walking (15 minutes), trotting (20 minutes), and walking (10 minutes). The intraocular pressure, blood pressure and pulse rate were recorded for each dog before starting the treadmill exercise, immediately after it ended, and after 20 minutes of passive recovery. Two-way repeated analysis of variance measurement showed the significant effect of treadmill exercise (P≤0.01) on intraocular pressure, pulse rate and diastolic blood pressure. No significant changes were observed to systolic blood pressure. Intraocular pressure and diastolic blood pressure decreased significantly during the passive recovery, and were strongly related. The pulse rate was significantly lower during the passive recovery. Although the mechanism determining the reduction in intraocular pressure during exercise remains not fully understood, our results suggest that it is strongly related to variations in arterial blood pressure.physical exercise; eye; ocular variable; arterial blood pressure; dog, Tjelesna vježba u ljudi uzrokuje promjene u intraokularnom tlaku, ovisno o vrsti i intenzitetu opterećenja. cilj ovog istraživanja bio je procijeniti varijacije intraokularnog tlaka i arterijski krvni tlak u pasa podvrgnutih tjelesnoj aktivnosti na pokretnoj traci. Trideset pasa izloženo je tjelesnoj aktivnosti koja se sastojala od hodanja (15 minuta), trčanja u formi kasa (20 minuta) i hodanja (10 minuta). Za svakog su psa zabilježeni intraokularni tlak, krvni tlak i srčani puls prije početka aktivnosti, odmah nakon završetka aktivnosti i 20 minuta nakon oporavka. Dvosmjerna analiza varijance za ponovljena mjerenja pokazala je znakovit učinak vježbe na pokretnoj traci (P ≤ 0,01) na intraokularni tlak, srčani puls i dijastolički krvni tlak. Nije bilo znakovitih promjena u sistoličkom krvnom tlaku. Intraokularni tlak i dijastolički krvni tlak znakovito su se smanjili za vrijeme oporavka i bili u znatnoj korelaciji. Srčani puls bio je znakovito niži za vrijeme oporavka. Iako mehanizam koji utječe na smanjenje intraokularnog tlaka nije sasvim jasan, rezultati pokazuju da je on u čvrstoj vezi s promjenama arterijskog krvnog tlaka.

The peroxisome proliferator-activated receptor-γ (PPAR-γ) receptor appears to play a pivotal role in the regulation of cellular proliferation and inflammation. Recent evidence also suggests that rosiglitazone, a PPAR-γ agonist, reduces acute and chronic inflammation. We hypothesized that rosiglitazone would attenuate periodontal inflammation. In the present study, we investigated the effects of rosiglitazone in a rat model of ligature-induced periodontitis. At day 8, ligation significantly induced an increase in neutrophil infiltration, as well as of gingivomucosal tissue expression of iNOS, nitrotyrosine formation, and poly (ADP-ribose) polymerase activation. Ligation significantly increased Evans blue extravasation in gingivomucosal tissue and alveolar bone destruction. Intraperitoneal injection of rosiglitazone (10 mg/kg 10% DMSO daily for 8 days) significantly decreased all of the parameters of inflammation, as described above. Analysis of these data demonstrated that rosiglitazone exerted an anti-inflammatory role during experimental periodontitis, and was able to ameliorate the tissue damage associated with ligature-induced periodontitis.

The role of nitric oxide and reactive oxygen species is well-demonstrated in inflammation. In this study, we evaluated the effect of aminoguanidine, a nitric oxide synthase inhibitor, in a rat model of periodontitis. We induced periodontitis in rats by placing a piece of 2/0 braided silk around the lower left 1st molar. At day 8, the gingivomucosal tissue encircling the mandibular 1st molar was removed for biochemical and histological analysis. Ligation significantly increased inducible nitric oxide synthase activity and expression, and damaged tissue revealed increased neutrophil infiltration, lipid peroxidation, and positive staining for nitrotyrosine formation and poly (ADP-ribose) polymerase activation. Ligation significantly increased Evans blue extravasation in gingivomucosal tissue and alveolar bone destruction. Aminoguanidine (100 mg/kg i.p., daily for 8 days) treatment significantly reduced all these inflammatory parameters, indicating that it protects against the tissue damage associated with periodontitis by reducing nitric oxide production and oxidative stress.