Effect of very low calorie diet on body composition and exercise response in sedentary women

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Deutscher übersetzter Titel:Auswirkung einer äußerst kalorienarmen Diät auf die Körperzusammensetzung und die Reaktion auf körperliche Belastung bei inaktiven Frauen
Autor:Eston, R.G.; Shephard, S.; Kreitzman, S.; Coxon, A.; Brodie, D.A.; Lamb, K.L.; Baltzopoulos, V.
Erschienen in:European journal of applied physiology
Veröffentlicht:65 (1992), 5, S. 452-458, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:1439-6319, 0301-5548
DOI:10.1007/BF00243513
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Erfassungsnummer:PU199411060646
Quelle:BISp

Abstract des Autors

The effect of very low calorie diet (VLCD) on fat-free mass (FFM) and physiological response to exercise is a topic of current interest. Ten moderately obese women (23-57 yr) received VLCD (1695 kJ/d) for 6 wks. FFM, and heart rate (fc), blood lactate (lab), mean arterial pressure (MAP), respiratory exychange ratio (R) and rating of perceived exertion (RPE) were measured during a submaximal cycle ergometry test 1 wk before, in the 2nd and 6th wk, and 1 wk after VLCD treatment. Strength and muscular endurance of the quadriceps and hamstrings were tested by isokinetic dynamometry. The 11.5-kg reduction in body mass was approximately 63% fat and 37% FFM. The latter was attributed largely to the loss of water associated with glycogen. Whilst exercise fc increased by 9-14 beats/min, there were substantial decreases in submaximal MAP, lab and R during VLCD. R and fc returned to normal levels after VLCD. Gross strength decreased by 9 and 13% at 1.05 rad/s and 3.14 rad/s, respectively. Strength expressed relative to body mass (NM/kg) increased at the lower contraction velocity, but there was no change at the faster velocity. Muscular endurance also decreassed by 62 and 82% for the hamstrings and quadriceps, respectively. We concluded that the strength decrease was a natural adaptation to the reduction in body mass as the ratio of strength to FFM was maintained. Despite the physiological alterations, subjects could tolerate short-term, steady-state exercise during VLCD, with only slight increases in RPE.