SARS-COV-2 in Type 2 Diabetic Patients: Possible Roles of Exercise Training as a Medicine

Adaptive and maladaptive roles of different angiotensin receptors in the development of cardiac hypertrophy and heart failure

Angiotensin II (Ang II) is formed by the action of angiotensin-converting enzyme (ACE) in the renin-angiotensin system. This hormone is known to induce cardiac hypertrophy and heart failure and its actions are mediated by the interaction of both pro- and antihypertrophic Ang II receptors (AT1R and AT2R). Ang II is also metabolized by ACE 2 to Ang-(1-7), which elicits the activation of Mas receptors (MasR) for inducing antihypertrophic actions. Since heart failure under different pathophysiological situations is preceded by adaptive and maladaptive cardiac hypertrophy, we have reviewed the existing literature to gain some information regarding the roles of AT1R, AT2R, and MasR in both acute and chronic conditions of cardiac hypertrophy. It appears that the activation of AT1R may be involved in the development of adaptive and maladaptive cardiac hypertrophy as well as subsequent heart failure because both ACE inhibitors and AT1R antagonists exert beneficial effects. On the other hand, the activation of both AT2R and MasR may prevent the occurrence of maladaptive cardiac hypertrophy and delay the progression of heart failure, and thus therapy with different activators of these antihypertrophic receptors under chronic pathological stages may prove beneficial. Accordingly, it is suggested that a great deal of effort should be made to develop appropriate activators of both AT2R and MasR for the treatment of heart failure subjects.

COVID-19 and Loneliness among Older Adults: Associations with Mode of Family/Friend Contacts and Social Participation

OBJECTIVES

Given physical/social distancing due to COVID-19, we examined associations between self-reported loneliness and changes in contact with family/friends and mode of social participation among older adults.

METHODS

Data came from the 2020 National Health and Aging Trend Study (NHATS) and its supplemental mail COVID-19 survey (N = 2,910 respondents who reported changes in loneliness during the COVID-19 outbreak). We fit a generalized linear model (GLM) with Poisson and log link using increased versus the same/decreased loneliness as the dependent variable and changes in frequencies of four modalities of contact with family/friends and social participation mode during COVID-19 as the independent variables.

RESULTS

Approximately 19% of respondents reported feeling lonely on more days during COVID-19. GLM results showed that decreased in-person contact (AOR = 1.42, 95% CI = 1.17-1.73) and increased video call contact (AOR = 1.30, 95% CI = 1.01-1.66) with family/friends and on-line participation in clubs, classes, and other organized activities (AOR = 1.36, 95% CI = 1.04-1.77) were associated with higher odds of increased loneliness.

CONCLUSIONS

Virtual interaction is not an effective substitute for in-person interaction for older adults and is associated with increased loneliness.

CLINICAL IMPLICATIONS

: Innovative means of making virtual contacts more similar to in-person contacts are needed to decrease older adults' loneliness during COVID-19.