Abstract
Running is a popular way to become or stay physically active and to maintain and improve one's musculoskeletal load tolerance. Despite the health benefits, running-related injuries affect millions of people every year and have become a substantial public health issue owing to the popularity of running. Running-related injuries occur when the musculoskeletal load exceeds the load tolerance of the human body. Therefore, it is crucial to provide runners with a good estimate of the cumulative loading during their habitual training sessions. In this study, we validated a wearable system to provide an estimate of the external load on the body during running and investigated how much of the cumulative load during a habitual training session is explained by GPS-based spatiotemporal parameters. Ground reaction forces (GRF) as well as 3D accelerations were registered in nine habitual runners while running on an instrumented treadmill at three different speeds (2.22, 3.33, and 4.44 m/s). Linear regression analysis demonstrated that peak vertical acceleration during running explained 80% of the peak vertical GRF. In addition, accelerometer-based as well as GPS-based parameters were registered during 498 habitual running session of 96 runners. Linear regression analysis showed that only 70% of the cumulative load (sum of peak vertical accelerations) was explained by duration, distance, speed, and the number of steps. Using a wearable device offers the ability to provide better estimates of cumulative load during a running program and could potentially serve as a better guide to progress safely through the program.
Highlights
Recreational distance running is one of the most popular forms of physical activity (Pedisic et al, 2019)
Force plate data was first low-pass filtered in MatLab (Mathworks, Natick, US) using a third order Butterworth filter with a cut-off frequency of 45 Hz to avoid smoothing out highfrequency impact transients parsed into individual steps. vGRFpeak was defined as the maximum Vertical ground reaction forces (vGRF) during 40– 60% stance
Average vGRF was significantly correlated with ACC_v, ACC_ml, and ACC_ap (Table 1)
Summary
Recreational distance running is one of the most popular forms of physical activity (Pedisic et al, 2019). 20% of all people in Western countries go out for a run once or twice a week. Runners profit from the associated health benefits which range from improvements in mental health to prevention of chronic diseases. Recreational running can be considered as an ideal lifestyle medicine (Lee et al, 2017). Runners must receive the right running dose to reap these health benefits. Getting the dose right can be tricky as the dose must exceed the minimal amount of running needed to receive its health benefits whereas running too much can lead to running-related injuries (RRIs) (Bertelsen et al, 2017)
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