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Influence of Relative Strength on Functional Independence of Patients With Spinal Cord Injury.
OBJECTIVE: To investigate the influence of strength values and fat mass on functional independence of men with different spinal cord injury (SCI) levels.
DESIGN: Cross-sectional study.
SETTING: Hospital network.
PARTICIPANTS: Men with SCI (N=45).
INTERVENTIONS: Subjects were assessed in functional independence scales, a 1 repetition maximum (1RM) test, and body composition to detect absolute and relative strength: 1RM divided by body mass (BM) and lean body mass (LBM), respectively.
MAIN OUTCOME MEASURES: Stepwise multiple regression analysis was used to verify the influence of predictors on functional independence (FIM and Spinal Cord Independence Measure [SCIM] scale and subscales). Receiver operating characteristic curves were created to identify cutoff points of strength for functional independence.
RESULTS: The best models for FIM total, FIM mobility, and SCIM total used 1RM as the best predictor (adjusted R2 =.75, .67, and .65, respectively; P<.05). Relative strength (1RM/LBM) was the best predictor for SCIM mobility (adjusted R2 =.62, P<.05). A FIM score of 69 has a 1RM cutoff point of 50.1kg, and a FIM score of 76 has cutoff points of .73 for 1RM/BM and .91 for 1RM/LBM. A SCIM score of 68 has cutoff points for 1RM, 1RM/BM, and 1RM/LBM of 50.1kg, .77, and .92, respectively.
CONCLUSIONS: Cutoff points of relative strength should be used as determinant variables for independence, health, or sports performance. This study may contribute to more adequate guidance of physical activity during a rehabilitation program and after discharge.
DESIGN: Cross-sectional study.
SETTING: Hospital network.
PARTICIPANTS: Men with SCI (N=45).
INTERVENTIONS: Subjects were assessed in functional independence scales, a 1 repetition maximum (1RM) test, and body composition to detect absolute and relative strength: 1RM divided by body mass (BM) and lean body mass (LBM), respectively.
MAIN OUTCOME MEASURES: Stepwise multiple regression analysis was used to verify the influence of predictors on functional independence (FIM and Spinal Cord Independence Measure [SCIM] scale and subscales). Receiver operating characteristic curves were created to identify cutoff points of strength for functional independence.
RESULTS: The best models for FIM total, FIM mobility, and SCIM total used 1RM as the best predictor (adjusted R2 =.75, .67, and .65, respectively; P<.05). Relative strength (1RM/LBM) was the best predictor for SCIM mobility (adjusted R2 =.62, P<.05). A FIM score of 69 has a 1RM cutoff point of 50.1kg, and a FIM score of 76 has cutoff points of .73 for 1RM/BM and .91 for 1RM/LBM. A SCIM score of 68 has cutoff points for 1RM, 1RM/BM, and 1RM/LBM of 50.1kg, .77, and .92, respectively.
CONCLUSIONS: Cutoff points of relative strength should be used as determinant variables for independence, health, or sports performance. This study may contribute to more adequate guidance of physical activity during a rehabilitation program and after discharge.
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