Physical activity is defined as any bodily movement produced by skeletal muscles. Several factors can influence a person's physical activity levels, one of them is work from home (WFH) policy caused by Covid-19. This policy could reduce a person’s physical activity. To maintain health during the Covid-19 pandemic, most people access the internet to find health-related information. However, there is no information about the physical activity level and the relationship between physical activity and health-related internet usage during the Covid-19 pandemic in Indonesian society. This study asked 83 participants from 32 cities in Indonesia to fill the questionnaire related to their activity using the International Physical Activity Questionnaire (IPAQ) and the purpose of internet usage. Most of the respondents had moderate activity levels. Females were more active than males during the Covid-19 pandemic. A higher intensity of working from home negatively correlated with a physical activity score, however, it was not statistically significant. People who used the internet to search for a healthy diet and healthy life information were more physically active than those who did not. Thus, we assumed that people who used the internet to search for a healthy diet and healthy life information have high awareness about their health. Keywords: Physical activity, IPAQ, MET, Internet usage, Indonesia

Mosquito fish (Gambusia affinis) is a species often used as a bioindicator because it has high adaptability to water quality changes. Linear alkylbenzene sulfonate (LAS) is a surfactant often found in waters and can cause death for the biota that lives in it. This study aimed to analyze the impact of LAS surfactant on the survival of mosquito fish and to determine the minimum concentration of LAS surfactant that can cause death and tissue damage. Research conducted during April 2022 using 500 mosquito fishes. We did several tests, including a lethal toxicity test to find out the concentration of LAS surfactant that can cause death and tissue damage. The results showed that the LC50 values of LAS surfactants at exposure times of 24, 48, 72, and 96 hours were 7.64, 7.43, 7.29, and 6.83 mg/L, respectively. Mosquito fish blood glucose levels at LAS concentrations of 0, 2.65, 4.30, 6.97, and 11.3 were 56, 75, 79.6, 95, and 95.6 mg/dl. Exposure to LAS surfactant in mosquito fish can cause gill damage in the form of edema, lamella fusion, hyperplasia, lamellae epithelium swelling, and gill filaments necrosis. Another damage occurs to the liver in the form of blockage of blood vessels and sinusoids, hyperplasia, widening of the hepatic sinusoid gap, fat accumulation, and necrosis of hepatocytes.

Stress is a process that involves the perception of and response to pressure and is often related to eating behaviour. For college students, academic stress could be one factor that affects eating behaviour. So far, no longitudinal study has directly compared the same respondents’ stress levels and eating behaviours in different years of study. Thus, this study aimed to examine changes in stress levels and eating behaviour during college students’ third and final years and determine the correlation between stress levels and eating behaviour. We asked 89 undergraduate students (27 males and 62 females) to complete a questionnaire on their stress levels using the Perceived Stress Scale (PSS-10) and their eating behaviour. Our results showed that students had significantly higher stress levels during the final year than in their third year. Our results also showed that during the student’s final year, there was a significant increase in eating when feeling stressed, overeating, eating fast food, and skipping meals compared to their third year. There was also a significant decrease in healthy food consumption during the final year compared to the third year. During the third year of study, stress levels were increased by academic workload pressure; meanwhile, during the final year of study, they were affected by sex and undergraduate thesis pressure. These results indicate that differences in academic pressure in different years of study can influence stress levels and eating behaviour in college students.

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