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The effect of a 6-week program of isolated back extension strength training on lifting capacity : comparison of an isokinetic vs. isotonic training regimen / Jeffery R. Heintz

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Identifier	Thesis 1492
Author	Heintz, Jeffrey R
Title	The effect of a 6-week program of isolated back extension strength training on lifting capacity : comparison of an isokinetic vs. isotonic training regimen / Jeffery R. Heintz
Publisher	Central Connecticut State University
Date	1998
Resource Type	Master's Thesis
Notes	Identifying optimal strength training programs for increasing lifting capacity is of paramount importance to clinicians attempting to improve function and decrease the risk of low back injuries in their patients. The purpose of this study was to evaluate whether an isolated back extension strengthening program would increase lifting capacity and back extension strength in a healthy population. Isokinetic and isotonic exercises were employed to determine which method would produce greater strength gains. Twenty subjects were randomly assigned to one of three groups: control group (six subjects), isokinetic group (seven subjects), isotonic group (seven subjects). All subjects were pretested over a two day period for lifting capacity. The following devices were employed: a dynamic lifting test using an oak box with calibrated weights, isokinetic lifting test utilizing the Cybex Lift Task unit at 24o and 30o per second, isometric lifting test at 10" off the ground on the Cybex Lift Task platform. Back extension strength gains were tested using the Cybex isokinetic TEF unit at 60-90-120o per second. Isotonic strength was measured using a 10 RM test on the Cybex Eagle unit. The isokinetic group underwent a six week progressive program of back extension exercises at 60-90-120o per second. The isotonic group performed a three time per week back extension strength program based on a modified daily adjustable progressive resistive exercise program (D.A.P.R.E.). Control group members performed no exercise. All subjects were counseled not to change their activity level. At the end of six weeks, all subjects were retested on the all five dependent variables. Data were analyzed by means of a 3 x 2 ANOVA (groups x trials) with repeated measures on the second factor for each of the five tests. Post hoc multiple comparison tests were performed using Tukeys HSD when a significant F ratio was present. The level of significance was set at p <. 05. The results of data analysis for dynamic box lifting revealed a significant p <. 05. increase in lifting capacity for the isokinetic group (28%) and the isotonic group (23%). Post hoc analysis revealed a significant difference between the isokinetic and the isotonic groups. For isokinetic testing there was a significant increase for both the isokinetic and isotonic groups. However, there was no significant group x trail interaction. On the isometric lifting test the group x trial interaction was significant. Post hoc analysis revealed significant differences between treatment groups and the control group, but no significant difference between the isokinetic group (14% increase) and the isotonic group (8% increase). Only the isokinetic group made significant gains. Concentric isokinetic back extension strength increased by 13% for isokinetic subjects for 14% for the isotonic subjects, although there was no significant interaction of groups x trials. Isotonic back strength data revealed significant increases of 31 % for the isokinetic group and 30% for the isotonic group. Post hoc analysis revealed no significant difference between the two treatment groups. The results indicate that a six week isokinetic or isotonic back extension strengthening program will increase lifting capacity. The data indicates that the isokinetic training method provides a significant (albeit slight advantage) over traditional isotonic back extension exercises for a functional lifting task and an isometric lift. However, the same advantage was not evident in the results from the isokinetic lifting test. Isokinetic testing devices did not identify significant increases in lifting capacity as well as the dynamic test for either treatment group. Both the isokinetic mid-range velocity spectrum protocol and isotonic D.A.P.R.E. program were effective at increasing back extensor strength compared to the control. However, the results indicate no distinct advantage of either method over the other
Subject	Isokinetic exercise Back exercises Lifting and carrying -- Back exercises
Department	Department of Physical Education and Human Performance
Advisor	Trichka, Robert E
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	40254160
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The effect of a 6-week program of isolated back extension strength training on lifting capacity : comparison of an isokinetic vs. isotonic training regimen / Jeffery R. Heintz

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