Effect of 50 grams increasing of sport shoe's weight on running economy in a 15 minuets running protocol on treadmill

The aim of this study was to test the effect of 50 gr changes in sport shoe's weight on Vo2max and running economy during 15 minutes running protocol.
15 active males (age of 24.60 ± 2.06; height of 178 ± 5.83 cm) were selected in this study. Subjects ittrcicitrap in a 15 minutes running protocol in three running speeds of 4, 6 and 8 km/h. Total time for each running speed was 5 minutes. Vo2max was measured using Metamax gas analyzer and running economy was determined by calculating the slope of vo2max changes during 15 minutes running. One way repeated measure ANOVA was used to test hypotheses (p Vo2 max increased significantly during 15 minutes running, however, no significant changes was observed in slope of Vo2 max when we increased 50 gr shoe's weight.
50 gr increases in sport shoe's weight could increase mean Vo2max but may not affect running economy in a 15 minutes running protocol.