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Original articles  BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION 

The Journal of Sports Medicine and Physical Fitness 2002 March;42(1):71-8

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Bench/step training with and without extremity loading. Effects on muscular fitness, body composition profile, and psychological affect

Engels H. J., Currie J. S., Lueck C. C, Wirth J. C.

From the Division of HPR - Exercise Science, Wayne State University, Detroit, Michigan, USA *Physical Therapy Department, Mount Clemens General Hospital, Mount Clemens, Michigan, USA


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Back­ground. To ­study the ­effect of ­bench/­step ­group exer­cise ­with and ­without ­extremity ­loading on mus­cular fit­ness, ­body com­po­si­tion, and psy­cho­log­ical ­affect.
­Methods. Experi­mental ­design: a pros­pec­tive ­training ­study. Set­ting: gen­eral com­mu­nity fit­ness ­center. Par­tic­i­pants: 44 ­healthy ­adult ­females (age: 21-51 yrs). Inter­ven­tions: 12 ­weeks of ­bench/ ­step exer­cise (3 ses­sions/­week, 50 min/ses­sion, 60-90% ­HRmax). Sub­jects ­were ran­domly ­assigned to ­groups ­that ­trained ­with (WT, n=16) and ­without (NWT, n=16) 0.68 kg/­ankle and 1.36 kg/­hand ­weights ­while 12 sub­jects ­served as non-­training con­trols (NTC). Meas­ures: pre- and post­inter­ven­tion mus­cular ­strength and endu­rance for ­knee and ­elbow ­flexion and exten­sion, and for ­shoulder abduc­tion and adduc­tion ­were exam­ined by iso­ki­netic dyna­mom­etry. ­Body com­po­si­tion was ­assessed ­with hydro­static ­weighing and psy­cho­log­ical ­affect by ques­tion­naire.
­Results. ­Thirty-two sub­jects com­pleted the ­study. ­ANOVA ­revealed ­that pre- to ­postinter­ven­tion ­changes for ­body fat (2.6%), fat-­free ­weight (+0.7 kg), fat ­weight (-1.9 kg), and ­knee ­flexion ­peak ­torque ­were sig­nif­i­cantly dif­ferent in the ­bench/step exer­cise ­trained (WT+NWT) com­pared to the NTC ­study ­group. Spe­cific com­par­i­sons of ­muscle ­strength and endu­rance ­change ­scores of WT+NWT rel­a­tive to NTC, and of WT rel­a­tive to NWT ­revealed no ­other sig­nif­i­cant dif­fer­ences ­between ­groups. Pos­i­tive and neg­a­tive affec­tive ­states ­were sim­ilar ­among ­study ­groups ­before and ­after the inter­ven­tion.
Con­clu­sions. Par­tic­i­pa­tion in ­bench/­step ­group exer­cise ­improved ­body com­po­si­tion but was of lim­ited or no ­value as a ­modality to ­change mus­cular fit­ness and psy­cho­log­ical ­affect in ­healthy ­adult ­females. The use of ­ankle and ­hand ­weights ­failed to ­enhance ­training adap­ta­tions.

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