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Wearable activity trackers are devices that are comfortably worn on the body and are designed to be effective in monitoring daily physical activity and improving physical fitness of the wearer. This review aimed to investigate the impact of the coronavirus disease 2019 (COVID-19) pandemic on physical activity measured using wearable activity trackers and discuss future perspectives on wearable activity trackers during pandemics. Daily physical activity was significantly decreased during the COVID-19 pandemic.
The coronavirus disease 2019 (COVID-19) pandemic has emerged and become prolonged, significantly affecting the lives of people worldwide. To date (September 2021), over 220,000,000 coronavirus cases and 4,500,000 deaths due to COVID-19 have been confirmed across the globe [1]. New coronavirus variants have been appearing one after another, and some mutated strains, such as the Delta variant, may be more contagious, virulent, and vaccine-resistant, which will make it difficult for humans to manage the pandemic effectively [2]. Several countries took non-pharmaceutical public health measures such as lockdown [3] and social distancing [4] in addition to conventional infection control measures (e.g., handwashing and wearing of face masks); however, the spread of COVID-19 is not currently controlled. People are required to make behavioral and lifestyle changes in this pandemic era. The development of technologies and systems that enable disease prevention, effective healthcare without a risk of infection, and protection of human life is critical [5].
Wearable devices that can comfortably be worn on the body and perform several tasks in conjunction with handheld devices, such as smartphones, play a pivotal role in healthcare [6]. Recent systematic reviews have shown that wearable devices are useful for monitoring heart rate and sleep in hospital settings [7], increasing physical activity in children and adolescents [8], improving health-related outcomes in patients with cancer [9], and reducing body weight in individuals with obesity [10]. In addition, during the COVID-19 pandemic, sleep pattern and duration were accurately and effectively monitored by wearable devices [11][12][13][14][15]. On the other hand, social distancing or self-isolation can decrease daily physical activity [16], and such physical inactivity may increase cardiovascular risks [17]; further, physical inactivity itself was associated with an increased risk of hospitalization due to COVID-19 (relative risk = 1.32; 95% confidence interval [CI], 1.10–1.58) [18]. Physical inactivity is a global health problem responsible for the increasing risk of noncommunicable diseases, such as diabetes, coronary heart disease, and breast and colon cancers, and Lee et al. [19] reported that the life expectancy of humans would increase by 0.68 years by increasing physical activity. Promoting and increasing physical activity are the cornerstone of the management of diabetes and obesity, which are now the risks of severe COVID-19 as well as public health epidemics.
Authors, Year | Subjects Countries |
Study Design Study Period |
Wearable Activity Trackers | Results |
---|---|---|---|---|
Sun et al., 2020 [20] | 1062 patients with major depressive disorder or multiple sclerosis in Italy, Spain, Denmark, the United Kingdom, and Netherlands Age: No description BMI: No description |
Prospective cohort study a part of the RADAR-CNS studies Between 1 February 2019 and 5 July 2020 |
Smartphone Fitbit |
Daily step count↓ in young subjects Heart rate↓ Time spent on social media↑ Sleep duration↑ |
Kańtoch E and Kańtoch A, 2021 [22] | 5 adult volunteers (2 men and 3 women, 2 subjects with history of cardiovascular diseases) Poland Age: 57 ± 22.38 years BMI: 27.80 ± 2.95 kg/m2 |
Retrospective observational study Between 22 January 2019 and 30 April 2020 |
Fitbit Versa smartwatch | Daily step count↓ Resting heart rate↓ Sleep duration→ |
Mishra et al., 2021 [24] | 10 community-dwelling older adults (6 men and 4 women) United States Age: 77.3 ± 1.9 years BMI: 27.5 ± 1.6 kg/m2 |
Prospective observational study Between January-March 2020 and March–September 2020 |
ActivePERS/PAMSys pendant | Daily step count↓ Standing%↓ Walking%↓ Sitting%↑ Sleep quality→ |
Woodruff et al., 2021 [25] | 121 subjects (23 men, 96 women, 1 cisgender, and 1 unknown) Canada Age: 36.2 ± 13.12 years BMI: No description |
Prospective observational study Between March 2020 and April 2020 |
Various activity trackers, e.g., Apple Watch, Fitbit, Samsung, and Garmin | Daily step count↓ Sedentary time↑ |
Ong et al., 2021 [26] | 1824 city-dwelling, working adults (883 men and 941 women) Singapore Age: 30.94 ± 4.62 years BMI: No description |
Prospective cohort study Between 2 January 2020 and 27 April 2020 |
Fitbit | Daily step count↓ Time spent on moderate-to-vigorous activity↓ Resting heart rate↓ Sleep duration↑ Sleep efficiency→ |
Pépin et al., 2020 [27] | Approximately 742,000 individuals using wearable activity trackers (proportion of women: 37.8%) Australia, Canada, China, France, Germany, Ireland, Italy, Japan, Netherlands, Singapore, Switzerland, United Kingdom, and United States Age: 35–46 years BMI: No description |
Retrospective observational study Between 1 December 2019 and 13 April 2020 |
Withings | The number of steps↓ in countries with lockdown The number of steps↑ in Sweden without lockdown |
Capodilupo and Miller, 2021 [28] | 5436 individuals using a wearable activity tracker (3900 men and 1536 women) United States Age: 40.25 ± 11.33 years BMI: No description |
Retrospective observational study Between 1 January 2020 and 15 May 2020 |
WHOOP strap | Exercise frequency↑ in all subjects Exercise frequency↓ in subjects aged 18–25 years Resting heart rate↓ Heart rate variability↑ Sleep duration↑ |
Zinner et al., 2020 [29] | 14 highly trained athletes (6 men and 8 women) Germany Age: 17.1 ± 1.9 years BMI: 22.9 ± 1.4 kg/m2 |
Retrospective observational study During 4 weeks prior to and after the social distancing and lockdown on 23 March 2020 |
Polar M430 | Training time↓ Time spent on light- and moderate-intensity physical activity↓ Sitting time↓ Time spent lying down↑ |
Taylor et al., 2021 [23] | 311 patients with heart failure (240 men and 71 women) United Kingdom Age: 68.8 years BMI: <18.5 kg/m2 (0.7%), 18.5–24.9 kg/m2 (22.3%), 25–29.9 kg/m2 (32.8%), >30 (44.3%) |
Prospective observational study During 4 weeks preceding and following the lockdown on 23 March 2020 |
Triage HF | Daily physical activity↓ |
In conclusion, daily physical activity was significantly decreased during the current COVID-19 pandemic. It depends on the types of non-pharmacological public health measure; however, the reduction in daily physical activity reaches approximately 10–50% of the amount of daily physical activity before the pandemic. After the current pandemic, the world may confront a significant increase in the number of individuals with metabolic disturbances, such as obesity and diabetes. It should be considered that healthcare professionals encourage people to increase (or at least maintain) daily physical activity via wearable technologies such as smartphone applications. If we construct an effective healthcare system involving wearable activity trackers, we will be able to prevent health problems due to physical inactivity and hospitals’ burden during pandemics in the future.