OBJECTIVE: To evaluate a 10-week training program for improved lumbo-pelvic stability (LPS), and to investigate the impact of improved LPS on athletic performance. DESIGN: Randomized-controlled study. SETTING: Testing was done at the University of British Columbia, Vancouver. Training was at colleges and universities in the immediate vicinity to Vancouver, Canada. PARTICIPANTS: Thirty female varsity volleyball and basketball players aged 18 to 23 yrs were randomly assigned to treatment (T), pseudo-treatment (PT), or control (C). MAIN OUTCOME MEASURES: For LPS the participants lied supine and the position of the pelvis and lumbar spine was monitored using a stabilizer Pressure Biofeedback Unit (PBU) while load was progressively added by movements of the lower limbs. T-test, Sargent's, and Bass' tests assessed agility, leg power, and balance, respectively. RESULTS: Non-parametric Friedman, Wilcoxon and Mann-Whitney techniques detected LPS improvement in T (2.8 +/- 1.5) and PT (2.3 +/- 1.4). Repeated measures ANOVA detected improvement in the agility (8.8 +/- 0.7 s) and leg power (32.3 +/- 4.5 cm) of T, and in the static balance ability of all three groups. Regression using Spearman's rho revealed no significant correlations between the post-test scores for LPS and athletic performance, or between pre- to post-test changes in LPS was improved following training in the T and PT groups. While improvements in agility and leg power were limited to only the T group, there was no association between improvements in LPS and improvements in athletic performance. CONCLUSION: The PBU may be an important tool in identifying lumbo-pelvic instability, however, its use is not recommended in the evaluation of treatment efficacy.

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