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Background and purpose: Mercury contamination is still a threat to the environmental and public health in both developed and developing countries. The aim of this study was to determine the total and organic mercury content in the muscle of goldfish (Carassius aurathus gibelio) obtained from the east and west of Anzali Wetland. We also assessed the health risks involved in consumption of this fish. Materials and methods: Twenty goldfish were collected from the east and west of Anzali Wetland. Total mercury concentrations were determined using Advanced Mercury Analyzer (AMA 254), and organic mercury concentrations in the muscle were also determined by AMA 254 following acid digestion and extraction with toluene. Results: Total mercury and organic mercury concentrations in the muscles tissue of goldfish collected from the east of Anzali wetland were significantly higher (106.97±56.92 ng/g ww and 88.00±45.41 ng/g ww) than those obtained from west of the wetland (45.50±16.88 ng/g ww and 40.62±14.32 ng/g ww). Also, significant positive correlations were found between concentrations of total and organic mercury and the amount of lipid. Conclusion: The mean concentrations of total mercury in all fish samples did not exceed the maximum level recommended by the World Health Organization for human consumption (0.5 mg g-1 ww). However, the maximum number of allowable consumption of fish per month in east and west of the wetland for children were found 3 and 5, respectively and for adults these allowable numbers were 13 and 25, respectively.

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 Background and purpose: Muscle damage has always been a serious problem following accidents and spinal cord injuries. Mental imagery or motor imagery is a treatment in which a patient evokes a movement to improve performance. There are limited studies in this field, so, this study aimed at investigating the effect of mental imagery on increasing the strength of elbow flexor muscles.
Materials and methods: This study was performed in 20 healthy individuals, non-athletes aged 22-25 years old. The strength of the elbow flexor muscles was measured by a dynamometer and a special tape measure was used to measure the hypertrophy of the biceps muscle. The experimental group performed strength training designed for the superior hand using free weights and at the same time performed this exercise mentally with the non-superior hand (three days a week/12 weeks). Mann-Whitney U test was used to compare the changes between superior and non-superior hand and Wilcoxan test was used to compare the amount of changes in maximum muscle contractile force.
Results: Findings showed increased elbow flexor strength and hypertrophy in both the superior hand and non-superior hand.
Conclusion: Although real exercises were more effective in improving strength and hypertrophy of flexor elbow muscles, but mental imagery also affected muscle strength and hypertrophy as much as real exercises.