Best Pract Res Clin Rheumatol. 2010 (Apr); 24 (2): 193–204 ~ FULL TEXT
Marienke van Middelkoop, PhD, Sidney M. Rubinstein, PhD, Arianne P. Verhagen, PhD, Raymond W. Ostelo, PhD, Bart W. Koes, PhD, Maurits W. van Tulder, PhD
Department of General Practice,
Erasmus Medical Center,
Rotterdam, the Netherlands.
Exercise therapy is the most widely used type of conservative treatment for low back pain. Systematic reviews have shown that exercise therapy is effective for chronic but not for acute low back pain. During the past 5 years, many additional trials have been published on chronic low back pain. This articles aims to give an overview on the effectiveness of exercise therapy in patients with low back pain. For this overview, existing Cochrane reviews for the individual interventions were screened for studies fulfilling the inclusion criteria, and the search strategy outlined by the Cochrane Back Review Group (CBRG) was followed.
Studies were included if they fulfilled the following criteria: (1) randomised controlled trials,(2) adult (> or =18 years) population with chronic (> or =12 weeks) nonspecific low back pain and (3) evaluation of at least one of the main clinically relevant outcome measures (pain, functional status, perceived recovery or return to work). Two reviewers independently selected studies and extracted data on study characteristics, risk of bias and outcomes at short-term, intermediate and long-term follow-up. The GRADE approach (GRADE, Grading of Recommendations Assessment, Development and Evaluation) was used to determine the quality of evidence.
In total, 37 randomised controlled trials met the inclusion criteria and were included in this overview. Compared to usual care, exercise therapy improved post-treatment pain intensity and disability, and long-term function. The authors conclude that evidence from randomised controlled trials demonstrated that exercise therapy is effective at reducing pain and function in the treatment of chronic low back pain. There is no evidence that one particular type of exercise therapy is clearly more effective than others. However, effects are small and it remains unclear which subgroups of patients benefit most from a specific type of treatment.
From the FULL TEXT Article:
Low back pain (LBP) is usually defined as pain, muscle tension or stiffness localised below the costal
margin and above the inferior gluteal folds, with or without leg pain (sciatica). LBP is typically classified as being ‘specific’ or ‘nonspecific’. Specific LBP refers to symptoms (such as hernia nucleus pulposus (HNP), infection, inflammation, osteoporosis, rheumatoid arthritis, fracture or tumour) caused by
a specific patho-physiologic mechanism.. Only in about 10% of the patients specific underlying diseases
can be identified . The vast majority of patients (up to 90%) are labelled as having nonspecific LBP,
which is defined as symptoms without a clear specific cause, that is, LBP of unknown origin. Spinal
abnormalities on X-rays and magnetic resonance imaging (MRI) are not strongly associated with
nonspecific LBP, because many people without any symptoms also show these abnormalities .
Nonspecific LBP is usually classified according to the duration as acute (less than 6 weeks), subacute
(between 6 weeks and 3 months) or chronic (longer than 3 months) LBP. In general, prognosis is
good and most patients with an episode of nonspecific LBP will recover within a couple of weeks.
However, back pain among primary-care patients is often a recurrent problem with fluctuating
symptoms. The majority of back pain patients would have experienced a previous episode and acute
exacerbations of chronic LBP are common. LBP is not only a tremendous medical problem, but also
a huge socioeconomic problem in Western countries due to high rates of disability and work absenteeism
. It is important to provide effective and cost-effective interventions to improve patient
outcomes and receive maximum benefits within available health-care budgets.
Evidence-based medicine has become increasingly more important over the past decade. The
management of LBP has been positively affected by the availability of more scientific research and
better use of critical appraisal techniques to evaluate and apply research findings . A large number of
systematic reviews are available within and outside the framework of the Cochrane Back Review Group
that have evaluated the therapeutic interventions for LBP [5, 6]. This large body of evidence has greatly
improved our understanding of what does and does not work for LBP. The evidence from trials and
reviews has formed the basis for clinical practice guidelines on the management of LBP that have been
developed in various countries around the world.
The management of LBP comprises a range of different intervention strategies, including surgery,
drug therapy and non-medical interventions. Exercise therapy is probably the most widely used type of
conservative treatment worldwide. This article summarises the state-of-the-art exercise therapy for
LBP. Exercise therapy might be provided as a single treatment or be part of a multimodal or multidisciplinary
treatment programme. Physiotherapists or specifically trained exercise therapists usually
provide exercise therapy. Some differences may exist between countries. For example, in the
Netherlands and Norway Mensendieck, therapists are officially registered exercise therapists. Exercise
therapy may be given individually or to groups of patients, under therapist’s supervision or consist of
home exercises, conducted using machines or not and on land or inwater. In addition, various types of
exercises exist, such as aerobic, flexion, extension, stretching, stabilising, balance/coordination and
muscle-strengthening exercises. Moreover, in the latter group, the exercises may focus on specific
muscles (e.g., transversus abdominus or multifidus) or a group of muscles (e.g., trunk, abdomen and
back). Finally, exercises may vary in intensity, frequency and duration.
Exercises for prevention of LBP
Nine reviews have been published that evaluated different types of physical exercise interventions
in the prevention of LBP. The reviews are essentially based on the same studies, although the most
recent reviews also included some recent trials. Eight reviews concluded that there is some evidence of
effect of exercise, but effect sizes were reported to be small to moderate [7–14]. One review concluded
that there was contradictory evidence that various general exercise/physical fitness programmes
reduce future LBP and work loss, and that any effect size was modest .
The two most recent systematic reviews of randomised trials on exercises for prevention of LBP had
somewhat different conclusions. One review on prevention at the workplace found strong evidence
that exercisewas effective in reducing the severity and activity interference from LBP and found limited
evidence supporting the use of exercise to prevent LBP episodes .
Another recent review included studies on prevention of back pain not only at the workplace but
also in any setting. The reviewfound strong, consistent evidence to guide prevention of LBP episodes in
working-age adults. The authors concluded that there is strong, consistent evidence that exercises are
effective, while other interventions are not, including stress management, shoe inserts, back supports,
ergonomic/back education and reduced lifting programmes .
The studies covered in the reviews included a variety of participants, used different exercise
schedules and measured a variety of health outcomes (e.g., duration and intensity of pain, disability
and work loss). The occupational populations varied widely and included military staff, nursing staff
and hospital employees, airline workers, office workers, postal workers, factory staff, railroad workers
and copper smelter employees. The control groups received either no intervention or information and
advice. The frequency and duration of the intervention programmes varied substantially, ranging from
an intensive ‘block’ programme (8 h daily for 5 weeks) to exercise sessions once per week for 18
months. The contents included instructions for back extensor training followed by regular training
sessions for 13 months, training of trunk flexors and general aerobic exercise.
All randomised trials were performed at the workplace or performed in work-specific cohorts, but
the contents of the programmes were not described as workplace specific and (in principle) could be
performed at the population level.
Most reviews concluded that exercise is effective in the prevention of LBP in working-adults and at
the workplace, but there is no consensus on the strength of the evidence. Some reviews concluded that
most studies were of high quality and have a low risk of bias , while others concluded that there
were various limitations and a high risk of bias in most studies . In conclusion, although exercise is
widely used at the workplace to prevent LBP, the evidence is not yet consistent and convincing. Future
trials are needed that should focus on identifying specific types and doses of exercise for specific
The Cochrane review by Hayden et al . included 11 trials (1192 subjects) on exercise therapy for
acute LBP. None of the randomised controlled trials (RCTs) found exercise therapy in health-care
settings to be effective for acute LBP. The meta-analysis showed no difference in short-term pain relief
between exercise therapy and no treatment (three trials), with an effect of–0.59 points on a 100-point
scale (95% confidence interval (CI),–12.69–11.51), and between exercise and other conservative
treatments (seven trials), with an effect of 0.31 points (95% CI,–0.10–0.72). Similarly, there were no
significant differences on functional outcomes. The authors found that independent exercise
programmes (i.e., home exercises) were less effective than the comparison group. Results were unclear
or there were no differences between therapist-delivered exercise programmes and the comparison
group (most commonly including advice to stay active). The authors concluded that there is strong
evidence that exercise therapy is not more effective than no treatment or other conservative treatments
for acute LBP.
Two recent papers summarised the quality and content of 25 international clinical guidelines on the
management of LBP [17, 18]. There seems to be consensus about the optimal management for acute LBP.
Recommendations for the treatment of acute LBP were rather consistent among the various international
reassure patients on the favourable prognosis, if available, and provide printed patient information;
advise patients to stay active;
discourage bed rest;
prescribe medication if necessary (preferably time contingent):
- non-steroidal anti-inflammatory drugs;
if patients do not improve, spinal manipulation is an option for pain relief.
Exercise therapy was not recommended for acute LBP in any of the guidelines.
Since the publication of the Cochrane review by Hayden et al. in 2005 , many additional trials
have been published on exercise therapy for chronic LBP. In this section, we describe the results of all
randomised trials on exercise therapy for chronic LBP.We included all trials of the Cochrane reviewand
updated the search in MEDLINE, EMBASE, CINAHL, CENTRAL and PEDro up to 22 December 2008. The
search strategy outlined by the Cochrane Back Review Group (CBRG) was followed. The following were
included: (1) RCTs,(2) adult (≥18 years) population with chronic (≥12 weeks) nonspecific LBP and (3)
evaluation of at least one of the main clinically relevant outcome measures (pain, functional status,
perceived recovery or return to work). Two reviewers independently selected additional studies and
extracted data on study characteristics, risk of bias and outcomes at short-term, intermediate and longterm
follow-up. The GRADE approach (GRADE, Grading of Recommendations Assessment, Development
and Evaluation) was used to determine the quality of evidence.
Thirty-seven studies (3957 patients) were included [19–55]. Multiple publications were found for
Bendix et al. 1995  and 1998 [56, 57], Gudavalli et al. [31, 58, 59], Niemisto¨ et al. [40, 60], and Smeets et
al [46, 61]. Information from all publications was used for the assessment of risk of bias and data
extraction; however, only the first or most prominent publicationwas used for citation of these studies.
The results of the risk of bias assessment are shown in Table 1. All studies were described as
randomised; however, the method of randomisation was only explicit in 75.7% (n =28) of the studies.
Only 15 studies (40.5%) met six or more of the criteria, which was our pre-set threshold for low risk of
bias. Only the criteria regarding the baseline characteristics, timing of outcome measures and
description of dropouts were met by 50% or more of the included randomised trials. A summary of
effect estimates for exercise therapy in chronic low back pain patients is presented in Table 2.
Exercise therapy versus waiting list controls/no treatment
Eight studies [19, 28, 29, 41, 45, 46, 48, 53] were identified as comparing some type of exercise therapy
to waiting list controls or no treatment. Five studies reported post-treatment data only, because after
the treatment period the waiting list controls also received the treatment. Only two studies [19, 46] had
intermediate or long-term follow-up.
The pooled mean differences were not statistically significant on post-treatment pain intensity
(–4.51 (95%CI–9.49; 0.47)), post-treatment improvement in disability (–3.63 (95%CI–8.89; 1.63)) and
pain intensity at intermediate follow-up (–16.46 (95%CI–44.48; 11.57)). Only one study (102 people)
reported intermediate outcomes for disability and long-term outcomes for pain intensity and disability.
There were no differences between the group receiving exercise therapy and the waiting list control
Therefore, there is low-quality evidence (serious limitations and imprecision) that there is no
statistically significant difference in pain reduction and improvement of disability between exercise
therapy and no treatment/waiting list controls for patients with chronic LBP.
Exercise therapy versus usual care
A total of six studies [27, 33, 40, 50, 54, 55] investigated the effect of exercise therapy compared to
usual care. Four of these studies had an intermediate or long-term follow-up. Statistical pooling of
three studies [27, 54, 55] showed a significant decrease in pain intensity and disability in favour of the
exercise group (weighted mean difference (WMD)–9.23 (95%CI–16.02;–2.43) and –12.35 (95%CI–
23.00;–1.69)), respectively. One study  reported on pain and disability at short-term follow-up, and
found no statistically significant differences between the exercise group and the control group
receiving home exercises. Two studies [27, 40] showed a statistically significant pooled WMD for
disability at intermediate follow-up of–5.43 (95%CI–9.54;–1.32). One study  found a statistically
significant difference at intermediate follow-up for pain relief for the exercise group compared to the
usual care group. Three studies [27, 50, 60] reported on pain and/or disability at long-term follow-up.
The pooled WMD for pain was not statistically significant (–4.94 (95%CI–10.45; 0.58)); the WMD for
disability was statistically significant in favour of the exercise group (WMD–3.17 (95%CI–5.96;–0.38)).
One study  reported recovery at post-treatment and during intermediate and long-term follow-up.
Therewas a statistically significant difference between the groups at 3 and 6months follow-up in favour of
the exercise group compared with usual care (p< 0.001). Eighty percent of the patients in the exercise
group regarded themselves recovered at 3 months follow-up as compared to 47% in the usual care group.
There is low-quality evidence (serious limitations and imprecision) for the effectiveness of exercise
therapy compared to usual care on pain intensity and disability.
Exercise therapy versus back school/education
Three studies with a high risk of bias were identified [24, 30, 49]. Post-treatment results for disability
were reported in two studies, with a significant pooled WMD of –11.20 (95%CI–16.78;–5.62). One study
reported on pain post-treatment and found no statistically significant difference between both intervention
groups . The pooled mean differences for pain and disability at 3 months follow-up
were–7.63 (95%CI–17.20; 1.93) and–2.55 (95%CI–10.07; 4.97), respectively.
Two studies [24, 30] reported intermediate outcomes on pain and three studies [24, 30, 44] reported
on disability. The pooled WMDs showed no statistically significant differences between the
groups:–5.58 (95%CI–16.65; 5.48) and–4.42 (95%CI–9.90; 1.05), respectively. Only one study (n = 346)
reported long-term outcomes, and these were not statistically significantly different between the
The data provided very low quality evidence (serious limitations, imprecision and inconsistency)
that there was no statistically significant difference in effect on pain and disability at short-term and
intermediate follow-up for exercise therapy compared to back school/education.
Exercise therapy versus behavioural treatment
Three studies, one with a low risk of bias, were identified comparing exercise therapy with
a behavioural treatment. [8, 32, 34] Two studies reported post-treatment pain and disability, and the
pooled WMDs were 1.21 (95%CI–5.42; 7.84) and 0.34 (95%CI–2.64; 3.31), respectively.
All three studies reported intermediate and long-term follow-up on pain intensity and disability. For
intermediate follow-up, the pooled WMDs for pain and disability were–2.23 (95%CI–7.58; 3.12) and
1.97 (95%CI–3.55; 7.48), respectively. Long-term results showed a pooled WMD for pain intensity
of–0.88 (95%CI–6.34; 4.58) and a pooled WMD for disability of 2.77 (95%CI–3.43; 8.96).
There is low-quality evidence (serious limitations and imprecision) that there are no statistically
significant differences between exercise therapy and behavioural therapy on pain intensity and
disability at short- and long-term follow-up.
Exercise therapy versus transcutaneous electrical nerve stimulation/laser therapy/ultrasound/massage
Five studies, two with a low risk of bias, were identified comparing exercise therapy with passive
therapies: transcutaneous electrical nerve stimulation (TENS), low-level laser therapy, ultrasound,
thermal therapy and ultrasound [21, 23, 32, 35, 54]. The pooled WMDs for post-treatment pain intensity
and post-treatment disability were–9.33 (95%CI–18.80; 0.13) and–2.59 (95%CI–8.03; 2.85), respectively.
Two studies [23, 54] reported on short-term pain intensity and disability, and the pooled mean
differences were 1.72 (95%CI–6.05; 9.50) and 1.02 (95%CI–0.38; 2.42), respectively. One study with
a low risk of bias  reported intermediate and long-term outcomes, and found a statistically
significant difference for pain intensity of 16.8 and 21.2 points, respectively, in favour of exercise
therapy. In addition, a statistically significant difference was found for disability.
Low-quality evidence (serious limitations, inconsistency and imprecision) that there is no statistically
significant difference in effect between exercise therapy compared to TENS/laser/ultrasound/
massage on the outcomes pain and disability at short-term follow-up has been provided.
Exercise therapy versus spinal manipulation
Five studies, two with a low risk of bias, were identified comparing exercise treatment with spinal
manipulation or manual therapy [26, 30, 31, 39, 52]. Post-treatment data were available for three
studies. The pooled WMDs for pain intensity and disability were 5.67 (95%CI 1.99; 9.35) and 2.16
(95%CI–0.96; 5.28), respectively. One study reported a statistically significant difference in global
perceived effect post-treatment  in favour of spinal manipulation. Two studies reported shortterm
effects on pain intensity and disability, and the pooled WMDs were–1.33 (95%CI–10.11; 7.79)
and 0.29 (95%CI–3.15; 3.72), respectively [30, 31]. Intermediate results on pain and disability were
reported by three studies [26, 30, 31], and the pooledWMDs were–0.49 (95%CI–12.22; 11.23) and 2.38
(95%CI–5.16; 9.93), respectively. All the studies reported long-term results on disability and the
pooledWMD–0.70 (95%CI–3.14; 1.74). Four studies reported long-term results on pain intensity, and
the pooled WMD was 2.09 (95%CI–2.94; 7.13). Global perceived effect was reported by one study
during intermediate and long-term follow-up. No statistically significant between-group differences
were found in this study .
The data provided low-quality evidence (inconsistency and imprecision) that there was no statistically
significant difference in effect (pain intensity and disability) for exercise therapy compared to
manual therapy/manipulation at short- and long-term follow-up.
Exercise therapy versus psychotherapy
One study with a high risk of bias was identified . Post-treatment results showed a statistically
significant difference in disability scores between both groups in advantage of the exercise group. No
post-treatment differences between both groups were found for pain intensity. At 6 months follow-up,
both disability and pain intensity scores were lower in the exercise group compared to the psychotherapy
group, but not statistically significant.
Exercise therapy versus other forms of exercise therapy
Eleven studies compared different exercise interventions with each other [25, 26, 34, 36, 38, 42–44, 47, 51, 53]. Data of these studies could not be pooled because of the heterogeneity of the types of
Two studies found statistically significant differences between different exercise interventions. One
study , with a high risk of bias, reported statistically significant difference in pain relief at 3 months
follow-up of an aerobic exercise training programme compared with a lumbar flexion exercise programme
of 3 months. One large trial  with a low risk of bias (n = 240) compared a general exercise
programme (strengthening and stretching) with a motor control exercise programme (improving
function of specific trunk muscles) of 12 weeks. The motor control exercise group had slightly better
outcomes (mean adjusted between-group difference function being 2.9 and global perceived effect 1.7)
than the general exercise group at 8 weeks. Similar group outcomes were found at 6 and 12 months
A total of nine studies did not find any statistically significant differences between the various
exercise interventions . Sherman et al . compared a 12-week yoga (viniyoga) programme with
a 12-week conventional exercise class programme. Back-related function in the yoga group was
superior to the exercise group at 12 weeks.
The effectiveness of the different treatment strategies
No significant treatment effects of exercise therapy compared to no treatment/waiting list controls
were found on pain intensity and disability. Compared to usual care, pain intensity and disability were
significantly reduced by exercise therapy at short-term follow-up. Adverse events were not reported in
any of the included studies.
The Cochrane review, published in 2005, on the effectiveness of exercise for LBP found evidence for
the effectiveness on pain and function in chronic patients . We also found evidence for the
effectiveness for exercise therapy compared to usual care. However, we applied strict inclusion criteria
regarding chronic LBP, so our meta-analyses not only excluded some of the studies included in the
Cochrane review, but included some new studies as well. Nevertheless, results are comparable despite
the new studies that are conducted in the recent years. It is therefore also striking that the quality of the
included studies was still generally poor.
This overview included 11 studies comparing different types of exercise treatments with each other.
Very small to no differences were found in these studies. A recent review on the outcome of motor
control exercises on nonspecific LBP concluded that motor control exercise is superior to minimal
intervention, but is not more effective than manual therapy . Only two of the 11 included studies
comparing different forms of exercises found statistically significant differences between the exercise
groups. One study found aerobic exercises  and another study preferred motor control exercises to
be more effective than the control .
None of the significant differences found in this overview study reached a difference >10%, where in
most studies a difference of 15–20% is defined as clinically relevant. Therefore, the differences found in
this overview must be regarded as small and not clinically relevant.
Of particular note is the heterogeneity among the studies. This heterogeneity could have been
caused by differences in interventions, differences in control groups, duration of the intervention and
the risk of bias of the different studies. Therefore, the results of the meta-analyses with heterogeneity
should be interpreted with some caution.
The methodological quality of the studieswas generally poor resulting in a high risk of bias. Blinding
of the patient and blinding of the care provider were not properly conducted in many studies. Blinding
of patients is also difficult in many RCTs investigating the effectives of exercise therapy. The quality of
future RCTs in the field of back pain should be improved to reduce bias in systematic reviews and
overviews, as it has been demonstrated that statistical pooling of trials with a high risk of bias may
result in overestimation of treatment effects. Further research is very likely to have an important
impact on our confidence in the estimate of effect and is likely to change the estimate. These studies
should focus on specific populations and should be well described. Further, more studies are needed to
investigate the different forms of exercise interventions and, finally, the description of these studies
should include the compliance and co-interventions of the study groups.
Implications for practice
Exercise therapy seems to be effective for the prevention of LBP, but only few recent trials are
conducted. This therapy is not effective for acute LBP, whereas it is effective for chronic LBP; however,
there is no evidence that any type of exercise is clearly more effective than others. Subgroups of
patients with LBP might respond differently to various types of exercise therapy, but it is still unclear
which patients benefit most from what type of exercises. Adherence to exercise prescription is usually
poor, so supervision by a therapist is recommended. If home exercises are prescribed, strategies to
improve adherence should be used. Patient’s preferences and expectations should be considered when
deciding which type of exercise to choose.
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