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Work rate was calculated as the sum of power against gravity (Pg = m · g · sin α · v) and friction (Pf = m · g · cos α · μ · v), where m is the body mass of the skier (including equipment and additional weight for each interval), g is the gravitational acceleration, α is the angle of treadmill incline, v is the speed of the treadmill belt, and μ is the frictional coefficient [5, 17].
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