Int J Sports Med 1987; 08(4): 281-285
DOI: 10.1055/s-2008-1025670
© Georg Thieme Verlag Stuttgart · New York

Effects of Rapid Weight Reduction on Force Production and Vertical Jumping Height

J. T. Viitasalo1 , H. Kyröläinen1 , C. Bosco1 , M. Alen2
  • 1Department of Biology of Physical Activity, University of Jyväskylä, Finland
  • 2Department of Health Sciences, University of Jyväskylä, Finland
Further Information

Publication History

Publication Date:
14 March 2008 (online)


The effects of three weight reduction methods on maximal strength, rate of force development, vertical jumping height, and mechanical power were studied in track and field athletes and volleyball players. The three methods were sauna, diet with diuretic, and diuretic alone. The reductions in weight achieved were 3.4%, 5.8%, and 3.8% of body weight after sauna, diet +diuretic, and diuretic, respectively (P<0.001). Maximal isometric leg strength and the rate of isometric force development were decreased after the sauna and diet +diuretic treatments. Dehydration caused by the diuretic method alone did not impair neuromuscular performances. As had been expected from theoretical calculations, the rise of the body center of gravity in vertical jumping was slightly improved with all three treatments, the improvement being the greatest following the diuretic treatment (7.1%, (P<0.001). However, when the work performed was extended for 15 s, an improved power output could be observed only with the diet +diuretic treatment (P<0.01). No explanation for the results observed could be made in terms of physiologic parameters.