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ECCENTRIC FORCES DURING RESISTANCE EXERCISE IN A REHABILITATION SETTING: ARE THEY SUPRA‐MAXIMAL?

The purpose of this study was to compare eccentrically induced force production during a rehabilitative eccentric resistance exercise to forces produced during a maximal isometric force exercise. Twenty‐three (13 female, 10 male) unimpaired, health professions graduate students participated in a single force‐testing session lasting 30 min. The testing session included lower extremity (LE) extension exercises on a recumbent ergometer (Eccentron, Denver, CO). The first two LE exercises consisted of maximal isometric efforts and the second two were characterized as “hard” eccentric efforts at 18 rpm. Forces at the footplate and knee joint angles were recorded. Results indicated that the average force during a “hard” eccentric effort (male: 444.11N ± 83.84, female: 257.92N ± 38.21) were 54% greater (p<0.001) than the force induced with a maximal isometric effort (male: 288.17 ± 52.71, female: 167.27N ± 29.46) regardless of sex or joint angle. Furthermore, the eccentric force (male: 315.16N ± 116.03, female: 194.71N ± 59.31) produced at the same knee joint angle as the maximum isometric force (male: 288.17N ± 52.71, female: 167.27N ± 29.46) were 13% greater (p<0.04). In conclusion, forces induced in the lower extremity during a “hard” eccentric resistance exercise effort, are 13‐54% greater than maximal isometric forces.