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The Journal of Sports Medicine and Physical Fitness 2000 Dicembre;40(4):290-6

lingua: Inglese

Energy ­cost of tread­mill run­ning in non-­trained ­females dif­fer­ing in ­body fat

Bunc V.

Sport Research Laboratory, Charles University Faculty of Physical Education and Sports, Prague, Czech Republic


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Background. The ener­gy ­demands of move­ment may be char­ac­ter­ised by the ener­gy ­cost C, ­which indi­cates how ­much ener­gy is need­ed to car­ry a ­body ­mass of 1 kg ­over a dis­tance of 1 m. It is gen­er­al­ly accept­ed ­that the low­er C rep­re­sents a less­er ­amount of mechan­i­cal ­work exe­cut­ed ­with the ­same effi­cien­cy. The pur­pose of ­this ­study was to ­assess the influ­ence of ­body fat on ener­gy ­cost of run­ning in ­healthy non-­trained ­females.
Methods. Energy ­cost of run­ning (C) was deter­mined on the tread­mill in a ­group of ­healthy non-­trained ­females (N=63, ­mean age=39.1±10.2 ­years, ­body ­mass=64.6±5.5 kg, ­height= 166.2±5.7 cm, V.O2max.kg-1=35.0±3.6 ml.kg-1.min-1), dif­fer­ing sig­nif­i­cant­ly in the per­cent­age of ­body fat (18.9-30.2%), ­assessed by the 10 skin­fold meas­ure­ments.
Results. Mean val­ue of C was 3.97±0.07 J.kg-1.m-1. The low­est val­ues of C ­were ­found in sub­jects ­with the low­est %BF (C ­ranged ­from 3.81 to 4.06 J.kg-1.m-1). There is a sig­nif­i­cant pos­i­tive cor­re­la­tion ­between C and %BF [C (J.kg-1.m-1)= 0.0185*%BF (%) + 3.5090; r=0.7805; p<0.001; r2=0.6091], C and ­body ­mass (BM) [C (J.kg-1.m-1) = 0.0083*BM (kg) + 3.4384; r=0.6176; p<0.001; r2 = 0.3814], and C and ­free fat ­mass (FFM) [C (J.kg-1.m-1)=0.0087*FFM (kg) + 3.5543; r=0.3521; p<0.05; r2=0.1240]. There is a neg­a­tive cor­re­la­tion ­between C and V.O2max.kg-1 [C (J.kg-1.m-1)=-0.0181* V.O2max.kg-1 (ml.kg-1.min-1) +4.6071; r=-0.8810; p<0.0001; r2=0.7761], and V.O2max.kg-1 and %BF [V.O2max.kg-1 (ml.kg-1.min-1) =-0.8401* %BF(%) + 54.1021; r=-0.7142; p<0.0001; r2=0.5101].
Conclusions. From the col­lect­ed ­data for ­untrained ­females we may con­clude: first, the high­er the train­ing ­state (V.O2max.kg-1), the low­er the ener­gy ­cost of run­ning. Second, the ener­gy ­cost of run­ning C increas­es ­with the ­increase in ­body ­mass, %BF and FFM. Third, the train­ing ­state decreas­es (V.O2max.kg-1) ­with the ­increase in %BF.

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