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One lumbar extension training session per week is sufficient for strength gains and reductions in pain in patients with chronic low back pain ergonomics [with consumer summary]
Bruce-Low S, Smith D, Burnet S, Fisher J, Bissell G, Webster L
Ergonomics 2012;55(4):500-507
clinical trial
5/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

Chronic low back pain (CLBP) is the leading cause of absenteeism from the workplace and research into exercise interventions to address this problem is required. This study investigated training frequency for participants with CLBP. Participants either trained once a week (1xweek, n = 31), or twice a week (2xweek, n = 20) or did not (control group, n = 21). Participants were isometric strength tested in weeks 1 and 12 and trained dynamically either 1xweek (80% of maximum) or 2xweek (80% and 50%). The results (pre versus post) showed significant increases in maximal strength, range of motion and reductions in pain for both training groups. Pain scores for the 1xweek and 2xweek both reached minimal clinical improvement change unlike the control group. Thus, one lumbar extension training session per week is sufficient for strength gains and reductions in pain in low back pain in CLBP patients.

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