A model for the calculation of mechanical power during distance running
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A passive perspiration biofuel cell: High energy return on investment
2021, JouleCitation Excerpt :The integrated system allows substantial energy harvesting using the pinching motion and natural sweat flow with negligible energy input. Considering the energy input of pressing the fingers every 10 s (∼1 mW), such energy-harvesting behavior is attractive compared with the typical tribo/piezoelectric harvesters and BFCs that require movements or exercise as energy input (>100 W).21,22 These results exemplify the potential of the hybrid BFC-PZT harvesters’ integration for practical applications, demonstrating the most favorable EROI ever reported among all bioenergy harvesters and setting higher standards in the bioenergy collection efficiency of wearable harvesters.
The use of a running power-meter for performance analysis in five-a-side football
2021, Gait and PosturePrediction of energy expenditure during activities of daily living by a wearable set of inertial sensors
2020, Medical Engineering and PhysicsMechanical energy patterns in nordic walking: comparisons with conventional walking
2017, Gait and PostureCitation Excerpt :In particular, having assumed the transfer between energies as possible, %R calculated here represents the upper limit of possible transfer between energies and WEXT correspond to the low boundary. The effects of the different assumptions have been explored in detailed by Williams and Cavanagh [24]. We believe that, despite these limitations, the method is still valuable in comparing Nordic Walking with conventional walking.
The effects of load carriage on joint work at different running velocities
2016, Journal of BiomechanicsCitation Excerpt :The increase in total negative work during constant velocity load carriage running means that there was an increase in energy absorption by the lower limb during the stance phase (Winter, 1983). Part of this negative work occurs during the first half of stance, as the ankle and knee extensors eccentrically contract to decelerate the body, reducing both the potential and kinetic energy of the body segments plus the carried load (Williams and Cavanagh, 1983; Winter, 1983). Greater negative work performed during the first half of stance in load carriage running, as compared to unloaded running, could be due to a greater vertical displacement of the total centre of mass (body plus load) as a result of greater lower limb compression in mid-stance (Silder et al., 2015), coupled with the need to decelerate a greater total weight (body plus load).
Joint power and kinematics coordination in load carriage running: Implications for performance and injury
2016, Gait and PostureCitation Excerpt :Therefore the increased work at the knee during mid stance is likely to be more energetically costly and potentially damaging. At toe-off, an increased hip negative power with load absorbs power from the thigh segment, with simultaneous power transfer to the trunk segments [29]. This pattern of hip power absorption was seen in our findings and was largest at 3.0 m/s, and smallest at 5.0 m/s (Supplementary material).