15 juli 2011 kl 21:56
Redigerad 15 juli 2011 kl 21:57
två olika studier
According to famed running coach Jack Daniels, a runner expends 1 percent more aerobic energy for every 100 g of weight on a shoe. That seemingly slight difference is significant. A researcher at the Nike Research Laboratory calculated that shaving 4 oz. from a shoe would mean a faster marathon time by up to 3 minutes. By comparison, using the illegal, performance-enhancing drug EPO saves a marathoner just over 3 minutes.
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Abstract: Fifteen highly trained men performed treadmill running at 12 km X h-1 to determine the effect of lower extremity loading ...The results demonstrated that VO2 and heart rate increased as load was increased on both the thighs and feet. All changes were statistically significant except for the heart rate changes due to thigh loading. The increases in VO2 due to foot loading--approximately 7.2% per kg of load--were nearly twice as great as those due to thigh loading. The results also demonstrated that 1.00 kg added to the feet produced small but significant increases in stride length (1.4 cm), swing time (9 ms), and flight time (6 ms) and a decrease in peak ankle velocity (0.23 m X s-1).
1kg låter mycket men 2x350g=700gram mer än barfota... tål att tänkas på...
