Randomized trial of general strength and conditioning versus motor control and manual therapy for chronic low back pain on physical and self-report outcomes

Key points

1. 01Both groups reduced pain intensity at 6 months, but neither reached the 20 mm clinically meaningful change on the VAS
2. 02General strength and conditioning (GSC) produced significantly greater gains in trunk extension and flexion endurance, leg strength, and leg endurance compared to motor control and manual therapy (MCMT)
3. 03GSC reduced disability and kinesiophobia more than MCMT at both 3 and 6 months
4. 04MCMT showed faster early pain relief at weeks 14 and 16, but this advantage disappeared by 6 months
5. 05Multifidus volume increased within the GSC group only, but no between-group difference was found

How it was conducted

Design

Randomized controlled trial, 6-month intervention, intent-to-treat analysis

Participants

40 adults aged 25-45 with non-specific chronic low back pain (>3 months), pain 2-8/10 NRS, excluded if doing more than 150 min/week of moderate-vigorous exercise

Groups

GSC: up to 52 supervised gym sessions over 6 months (n=20); MCMT: up to 12 physiotherapy sessions of motor control exercise and manual therapy (n=20)

Primary outcomes reported here

Pain intensity (VAS 0-100 mm), trunk and leg endurance, leg strength, cardiorespiratory fitness, paraspinal muscle volume by MRI, disability (Oswestry), kinesiophobia (Tampa scale), quality of life (SF-36)

Follow-up

Baseline, 3 months, and 6 months; fortnightly pain questionnaires throughout

What they found

• Pain intensity: both groups improved within-group at 6 months - GSC mean change -10.7 mm (95% CI -18.7 to -2.8, p=0.008); MCMT -19.2 mm (95% CI -28.1 to -10.3, p<0.001); neither reached the 20 mm clinically meaningful threshold
• Between-group pain: MCMT favored at weeks 14 and 16 only (both p=0.003); no between-group difference at 6 months
• Trunk extension endurance at 6 months: GSC gained 133.7 s vs MCMT 51.8 s; net difference 81.8 s (95% CI 34.8 to 128.8, p=0.004) favoring GSC
• Trunk flexion endurance at 6 months: net difference 51.5 s (95% CI 20.5 to 82.6, p=0.004) favoring GSC
• Leg press 1-RM at 6 months: net difference 24.7 kg (95% CI 3.4 to 46.0, p=0.023) favoring GSC
• Leg press endurance at 6 months: net difference 9.1 reps (95% CI 1.7 to 16.4, p=0.015) favoring GSC
• Cardiorespiratory fitness: favored GSC at 3 months only (net difference 3.2 mL/kg/min, 95% CI 0.4 to 6.0, p=0.025); no between-group difference at 6 months (net difference 1.3, 95% CI -1.6 to 4.2, p=0.380)
• Oswestry Disability Index at 6 months: net difference -5.7 pts (95% CI -11.2 to -0.2, p=0.041) favoring GSC; within-group change for GSC -13.5 pts exceeded the 10-point clinically meaningful threshold
• Tampa Kinesiophobia at 6 months: net difference -6.6 pts (95% CI -9.9 to -3.2, p<0.001) favoring GSC
• Multifidus volume: within-group increase for GSC at 6 months (p=0.003); no between-group difference (net difference 0.6 cm3, 95% CI -0.1 to 1.4, p=0.116)
• SF-36 physical and mental health: no between-group differences at any time point
• Dropout: 8 of 40 participants (20%); MCMT n=5 (25%), GSC n=3 (15%)

Limitations

• Small sample size (n=40 total) limits statistical power and generalizability; 469 screened to include only 40 means results may apply only to a narrow subset of people with chronic low back pain
• The two groups had different numbers of sessions and face-to-face clinician time, making it difficult to isolate which component drove the differences
• Home exercise adherence could not be reported due to poor diary completion, so actual exercise dose is uncertain
• Sub-group matching was not done, meaning some MCMT participants may not have had hypomobility that would benefit from spinal manipulative therapy, potentially underestimating MCMT effects

Why it matters

For patients

People with chronic low back pain doing a supervised gym program can expect broader improvements in strength, endurance, and fear of movement, though neither this nor physiotherapy-led therapy reliably eliminates pain within 6 months.

For clinicians

When the treatment goal extends beyond pain reduction to include functional capacity and kinesiophobia, a periodized general strength and conditioning program produces larger and more diverse benefits than motor control exercise with manual therapy over 6 months.

For readers

This small RCT challenges the assumption that pain reduction is the best single measure of treatment success, showing that exercise type matters for functional and psychological outcomes even when pain outcomes converge.