Effectiveness of a standardised exercise programme for recurrent neck and low back pain: a multicentre, randomised, two-arm, parallel group trial across 34 fitness clubs in Finland.

BACKGROUND: Neck and low back pain (LBP) are common in office workers. Exercise trials to reduce neck and LBP conducted in sport sector are lacking. We investigated the effectiveness of the standardised Fustra20Neck&Back exercise program for reducing pain and increasing fitness in office workers with recurrent non-specific neck and/or LBP.
METHOD: Volunteers were recruited through newspaper and Facebook. The design is a multi-centre randomised, two-arm, parallel group trial across 34 fitness clubs in Finland. Eligibility was determined by structured telephone interview. Instructors were specially educated professionals. Neuromuscular exercise was individually guided twice weekly for 10 weeks. Webropol survey, and objective measurements of fitness, physical activity, and sedentary behavior were conducted at baseline, and at 3 and 12 months. Mean differences between study groups (Exercise vs Control) were analysed using a general linear mixed model according to the intention-to-treat principle.
RESULTS: At least moderate intensity pain (≥40 mm) in both the neck and back was detected in 44% of participants at baseline. Exercise compliance was excellent: 92% participated 15-20 times out of 20 possible. Intensity and frequency of neck pain, and strain in neck/shoulders decreased significantly in the Exercise group compared with the Control group. No differences in LBP and strain were detected. Neck/shoulder and trunk flexibility improved, as did quality of life in terms of pain and physical functioning.
CONCLUSIONS: The Fustra20Neck&Back exercise program was effective for reducing neck/shoulder pain and strain, but not LBP. Evidence-based exercise programs of sports clubs have potential to prevent persistent, disabling musculoskeletal problems.

RCT Entities:   Population Interventions Outcomes

High compliance to exercise and lack of adverse effects support the use of exercise concepts such as Fustra in sport/fitness clubs.

The Fustra concept was effective in reducing neck pain, but there is need to improve the exercises for low back pain.

Workplaces and insurance companies might have an interest to financially support private sports sector in providing evidence-based exercise programmes to their employees.

Introduction

Background

Office work is a sedentary work and may require sitting for long hours at a computer, working in awkward positions or performing repetitive manual tasks.1 Neck pain and low back pain (LBP) are significant health problems in office workers, with neck pain being most common among all office workers.2 3 Development of chronic pain is common,4 and nearly one-third of patients with LBP do not completely recover within 12 months after the onset of pain.5 Both neck pain and LBP cause personal suffering, disability and impaired quality of work and life in general,6 placing a great socioeconomic burden on patients and society.7 8

In office workers, several individual risk factors, including older age, female sex, high body mass index, lack of physical exercise, smoking, alcohol consumption and previous symptoms, are associated with neck pain.9 In addition, women and men with sickness absences due to musculoskeletal diagnoses have an increased risk of premature death,10 11 which is attributed to physical inactivity-related non-communicable diseases (ie, cardiometabolic diseases and cancer).12 13

Exercise is one of the most commonly applied treatment choices for non-specific neck pain and LBP, but evidence regarding its effectiveness in non-specific recurrent patient groups is scarce, especially for those with neck pain. The most recent systematic review14 did not include findings on patients with recurrent neck pain and reported no high-quality evidence for the effectiveness of exercise for chronic neck pain. Strengthening and endurance exercises for neck/shoulder problems may be beneficial for reducing pain and improving function.14 Post-treatment exercise can reduce the recurrence of LBP, but the details of an effective exercise programme have not been specified.15 Although motor control exercises are reported to decrease the risk of recurrence at 1 year, the quality of the evidence is very low.16

Objectives

The aim of this study was to examine the effectiveness of a standardised exercise programme for reducing pain and improving fitness in office workers with recurrent non-specific neck pain and/or LBP in 34 commercial fitness clubs located in different parts of Finland. We also evaluated the effects on local musculoskeletal strain, fear avoidance beliefs, health-related quality of life and work ability. The hypothesis was that the Fustra20Neck&Back neuromuscular exercise programme will improve the control of posture and movement, neck/shoulder and trunk flexibility, trunk muscular endurance, and leg strength, and thus decrease pain intensity by 30%, compared with the non-exercise group.

Methods

Study design, settings and participants

The study design was a multicentre, randomised, two-arm, parallel group trial where the individuals were randomised within 34 commercial fitness clubs (clusters) around Finland that provide standardised Fustra20Neck&Back exercise programmes and agreed to take part in the study. Recruitment of study participants began with an advertisement in a nationally distributed newspaper in Finland, and volunteers contacted the UKK Institute, Tampere, Finland, by phone or email. Websites (Facebook) of both the UKK Institute and local fitness clubs were used to reach more people.

A structured telephone interview was conducted by experienced research nurses of UKK Institute to screen the eligibility of the participants. Based on these, two senior researchers (JHS, MR) of UKK Institute made the final selection of participants. The inclusion and exclusion criteria for eligibility are presented in box 1.

Sedentary office worker, sitting at least 6 hours/day

Women or men, 30–50 years of age

Pain in the neck or/and lower back of at least moderate intensity (ie, ≥3 in a Numeric Rating Scale from 0 to 10)17 in the past 4 weeks

At least two episodes of pain (neck or/and low back) in the past year

Chronic neck or/and low back pain defined as continuous pain over 12 months

Serious former injury in the neck or low back (fracture, surgery, whiplash, protruded disc)

Current engagement in neuromuscular exercise at least three times a week

Current engagement in competitive sports

Pregnant or recently had a baby (<6 months)

Intervention

Exercise instructors were professionals (physiotherapists, or persons with a bachelor's degree in sports studies) with special training in the Fustra20Neck&Back programme, which is an individually guided, progressive standardised neuromuscular exercise programme. The exercise dose was twice a week for 10 weeks (ie, 20 sessions). Each exercise session lasted 1 hour, and comprised 10 min aerobic warm-up with a cross trainer, 10 functional flexibility exercises (see online supplementary file 1) 4 strength and 5 core exercises (see online supplementary file 2), and a 10 min cool down, including instructor-assisted stretching. Participants were encouraged to continue exercising at home according to the plan provided by their personal instructor after the 10-week training period. The main aims and training principles of the Fustra20Neck&Back are presented in box 2.

improve body posture

enhance movement control of shoulder-neck, lumbar and pelvic areas

enhance stability of shoulder-neck, lumbar and pelvic areas

increase flexibility of neck/shoulder area

increase range of motion of thoracic spine with main emphasis on rotation

increase muscular strength and/or endurance of upper-body, trunk and lower extremities

use of functional exercises, that is, gross movement of the whole body kinetic chain

applying the following principles of body alignment to each exercise when appropriate:

standing feet forward and apart using a light foam ‘block’ (23 cm × 15 cm × 8 cm) between the feet with weight distributed equally on both feet18

neutral alignment of hips, knees and ankles, that is, avoiding excessive hip adduction or knee valgus18

no pelvic tilt forward, backward or sideways, that is, neutral pelvic posture18 19

maintaining neutral posture (ie, zone) in cervical20 and lumbar21 spine

avoiding forward head and rounded shoulder posture22

applying a specific breathing technique to each exercise (see instructions in online supplementary files 1 and 2)

The exercise instructors kept a diary for each participant regarding compliance and amount of each exercise during the 20 sessions. The participants were allowed to keep the training equipment (stick and foam block) for home exercise. Participants allocated to the control group were asked to continue their usual physical activity and exercise habits. After the final measurements at 12 months, controls were given the opportunity to participate in the Fustra20Nec&Back exercise programme five times and also received the training equipment.

Measurements and procedures

The study measurements, described in table 1, were conducted at baseline, and at the 3-month and 12-month follow-up. The main outcome measure was intensity of pain measured with Visual Analogue Scale (VAS)23 for both the neck and low back. Questionnaire data were collected by the UKK Institute in an electronic form by sending the participants an email (and two later notices if needed) with a personal link to access the online survey tool Webropol. The pretesting health screening24 and fitness testing were conducted at the local clubs by Fustra professionals who were not instructing the interventions. The screeners received a text message from the UKK Institute's research secretary (TI) with the names and phone numbers of the participants to be tested, and then made appointments for each individual. New text messages were sent before the measurements at 3 and 12 months to remind them to make new appointments. All data gathered at the fitness clubs (including copies of the exercise diary) were mailed to the research secretary, who later saved it in an electronic form using only the identification codes of the study participants. The UKK Institute sent feedback to each participant of both study groups regarding the individual fitness test results, physical activity and sedentary behaviour after the 3-month and 12 month follow-up measurements.

Table 1

Description of the main outcomes and other measurements of the study

Measurement item	Assesment scale
Musculoskeletal pain and activity limitations
Intensity of neck/low back pain in the past month23	Visual Analogue Scale: 0–100 mm
Frequency of neck/low back pain in the last 4 weeks17	0=no pain; 1=now and then; 2=most days of week, but not daily; 3=daily
Radiating pain: from neck to arm/lower back to leg17	0=no; 1=yes
Activity limitations due to neck/low back pain17	0=no; 1=yes
Perceived local musculoskeletal strain after the work day during the past month assessed for neck, shoulder, upper back, lower back, knee and hip38	Numeric Rating Scale 0–6, with manikin illustrating the body regions: 0=not at all; 6=very much
Pain-related fear avoidance beliefs39 towards physical activity	Five standard questions with Numeric Rating Scale 0–6: 0=disagree; 6=quite agree; total score 0–30
Health-related quality of life40 with Finnish reference values31	RAND-36 Item Health Survey (RAND-36): score 0–100 for the eight subscores
Work Ability Index (WAI),41 Short Form	Total sum score of WAI Short Form: 3–27
Current work ability compared with the lifetime best	Numeric Rating Scale 0–10: 0=not capable at all; 10=best possible
Work ability in relation to physical work demands	1=very poor; 2=poor; 3=average; 4=good; 5=very good
Work ability in relation to mental work demands
Personal prognosis of work ability 2 years from now	1=hardly; 4=not sure; 7=almost certainly
Physical fitness tests
Stand on one leg for static balance*42	Score 0–60 s (best of 2 trials)
Neck-shoulder mobility (sagittal movement)*42	Sum score (2–6) right + left sides: 1=severe limitation; 2=some limitation; 3=no limitation
Trunk side-bending for spinal flexibility*42	Mean of right and left side bending, cm
Modified push-ups for upper-body strength and ability during to stabilise trunk*42	Number of correctly performed push-ups 40 s
Static squat against the wall	Endurance score 0–90 s
6 min walk test43	Distance walked in 15 m indoor track
Physical activity and sedentary behaviour
Questionnaire developed to evaluate the fulfilment of current physical activity recommendations for health44 regarding aerobic and muscular type of activity	National Institute for Health, health and well-being for residents research forms: http://www.thl.fi/attachments/ATH/2013A1204_4.pdf
Objective assessment with accelerometer for 7 days (minimum of 4 days and 10 daily hours)24 25	Waist-worn accelerometer (Hookie AM 20, Traxmeet, Espoo, Finland) using digital triaxial acceleration sensor (ADXL345; Analog Devices, Norwood, Massachusetts, USA) ±16 g

*A test manual and video for fitness testing is available at http://www.ukkinstituutti.fi/en/alpha.

Physical activity, standing still and sedentary behaviour (lying, sitting) were measured objectively by accelerometers and analysed with methods25 26 developed by the UKK Institute. In standardised conditions, standing can be separated from sitting or lying with 100% accuracy, and sitting from lying with 95% accuracy.27 The research secretary mailed the accelerometers to the participants with instructions to place it on the right hip using a flexible belt and to wear it for seven consecutive days during waking hours, except while showering and other water activities. The accelerometers were returned by mail to the UKK Institute, where the data were analysed.

Randomisation and blinding

The individual study participants at the 34 fitness clubs (clusters) were randomised immediately after the baseline measurements into exercise or control group within each location/club (ie, individual randomisation). Randomisation of the participants was conducted by a statistician (KT) who was blinded to any participant identification information other than the study code. First Microsoft Excel (2010) was used to generate a random number for each participant with RAND() function. Second, within each fitness club (cluster) roughly 50% of participants with the highest random number were assigned to the intervention group and 50% with the lowest random number to the control group. The exercise leaders at each club received a text message from the UKK Institute's research secretary (TI) with the names and phone numbers of the participants in the exercise group, and then made appointments for the first exercise session.

The research secretary was the only person with access to participant identification information other than the study code. The statistician and researchers were blinded to the group allocation until the end of the statistical analysis. The professionals conducting the fitness tests at each club were blinded to the group allocation at baseline, but the participants may have revealed their group during the follow-up fitness tests. The exercise instructors and participants were aware of the group allocation.

Power calculation and statistical analyses

The original plan was to have a total of 175 participants of 30 clubs (ie, mean of 5.8 participants/club) (see ClinicalTrials.gov NTC02235207). The final power calculations were based on the actual number of fitness clubs (clusters) that were willing to participate (n=34) given that they would have volunteer participants fulfilling the eligibility criteria. Power calculations were carried out using the ‘cluster randomization power analysis’ procedure28 in PASS 11 (Power Analysis and Sample Size, NCSS, Kaysville, Utah, USA). A sample size of 34 clusters per group (exercise, control) with an average of 2.4 individuals per group (ie, 4.8 per club, a total of 163 participants) achieves 80% power to detect a difference of 10.0 mm in the VAS score between the group means when the SD is 25.0 and the intracluster correlation is 0.03 using a one-sided t-test with a significance level of 0.05. Due to the probable dropout at different study phases, the aim was to recruit 180 participants.

Descriptive results are presented as proportions or means with SD. The differences between the groups at baseline were analysed by independent sample t-test, χ2test or Mann-Whitney U test. The mean difference between the two study groups (exercise vs control) at the three measurement points was analysed by a general linear mixed model (GLMM) using the IBM SPSS V.22 statistics software. All analyses were first adjusted for age, sex, weight and height, and second for civil status, education level, smoking habit and perceived fitness. Only those confounding factors that improved the model in the second stage in the sense of Bayesian information criteria were included in the final GLMM. Continuity corrected CIs for proportions were calculated with the statistical software R29 function prob.test. All analyses were performed according to the intention-to-treat principle.

Results

A total of 823 people contacted the UKK Institute as interested participants; 190 were further screened, 176 were accepted for the study and 1 withdrew prior to randomisation. Five participants were excluded after baseline measurements due to insufficient data. The final exercise group included 87 participants and the control group included 83 participants. The study protocol and flow of participants at different stages of the study are presented in figure 1.

Figure 1

Study protocol and the flow of participants at different stages of the study.

The participant characteristics are presented in table 2. The mean age was 41 years, and the majority of the sedentary office workers were women, married/cohabitating and had a higher than average level of education. The measured daily sitting time was 8 hours and 48 min on workdays. There was only one statistically significant difference between the study groups: compared with control, a lower proportion of exercise group perceived their fitness to be higher or much higher than their same-age peers (14.8% vs 27.8%, p=0.04). Regarding physical activity guidelines (see table 2), smaller, non-significant differences were detected for physical inactivity and meeting the muscular exercise recommendation for health.30

Table 2

Background characteristics of the participants by study group

Characteristics	Study groups
	Exercise (n=87)	Control (n=83)	All (n=170)	p Value	Missing (n)
Age: years (mean, SD)	40.7 (6.0)	41.6 (5.7)	41.1 (5.9)	0.361	0
Sex: female	80.5%	78.3%	79.4%	0.972	0
Civil status: married/cohabiting	83.7%	80.7%	82.4%	0.592	0
Education: secondary school graduate	79.3%	81.9%	80.6%	0.672	0
Professional degree: polytechnic or higher	63.2%	65.1%	64.1%	0.802	0
Smoking: non-smoker	80.5%	88.0%	84.1%	0.182	0
Elevated blood pressure (self-report): yes	9.9%	4.0%	7.4%	0.352	8
Dizziness (self-report): yes	13.6%	13.6%	13.6%	1.002	8
Use of medication (self-report): yes	23.5%	27.2%	25.3%	0.592	8
Perceived fitness compared with same-age peers
Higher or much higher	14.8%	27.8%	21.3%	0.0402	3
Lower or much lower	35.8%	34.2%	35.0%	0.742	10
Fulfilment of physical activity (PA) guidelines, self-report				0.372
Aerobic type activity*	22.6%	23.2%	22.9%		3
Muscular exercise†	15.5%	25.6%	20.6%		3
Both aerobic and muscular	9.5%	9.8%	9.7%		3
Physically inactive (not meeting either guideline)	52.4%	41.5%	46.9%		3
Fulfilment of PA guidelines, accelerometer
Aerobic type activity*	29.4%	26.7%	28.6%	0.702	10
Other accelerometer measurements
Mean daily sitting time during week days, accelerometer	8 hour 42 min	8 hour 54 min	8 hour 48 min	0.311	10
Proportion of mean daily recording time (minimum 10 hours/day)
Sedentary behaviour (lying/sitting)	61.7%	62.4%	62%	0.591	10
Standing	16.2%	16.2%	16.2%	0.981	10
Light intensity physical activity (METs,‡1.5–2.9)	12.9%	12.6%	12.7%	0.431	10
Moderate intensity physical activity (METs, 3.0–5.9)	8.5%	8.1%	8.3%	0.341	10
Vigorous intensity physical activity (METs, ≥6.0)	0.7%	0.7%	0.7%	0.403	10

Statistical methods: 1indenpendent samples t-test, 2χ2 test, 3Mann-Whitney U test.

*Adults should be active several days (≥3 times) a week and accumulate 150 min of moderate or 75 min of vigorous-intensity physical activity (or their combination) of bouts ≥10 min.

†Muscle strengthening activity for large muscle groups twice a week (≥20 min/session) is recommended.

‡METs, that is, metabolic equivalents; 1 MET equals oxygen consumption of 3.5 mL/min/kg.

Descriptive results of the outcome measures at baseline are presented in table 3. There were no statistically significant differences between the study groups in any of the outcome measures.

Table 3

Baseline characteristics of musculoskeletal pain and local strain, physical fitness, fear avoidance beliefs, work ability and quality of life of the study participants

Characteristics	Study groups
	Exercise (n=87)	Control (n=83)	All (n=170)
Intensity of pain during the past month	Mean (SD)	Mean (SD)	Mean (SD)	p Value
Visual Analogue Scale (0–100 mm), neck pain	52.9 (24.4)	51.4 (26.5)	52.2 (25.4)	0.701
Visual Analogue Scale (0–100 mm), low back pain	40.2 (24.1)	39.0 (23.6)	39.6 (23.8)	0.751
Proportion with	%	%	%
pain intensity at least 40 mm for both neck and back	43.7	43.4	43.5	0.972
pain frequency of daily or almost daily pain in neck	59.8	61.4	60.6	0.832
pain frequency of daily or almost daily pain in back	37.9	36.1	37.1	0.812
radiating pain from neck to upper limb	40.2	37.3	38.8	0.702
radiating pain from back to knee level	14.9	22.9	18.8	0.192
activity limitations due to neck pain	14.9	7.2	11.2	0.112
activity limitations due to back pain	9.2	9.6	9.4	0.922
Local musculoskeletal strain after work days during past month (rating 0–6)	Mean (SD)	Mean(SD)	Mean (SD)
Neck	4.2 (1.3)	4.0 (1.5)	4.1 (1.4)	0.221
Shoulder	4.2 (1.3)	4.1 (1.4)	4.2 (1.4)	0.641
Upper back	3.2 (1.6)	3.1 (1.7)	3.2 (1.7)	0.511
Lower back	3.3 (1.7)	3.2 (1.6)	3.2 (1.6)	0.681
Hip	1.4 (1.5)	1.4 (1.4)	1.4 (1.5)	0.741
Knee	0.7 (1.1)	1.1 (1.4)	0.9 (1.3)	0.101
Physical fitness (W=women, M=men)  Static balance (0‒60 s) W(0)*  M(1)*	54.9 (12.8) 51.7(17.9)	56.3 (9.9) 51.0 (16.8)	55.5 (11.5) 51.3 (17.19)	0.571 0.981
	%	%	%
Neck-shoulder mobility W(0)*  (% with severe limitation) M(1)*	40.0 56.3	37.3 56.3	38.7 56.3	0.752
	Mean (SD)	Mean (SD)	Mean (SD)
Trunk side-bending flexibility (cm)  W(2)*  M(2)*	18.3 (13.6)	19.0 (3.5)	18.7 (3.5)	0.251
	18.2 (4.7)	18.6 (4.4)	18.4 (4.5)	0.791
Modified push-ups (repetitions)  W(5)*  M(1)*	6.9 (4.0)	6.2 (3.5)	6.6 (3.8)	0.241
	9.6 (3.0)	10.4 (4.6)	10.0 (3.9)	0.181
Static wall squat (0–90 s)  W(0)*  M(1)*	80 (49)	92 (50)	86 (46)	0.171
	83 (50)	87 (53)	85 (51)	0.761
6 min walk test (distance walked, m)  W(3)*  M(1)*	635 (60)	631 (62)	633 (61)	0.551
	641 (97)	655 (67)	648 (82)	0.391
Fear avoidance beliefs, physical activity (sum score 0‒30)	8.7 (5.4)	7.7 (4.3)	8.2 (4.9)	0.211
Work Ability Index, Short Form (sum score 3–27)	18.6 (1.5)	18.8 (1.0)	18.7 (1.3)	0.301
Health-related quality of life, RAND-36
Bodily pain (0–100)	56.6 (17.6)	60.2 (15.)	58.3 (16.8)	0.171
Energy/Vitality (0–100)	61.3 (18.2)	57.4 (18.6)	59.4 (18.5)	0.171
General health perceptions (0–100)	66.5 (18.0)	66.5 (17.9)	66.5 (17.9)	1.001
Role functioning, physical (0–100)	63.2 (38.3)	71.1 (33.9)	67.1 (36.3)	0.161
Emotional well-being (0–100)	74.3 (14.1)	73.2 (15.3)	73.8 (14.7)	0.601
Role functioning, emotional (0–100)	80.1 (31.9)	77.5 (32.6)	78.8 (32.2)	0.611
Social functioning (0–100)	79.7 (19.7)	81.3 (20.4)	80.5 (20.0)	0.611
Physical functioning (0–100)	85.9 (14.8)	89.3 (9.8)	87.6 (12.7)	0.071

*The number of missing cases in each of the fitness tests is presented in parenthesis; there were no missing cases for questionnaire data.

Statistical method: 1indenpendent samples t-test,2χ2 test.

At least moderate-intensity (‘clinically meaningful’) pain (≥40 mm) on the VAS score for both neck pain and low back was detected in 44% of the participants. The mean intensity and frequency of pain were higher for the neck than the low back, as was having radiating pain to the arm compared with the leg. Perceived local musculoskeletal strain after workdays was also higher in the neck and shoulders than in the back.

Severe limitations in sagittal level mobility of the neck and shoulder were reported by 56% of the men and by 39% of the women. Fear avoidance beliefs related to physical activity were low (mean 8.2/0‒30), indicating that fear of pain was an unlikely reason for possible lack of physical activity. The Work Ability Index was at a fairly good level (mean 18.7/3‒27). Reduced quality of life31 was detected for subscales of ‘Pain’ and ‘Energy’ (<60/0‒100), and ‘Physical health’ and physical ‘Role functioning’ (<70/0‒100).

Compliance with neuromuscular exercise and adverse effects

The exercise compliance was high: 67% (n=58) of the participants completed all 20 exercise sessions, 25% (n=22) exercised 15–19 times, 6% (n=5) 8–11 times and 2% (n=2) did not show up at all. No adverse effects of training were reported during the study by either the instructors or participants. Findings on pain and musculoskeletal strain in different anatomic sites at the 3-month follow-up confirmed the latter findings.

Effectiveness of the standardised Fustra20Neck&Back programme

The results are presented as the mean difference with 95% CI in figures 2–4. The decrease in pain intensity (p=0.001, figure 2A) and frequency (p=0.024, figure 2C), and strain (p=0.002, figure 2E) in the neck and shoulders, in the exercise group was significantly greater compared with the control group, with the decrease in intensity of neck pain bigger than the minimal important change (≥15 mm of the VAS score),27 with a mean reduction of 30 mm at 3 months and 23 mm at 12 months (figure 2A). Effect size (Cohen's d) of VAS score in the neck was 0.453 and 0.364 in the back. The proportion with daily/almost daily neck pain in the exercise group was reduced 45% from baseline to 3 months and 33% from baseline to 12 months (figure 2C). The reduction of perceived work-induced local strain in the neck and shoulder (figure 2E) was 28% at 3 months and 32% at 12 months. No between-group differences were detected in the intensity (figure 2B) and frequency of LBP (figure 2D) or local strain in the upper and lower back (figure 2F).

Figure 2

Changes in intensity and frequency of pain and work-induced local musculoskeletal strain between baseline, 3-month and 12-month follow-up. (A) Intensity of neck pain and (B) intensity of low back pain; lower number indicates positive outcome and ≥15mm change indicates minimal important change. (C) Frequency of neck pain and (D) frequency of low back pain; proportion with daily or almost daily pain, lower number indicates positive outcome. (E) Local strain in neck and shoulders and (F) local strain in upper and lower back; Numeric Rating Scale (0–6), sum score of two locations (0–12), smaller number indicates positive outcome.

The exercise group compared with control had significantly greater improvements in neck-shoulder (p=0.014, figure 3A) and trunk side-bending flexibility (p<0.001, figure 3B). The results of the other fitness tests (figure 3) of modified push-ups (figure 3C), static wall squat (figure 3D), 6 min walk test (figure 3E) and static balance (figure 3F) were not significantly different between groups. The modified push-ups, wall squat and 6 min walk test all had significant positive time effects (p<0.001).

Figure 3

Changes in physical fitness between baseline, 3-month and 12-month follow-up: (A) Mobility limitations in neck-shoulder area; % with severe limitations, lower number indicates positive change. (B) Flexibility in trunk side-bending; average of right and left side (cm), higher number indicates positive change. (C) Upper-body strength and trunk stability; number of modified push-ups in 40 s, higher number indicates positive change. (D) Lower extremity endurance; endurance time in static squat position, higher number indicates positive change. (E) Cardiorespiratory fitness measured with 6 min walk test; distance walked, higher number indicates positive change. (F) Static balance in one-leg stand; time managed to stand still, higher number indicates positive change.

The changes in health-related quality of life are presented for six of the eight subscales (figure 4), excluding ‘Social functioning’ and emotional ‘Role limitations’, which both had high mean baseline values (table 1) and seemed to be not highly relevant as outcomes for an exercise intervention. Statistically significant differences in favour of the exercise group were detected in the RAND-36 subscales of ‘Pain’ (p=0.003, figure 4A) and ‘Physical functioning’ (p=0.022, figure 4B). A positive time effect was demonstrated for ‘Role limitations’ due to physical health (p<0.001, figure 4D), ‘General health’ (p=0.001, figure 4C) and ‘Energy’ (p=0.004, figure 4E).

Figure 4

Changes in quality of life between baseline, 3-month and 12-month follow-up: (A) pain, (B) physical functioning, (C) general health, (D) role limitations due to physical health, (E) energy and (F) emotional well-being; higher number indicates positive change.

Discussion

The findings of the present study indicate that the standardised Fustra20Neck&Back exercise programme is effective for reducing pain and work-induced local strain in the neck/shoulder area, but not in the lower back. In addition, exercise improved upper-body mobility and health-related quality of life in terms of perceived interference of pain and physical functioning. The positive effects seemed to be maintained during the 12-month follow-up.

Neck and LPB are the two major reasons for visiting primary healthcare providers, the proportion seeking help being much higher among those who report intense pain in both the neck and lower back compared with those with pain at either site.32 Neuromuscular exercise is the only mode of therapeutic exercise reported to be effective for relieving pain and disability of non-specific neck pain and LBP.14–16 The present study is the first to report results on the effectiveness of a standardised exercise programme for reducing neck and LBP within the private sport sector. This is of great importance for society because occupational and primary healthcare lack the resources required to provide large-scale exercise counselling or instructed exercise sessions.

The main reason that the Fustra20Neck&Back reduced pain and strain in the neck and shoulders but not in the low back may relate to the fact that the majority of the exercises targeted posture and movement control of the head, neck and shoulders (see online supplementary files 1 and 2), and there was a lack of functional exercises, such as the squat,33 that are aimed at improving control of the lumbar neutral zone. Different types of squat patterns are required for activities of daily living, such as sitting down and lifting, and most sporting activities.34 The Fustra20 Neck & Back programme also lacked exercises such as the side-bridge to challenge the musculus quadratus lumborum35 along with other key stabilising muscles of the trunk (external/internal oblique, lumbar multifidus, erector spinae, latissimus dorsi) without causing a notable increase in compressive forces acting on the lumbar spine.36 Four-point kneeling37 would be another safe and effective exercise that requires various trunk muscle activation patterns and challenges the ability to stabilise the pelvis.

The most unique feature of the present study is the high compliance with exercise: 80 of 87 participants completed at least 15 exercise sessions, but 5 of them were lost to follow-up at 12 months (n=75). An important factor for high compliance might be that the instructors acted as personal trainers. The physical and psychosocial environment of sports clubs may also differ positively from that of healthcare. Third, many of the over 800 volunteers interested in participating were familiar with the trademark of Fustra beforehand and expressed positive expectations. Finally, the study participants had free access to the training, for which the normal market price was around €70 per session at the time of the study.

Strengths of the study

To our knowledge, this is one of the first studies within private sport sector utilising a standardised registered exercise concept (Fustra) to prevent chronic pain and disability in office workers with neck pain and/or LBP. To become a qualified instructor, a special 2-week training course, including lectures on functional anatomy, exercise physiology, nutrition and practice to instruct three different exercise programmes (including Fustra20Neck&Back), is required. In the present study, all instructors were either physiotherapists or possessed a bachelor's degree in sports studies.

Limitations of the study

The major limitation of the study is that data on exercise compliance after the instructed 20 exercise sessions were not systematically collected during the second follow-up. All participants were provided with written home exercise instructions by their trainer, but systematic follow-up on compliance was not part of the standardised Fustra20Neck&Back exercise programme at that time. Recently, phone apps to facilitate continuing exercise at home were launched by Fustra, including a personal diary for follow-up. Regarding the present study, it is not known whether the reduction in pain and local musculoskeletal strain at 12 months was only due to the 3-month instructed exercise training or both the instructed training and continued self-training. A practical real-life limitation outside the study is the fairly high price of Fustra training, which certainly limits the ability of all people to participate.

Conclusions

The standardised Fustra20Neck&Back exercise programme was effective for reducing pain and local strain in the neck/shoulder area and improving upper-body mobility, but not for reducing pain and strain in the low back. Positive findings on neck pain, high compliance to exercise and lack of adverse effects support the use of the programme in sport/fitness clubs. These findings should encourage the Fustra founders to develop the contents as suggested. In general, sport and fitness clubs outside the medical domain may offer an important means to reduce chronic musculoskeletal problems in occupational populations.

Declarations

Ethics approval and consent to participate

The study was carried out conforming to the guidelines of good scientific practice and provisions of the Declaration of Helsinki. Approval of the study protocol was provided by the Ethical Committee of Pirkanmaa Hospital District (R14030). The clinical trial registration number is NCT02235207.

Accepted participants were invited to the study by personal email message by the study secretary of the UKK Institute. The detailed announcements of the study and approval papers to be signed were included as an attachment. Each participant personally gave the signed approval document to the Fustra fitness tester at the beginning of the baseline measurement of fitness, who then mailed the approval document along with pretesting health-screening and fitness test results to the UKK Institute.

Consent to publish

The person shown in online supplementary files 1 and 2 is Jarkko Kortelainen, who is the founder of the Fustra Neck & Back exercise programme. He provided all the material needed for files 1 and 2 to the first author, Jaana H Suni, and has accepted the contents of these additional files.