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MEDICINA DELLO SPORT

A Journal on Sports Medicine


Official Journal of the Italian Sports Medicine Federation
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Medicina dello Sport 2004 June;57(2):121-6

Copyright © 2004 EDIZIONI MINERVA MEDICA

language: Italian

Evaluation of the maximal theoretical force exerted by the legs, with isotonic leg extension machine

Tentoni C. 1, Maietta Latessa P. 1, Zannoli S. 2, Corazza I. 2, Caroli E. 2, Drago E. 3, Zannoli R. 2

1 Facoltà di Scienze Motorie, Università degli Studi di Bologna, Bologna; 2 Istituto delle Malattie dell’apparato cardiovascolare, Facoltà di Medicina e Chirurgia, Università degli Studi di Bologna, Bologna; 3 Centro Interuniversitario di Studi e Ricerche in Medicina dello Sport, Istituto di Medicina dello Sport CONI-FMSI, Bologna


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Aim. The eval­u­a­tion of the max­i­mal ­force exert­able by a sub­ject in a par­tic­u­lar exer­cise is an impor­tant start­ing ­step to set up reha­bil­i­ta­tion and train­ing pro­grams. Actually, the ref­er­ence pro­ce­dure is the iso­ki­net­ic ­approach, ­which has ­some lim­i­ta­tions due to ­poor phys­io­log­i­cal agree­ment and ­high ­cost of the appa­ra­tus­es. This ­paper ­describes a meth­od for eval­u­at­ing max­i­mal ­force ­using an iso­ton­ic ­approach. The max­i­mal ­force val­ue is extrap­o­lat­ed by the lin­e­ar beha­vi­our of the rela­tion­ship ­between the ­force and the max­i­mal veloc­ity at low­er ­loads.
Methods. The meth­od has ­been ­applied to a ­group of 25 stu­dents of Sports Medicine Faculty at the University of Bologna, by ­using a AirMachine leg exten­sion (919 Tech). Loads ­were set­tled adopt­ing a ­step-up pro­to­col and the max­i­mal veloc­ity was cal­cu­lat­ed by meas­ur­ing the instan­ta­ne­ous ­angle of the lev­er. The lin­e­ar cor­re­la­tion coef­fi­cient ­between the set­tled ­loads and the max­i­mal veloc­ity ­ranged ­between 0.5679 and 0.9980 for the ­right leg and ­between 0.6791 and 0.9895 for the ­left one, and the max­i­mal esti­mat­ed ­force ­ranged ­between 26.9 kg and 248.2 kg for the ­right leg and ­between 32.6 kg and 221.9 kg for the ­left one.
Conclusion. The meth­od has ­shown a ­good fea­sibil­ity and an accept­able ­error lev­el and can be pro­posed as an alter­na­tive ­approach ­with ­respect of iso­ki­net­ic one.

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