How to Differentiate Light- and Moderate-Intensity Physical Activity from Accelerometer Data? скачать в хорошем качестве

How to Differentiate Light- and Moderate-Intensity Physical Activity from Accelerometer Data?

Detecting different physical activity intensities accurately is important in research projects. This video explains how to differentiate light-, moderate-, and vigorous-intensity physical activities, and how many systems are not doing it correctly. ----------------------------LEARN MORE ABOUT FIBION---------------------------------------- Fibion has developed a new, evidence-based gold standard wearable for sedentary behavior and physical activity monitoring. Learn more at https://fibion.com/research 🆕 Collect, store and manage sedentary behavior, physical activity and tri-axial acceleration data easily and remotely - Discover new Fibion SENS Motion: https://sens.fibion.com/ ------------------------------------------------------------------------------------------------------------ Commonly, physical activity is divided into sedentary behaviour (SB), light-intensity physical activity (LPA), moderate-intensity (MPA), and vigorous-intensity activity (VPA). Sedentary behaviour has earlier been classified as all activities that have energy expenditure less than 1.5 metabolic equivalents (METs). Nowadays it has been more accurately and relevantly classified based on posture, in a way that SB is laying down and sitting. Standing still is considered as the lowest intensity physical activity. Physical activities are then classified into different categories based on the intensity of the activity (or more literally the energy expenditure of the activity). Activity is classified based on multiples of resting metabolic rate in a way that between all activities under 3 METs (excluding sedentary behaviours) are classified as light-intensity physical activity (LPA), as moderate-intensity (MPA) between 3 and 6 METs, and as vigorous-intensity activity (VPA) over 6 METs. Furthermore, moderate- and vigorous-intensity activity is often combined to form category moderate-to-vigorous intensity activity (MVPA). So basically, this classification method provides intensity classes that are relative to resting energy expenditure but not to maximal capacity of the individual. For a good quality physical activity research, it is important that measurement method is capable of distinguishing accurately between different intensity categories of physical activity as each of these intensity categories causes a different kind of stimulus for the body, therefore, providing differential health benefits or risk reductions against different adverse health conditions. Normally, accelerometry-based physical activity intensity classification is based on the magnitude of accelerations. It is based on a generic notion that the higher the accelerations, the more intensive the physical activity. This approach has considerable limitations, especially in activities, in which the device movement (or lack of movement) is disproportional to the intensity of the activity. While the magnitude of acceleration may be related to activity intensity rather linearly within a certain activity type (e.g. walking), the same is not true between different activity types. For example, energy expenditure (i.e. intensity) of standing is higher than that of sitting even if the magnitudes of accelerations are the same as in upright position since antigravitational muscles need to work to maintain the position. Furthermore, for example, during cycling, the accelerations may be smaller than during walking, even when energy expenditure of cycling is higher than in walking, as cycling does not produce ground reaction accelerations of similar magnitude as walking. --------------------------------------------------------------------------------------------------------------------- Physical activity data collection is important part of a research project but it can also be very challenging part. Accelerometers for physical activity for research are often not the easiest to use. Fibion SENS provides great alternative for Actigraph and ActivPAL as it provides cloud platform for data collection and management. Accelerometers have become an increasingly popular tool for the objective assessment of physical activity (PA). There are several hip- and thigh-worn accelerometers that are commonly used in research projects (for example ActivPAL3, ActivPAL4, Actigraph wGT3X, Actigraph GT9X). Currently, accelerometers are used both for laboratory experiments and in a free-living environment. The latter is recognized as particularly beneficial to studies considering the evaluation of human behavior. In early free-living studies, accelerometers were typically located close to the center of body mass, e.g., on the waist, hip or lower back. However, recent large cohort studies, used sensors placed on a wrist following suggestions that this body placement improves wear compliance, particularly among younger participants and during prolonged measurements. #accelerometry #physicalactivity #intensity