Physical exercise as a tool to help the immune system against COVID-19: an integrative review of the current literature Clinical and Experimental Medicine Springer Nature Link

As we navigate through the upcoming months, taking proactive steps to strengthen your immune system will pay off in the long run. By integrating a nutrient-rich diet full of antioxidants, Omega-3 fatty acids, flavonoids, and Vitamin C with regular physical activity, you’re not only fortifying your immune defenses but also enhancing your overall well-being. Omega-3 fatty acids are essential fats that have numerous health benefits, including enhancing your immune system.

Physical Activity Basics

The cytokine storm generates an immunological system attack against the organism, which can cause substantial lesions in organs such as the lung, heart, brain, kidneys, spleen, liver and lymph nodes. The increase of neutrophils, macrophages and monocytes in association with a dysfunction of the IFN-I response has been reported as the main cause of lethality in SARS-CoV and MERS-CoV pneumonia, and a similar conclusion has been suggested for SARS-CoV-2 [9, 37, 38]. After aerobic physical exercise (approximately 24 h), there is a significant reduction in neutrophil chemotaxis, however, without compromising bactericidal activity. The reduction in neutrophil chemotaxis is reversed within 48 h after physical activity, during which the opportunistic activity of infectious microorganisms can occur [23]. The main mode of transmission is contact with droplets containing viral particles eliminated through the cough or sneeze of an infected person, and the incubation period usually varies from 2 to 14 days. Approximately 80% of the cases are asymptomatic or with mild symptoms, and the others can be severe or critical and can lead to death [8].

However, the mechanisms remain to be elucidated and more research is required to determine whether polyphenols should be recommended for immune support. Vitamin D also has an inverse relationship with the reactive oxygen species production (Berridge, 2016). The majority of individuals from different countries, primarily from developed countries, suffer from vitamin D deficiency (Sizar et al., 2021). Though there are dietary sources for vitamin D, it is mainly synthesized beneath the skin when exposed to solar ultraviolet B radiation from sunlight.

Helpful ways to strengthen your immune system and fight off disease.

You don’t need to engage in intense workouts to reap the immune-boosting benefits of exercise. Flavonoids are a diverse group of phytonutrients found in almost all fruits and vegetables. These compounds have powerful antioxidant and anti-inflammatory properties that can enhance your immune system. Green tea, in particular, is rich in flavonoids and offers numerous health benefits.

Creating an Exercise Plan for Immunity

As shown by Oliveira and Gleeson (2010) sustained cycling activity was able to reduce the TLR4 expression significantly by 45% after 1h of intense training in comparison with the control group. Still, it may be caused by high levels of IL-6 released after training, which may compete with the physiological NFkB pathway of TLR, as discussed in several studies (Favere et al., 2021). Moreover, IL-6 secretion exhibits proinflammatory properties by stimulating the release of immunity regulators, including IL-10 and IL-1 receptor agonist (Dinarello, 2018).

3.6. Effects on cytokines

• Some studies show that excessive exercise boosts IL-10 as a counter-regulatory mechanism (190, 191), while others find reduced IL-10 production in certain athletes (192).
• Proposed model of the relationships between ageing, infection risk and physical activity.
• Prospective clinical trials and mechanistic studies will help clarify the roles of varying exercise intensities in long-term immune adaptation, ultimately providing valuable evidence-based guidelines for sports medicine and exercise nutrition.
• In addition to analyzing the phenotype, function, and mitochondrial metabolism of NK cells in response to inflammatory stimuli, the researchers exposed expanded NK cells from trained and untrained older adults to different pharmacological blockers, such as propranolol and rapamycin.
• Vitamins E and C are the antioxidants that occur naturally in fruits and vegetables which protect the body from free oxygen radicals formed during inflammatory reaction or activation of phagocytosis of invading microorganisms (Kurutas, 2016).
• The immune system is the body’s defense system that ensures overall health and survival; it protects the body from invading pathogens or microflora residing in the body (gut microbiome) and regulating its inner system.

During the current COVID-19 crisis, parents are looking for ways to keep their children safe. Making sure your children are well fed, getting enough sleep, and getting exercise are common sense measures. The immune system consists of certain blood cells and molecules, such as immunoglobulins and cytokines, that help the body fight infection. To be clear, there is currently no scientific evidence that regular exercise can help children or adults resist COVID-19. No doubt a lot of research will be taking place during this crisis to see what health habits seemed to protect people against getting sick. The first one comprises physical and chemical barriers and the action of cells such as macrophages, dendritic cells (DCs), natural killer cells (NKs), neutrophils and molecules such as cytokines, interleukins (ILs), nitric oxide (NO) and superoxide anion (O2–).

Host condition and COVID-19

Options for aerobic activities to be performed at home include walk briskly around the house, up- and downstairs, dancing and jumping rope. When possible, walking or running outdoors, cycling, gardening work and family games are interesting alternatives, as long as infection prevention measures are maintained [79]. Physical activity is considered a non-medication practice for the prevention and treatment of diseases of psychological, physical and/or metabolic origin [78].

Effectively boost your immune system by focusing on these 4 important lifestyle factors.

However, prolonged high-intensity exercise has less impact on NK cell numbers but also leads to NK cell functional suppression, particularly in cases of overtraining. This functional exhaustion results in a reduced immune response, increasing the risk of infections. Additionally, both acute and long-term HIIT have been shown to enhance NK cell activity and function. A single session of HIIT boosts NK cell activity by elevating the activities of antioxidant enzymes and their biological roles (98). Lin et al. demonstrated that 6 weeks of HIIT enhances NK cell mitochondrial membrane potential, reduces mitochondrial oxidative burden (MOB), and increases perforin and granzyme B levels, thereby improving NK cell cytotoxicity against tumor cells (51).

Dairy-Derived Supplements or Functional Foods

The difference ranges from −100 to +100, with positive values denoting a higher prevalence of physical activity among best beginner fitness apps men, negative values indicating a higher prevalence among women and zero representing equality. Consequently, differences with a 95% confidence interval encompassing zero were deemed statistically non-significant. Country-level estimates of socioeconomic and gender-based inequalities in active leisure, transport and labor for the 68 WHO STEPS countries are available in the Supplementary Information.

Conclusion: Commit to a Healthy Lifestyle

Incorporating exercise into your daily life is a long-term investment in your health. Beyond immunity, regular physical activity reduces the risk of chronic diseases like diabetes, heart disease, and osteoporosis. Similarly, while prolonged maintenance or worsening of obesity and MS perpetuates deregulation of immune responses, promoting greater risks of the individual developing diseases and increasing their vulnerability to infection by the novel coronavirus [43, 59, 61]. An association between physical activity and reduction of inflammatory markers in obese and overweight patients is suggested [13].

Global physical activity inequalities

Studies show that a well-planned exercise regimen can strengthen immunity and reduce the severity of common colds. Let us find out how exercise influences immunity, its role in reducing the impact of colds, and best practices for leveraging physical activity for better health. The adipose tissue is not the only one affected by the deposition of fats, because of that, bone marrow and thymus also present significant changes to the immune system of obese individuals and those with MS [67]. Thus, there is a marked deregulation of immune responses, which leads to a lower presence of circulating T cells, reducing the response to pathogens [60, 61, 65]. The complement system can also be activated and has an important role in coronavirus infections, because it helps the innate immune system to identify antigens.