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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

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


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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