Supportive Care in Cancer

, Volume 17, Issue 8, pp 1041–1048 | Cite as

The effect of exercise counselling with feedback from a pedometer on fatigue in adult survivors of childhood cancer: a pilot study

  • Ria Blaauwbroek
  • Martijn J. Bouma
  • Wemke Tuinier
  • Klaas H. Groenier
  • Matthieu H. G. de Greef
  • Betty Meyboom- de Jong
  • Willem A. Kamps
  • Aleida Postma
Open Access
Original Article

Abstract

Objective

The aim of this study was to evaluate the results of home-based exercise counselling with feedback from a pedometer on fatigue in adult survivors of childhood cancer.

Patients

Adult survivors of childhood cancer were recruited from the long-term follow-up clinic of the University Medical Centre Groningen, The Netherlands. A score of 70 mm on a visual analogue scale (scale, 0–100 mm) for fatigue was used as an inclusion criterion. Controls were recruited by the survivors among their healthy siblings or peers.

Methods

During 10 weeks, the counselor encouraged the survivors to change their lifestyle and enhance daily physical activity such as walking, cycling, housekeeping and gardening. As a feedback to their physical activity, the daily number of steps of each survivor was measured by a pedometer and registered using an online step diary at the start of the programme and after 4 and 10 weeks. Fatigue was the primary outcome measure, assessed with the Checklist Individual Strength (CIS) at start (T0), 10 weeks (T10) and 36 weeks (T36). Thirty-three healthy age-matched control persons were asked to complete the CIS.

Results

Out of 486 cancer survivors, 453 were interested and were asked to complete the VAS to measure fatigue; 67 out of 254 respondents met the inclusion criteria, 21 refused, 46 were enrolled and eight dropped out during the study. The mean scores on the CIS in the survivors at T0 was 81.42 (SD ± 20.14) and at T10 62.62 (SD ± 20.68), which was a significant improvement (p < 0.0005). At T36, the end of the study, the mean CIS score was 63.67 (SD ± 23.12); this was a significant improvement compared with the mean CIS at the start (p < 0.0005). There was no significant difference in the mean CIS scores of the controls during the follow-up period.

Conclusion

The stimulation of daily physical activity using exercise counselling and a pedometer over 10 weeks leads to a significant decrease in fatigue in adult survivors of childhood cancer, and this improvement lasts for at least 36 weeks.

Keywords

Fatigue Childhood cancer survivors Exercise counselling Pedometer 

Introduction

Fatigue can be defined as the perception of an unusual or debilitating sense of whole body tiredness, different from the usual sense of tiredness experienced by healthy individuals [14].

Fatigue is one of the late effects of (childhood) cancer that negatively affects quality of life (QoL). The prevalence is unclear, and the aetiology is not well understood but probably multifactorial. Whatever the causes of fatigue in childhood cancer survivors are, those who experience fatigue need help.

A number of studies show different outcomes for the prevalence of fatigue in this particular population, varying from 5–40% [20, 28, 46]. Other studies found no difference at all in fatigue between survivors and controls [19, 47]. Prevalence of fatigue in the general population ranges from 11% to 45% [6, 21]. The survivors in our study are young adults whose life goals include starting a family, a professional career, and the realisation of financial security. Fatigue is reflected in decreased QoL, especially when sufferers become too weary to fulfil the social roles that make life meaningful [20, 24].

Different types of interventions to decrease fatigue have been developed: exercise training, education, attention-restoring activities and psychosocial techniques. In a randomised study, cognitive behaviour therapy showed a significant reduction of fatigue in severely fatigued disease-free cancer patients [12]. There apparently is a relation between (lack of) exercise, QoL and fatigue [29]. In the general population, inactivity doubles the risk of fatigue [6]. Exercise programmes have shown positive results in the treatment of fatigue in cancer survivors [7, 5]. Dutch rehabilitation programmes for fatigued cancer survivors, such as ‘Recovery & Balance’, combine exercise with psychological support and have shown positive results [13]. However, there are barriers to participate in these structured exercise programs. Participants in these programs are mostly survivors of adult cancer with a mean age of around 50 years, and young adult survivors of childhood cancer seldom participate [13]. Structured exercise programmes are time-consuming and especially young people—who often have jobs and raise a family—are often unable or unwilling to spend a lot of time on these programmes. Intervention meant to reduce fatigue should therefore be tailored to the survivors’ needs, especially to the needs of young adult survivors of childhood cancer whose cancer treatment occurred far in the past. Studies of the exercise preferences of cancer survivors have shown that walking was their preferred daily physical activity, and they preferred exercise at home [16, 42, 18]. With this in mind, we designed an individualised exercise programme for enhancement of daily physical activity.

We hypothesised that severely fatigued childhood cancer survivors would be less likely to meet public health exercise guidelines (i.e. at least 150 min of moderate-to-vigorous exercise/week) and that enhanced daily activity could realise an improvement in fatigue. Therefore, the purpose of our study was to evaluate the effect of enhanced daily activity on fatigue in adult survivors of childhood cancer.

Study subjects

Adult survivors of childhood cancer were eligible when they are 18 years or older, 5 years or more post diagnosis, and participated in the long-term programme (LTFU) of the UMC Groningen, The Netherlands. They were sent information about the study by mail and invited to participate in this programme on fatigue. Exclusion criteria were as follows: using a wheelchair, contraindications for exercise or severe cognitive impairment. To exclude potential seasonal influence on outcome of the Checklist Individual Strength (CIS) and to compare the CIS results of the survivors to those of healthy persons, 33 healthy age-matched controls (sibs and/or friends) were approached by the survivors and, subsequently, the investigators to complete the CIS to measure fatigue at the same time as survivors.

The study was approved by the UMCG review board. Written informed consent was obtained from all survivors and controls.

All survivors who were interested in the study were invited to fill in a Visual Analogue Scale for chronic fatigue (VAS fatigue) and a Stage of Change (SOC) questionnaire. The VAS fatigue, which is a numerical measure ranging from 0 to 100 has been used to asses fatigue in cancer survivors. Survivors with a fatigue score of 70 or higher were classified as suffering from severe fatigue and showed a dramatic decrease in physical functioning [26, 27]. Therefore, we used a score of 70 mm or more on the VAS as an inclusion criterion. The SOC questionnaire was used to evaluate to what extend the survivors met public health exercise guidelines (i.e. at least 150 min of moderate-to-vigorous exercise/week). The SOC questionnaire is helpful for the counsellor to adjust his approach.

Measuring instruments

Visual analogue scale for fatigue

A Visual Analogue Scale for fatigue (VAS fatigue) is designed to measure the characteristic fatigue, which is believed to range across a continuum of values and cannot easily be measured directly. Operationally, the VAS is a horizontal line, 100 mm in length, anchored by word descriptors at each end. In our study, the descriptors ranged from ‘not tired at all’ to ‘completely exhausted’. The patients were requested to mark on the line the point that they felt best represented their perception of their current state. The VAS fatigue score was then determined by measuring the distance in millimetres from the left-hand end of the line to the mark.

The Stage of Change questionnaire

The SOC is based on the Stages of Change Model developed by Prochaska and DiClemente [32]. This model suggests that people adjust their behaviour in five stages. People in stages 1–3 are sedentary. Those in stages 2 and 3 are more likely to change their physical activity behaviour. People in stages 1 and 2 will benefit most from a daily activity stimulation programme [2]. Those in stages 4 and 5 do already meet public health physical activity guidelines and need different advice in how to enhance daily physical activity compared to those in stages 1, 2 and 3.

All survivors who were interested in taking part in the study were asked to complete the SOC questionnaire.

Checklist individual strength (CIS)

Fatigue was the primary outcome and it was measured with the CIS. The CIS is a validated 20-item questionnaire, that is designed to measure four aspects of fatigue that may have been experienced during the previous 2 weeks, i.e. severity of fatigue (8 items), concentration (5 items), motivation (4 items) and physical activity (3 items) [23]. Each item is scored on a 7-point Likert scale. The total score is the sum of the scores 1–7 on the 20 items (range 20–140). Norm scores are available for different patient groups and healthy people. Based on scores in healthy controls a score on the subscale ‘fatigue severity’ between 27 and 35 indicates an increased experience of fatigue. A score of 35 or higher indicates severe feelings of fatigue [44, 45].

Pedometer (Yamax digiwalker SW-200®)

As Tudor Locke et al. have shown that a pedometer is helpful to provide feedback to those who use it, that it helps them to extend their daily activities and to set specific goals [37, 39], we used a pedometer to measure the number of daily steps. The Yamax digiwalker SW-200®, has been shown to be one of the most reliable pedometers [34, 40]. The instrument is worn on the belt or waistband and responds to vertical accelerations of the hip during walking. The non-ambulatory daily physical activities like swimming, cycling, weight lifting and so on are converted based on the intensity of this physical activity calculated in Metabolic Equivalents in minutes (METS min). For example: one minute cycling, swimming is about 150 steps [1]. The number of steps was registered in a step diary, either online or by posting their diaries, at start, in week 4 and week 10 (Fig. 1).
Fig. 1

Study design. CIS Checklist Individual Strength

Method

The study design is summarised in Fig. 1

The counsellor (MB) encouraged participants to change their lifestyle and enhance daily physical activity such as walking, cycling, housekeeping and gardening. The pedometer was used as feedback instrument to give the survivors insight in their daily physical activity, to help them to extend their daily activities and to set new goals.

The counsellor was trained according to the COACH protocol (www.coachmethode.nl). This method is based on the Motivational Interviewing Technique created by Miller and Rollnick and the goal-setting theory developed by Locke and Lathem, both considered to be effective instruments for behavioural modification [22, 33].

At the start of the programme survivors were visited at home by the counsellor, who explained the use of the pedometer and the step diaries (Table 1). They were asked to complete the CIS questionnaire and to invite a sibling or peer of the same age as a control person for the CIS questionnaire. The controls completed the CIS on the same time as the survivors but did not use the pedometer. The survivors wore a pedometer during two weeks at start to assess steps at baseline and in week 4 and 10 during the study (Fig. 1). At the end of each day, participants had to record daily step counts and duration in minutes of other activities, in either an online step diary or a posted diary.
Table 1

Topics discussed by the counsellor at the start of the study

1

How the pedometer works

2

How to record the daily steps and other daily physical activity on the specially developed website or in the diary

3

An information leaflet on how to increase daily physical activity and develop a physically active lifestyle

4

Participants were asked to use a pedometer for 2 weeks maintaining their normal daily physical activities as usual, and record their steps in a diary on the website or by posted diaries. Baseline step monitoring was used to assess baseline daily physical activity

5

Participants were asked to complete a CIS questionnaire and to find a relative or friend who would also be willing to complete this questionnaire at three different moments during the study

6

Participants were shown how to keep in contact with the counsellor by e-mail or telephone

At three weeks, six weeks and nine weeks the counsellor phoned the survivors. The SOC results helped the counsellor to know in what stage the survivor is so his approach can be adjusted accordingly. Those in stages 2 and 3 are more likely to change their physical activity behaviour. Those in stages 4 and 5 do already meet public health physical activity guidelines and need different advice in how to enhance daily physical activity compared to those in stages 1, 2 and 3.

At three weeks the use of the pedometer and the diary were evaluated and the results of the baseline measurement was discussed. Survivors were asked by how many steps they thought they could improve. Together with the counsellor, a new goal was set for the next appointment. All participants received a written summary of the telephone conversation and were asked to wear the pedometer again in week 4, recording their steps in the diary. After six weeks the counsellor and the participant evaluated whether the goals set had been accomplished, and if not, the specific barriers were discussed. In some cases it was necessary to adjust the goal to a lower number of steps per day. Participants were asked to plan a ‘peak day’. This was to be a day when circumstances were favourable (e.g. nice weather, shopping with a friend, etc.). On the peak day the survivor was supposed to take as many steps as possible. All survivors received a written summary of the telephone conversation and were asked to wear the pedometer on a peak day in week seven, recording the number of steps taken on this day in the step diary. After nine weeks the counsellor evaluated the ‘peak day’ and discussed with the survivors whether they thought it possible to adjust their goals to a higher number of steps per day. All participants received a written summary of the telephone conservation, and were asked to wear the pedometer in week ten, recording their steps in the step diary. Survivors and controls were asked to complete a CIS questionnaire at the end of the programme in week 10 and again in week 36 to asses if the assumed effect on fatigue would hold after termination of the counselling.

Statistics

A power analysis was calculated, with an alpha of 0.05 and a power of 0.80. Assuming a correlation of 0.70 between successive measures and a standard deviation of 20 meant that if 50 survivors and controls participated, a decrease of nine points on the CIS (between baseline and end) could be detected in the participant group compared with controls. We assumed that the CIS outcomes of the control group would not change. A general linear model for repeated measures (GLM) was used to compare the CIS results of survivors and controls over time (baseline, 10 weeks and 36 weeks). A ‘repeated’ contrast was used to investigate the significance of each measurement compared to the subsequent measurement. A general linear model for repeated measures was also used to study the change in daily physical activity (baseline, 3 weeks and 10 weeks) for the survivors. A linear regression analysis was used to analyse the relationship between the change in CIS score and the change in daily physical activity. A p-value less than 0.05 was considered significant. SPSS 15 was used to perform the analyses.

Results

Four hundred and eighty six survivors were eligible and were sent a letter to inform them of the study; initially those who replied (453/486), were sent the VAS and the SOC questionnaire. The response rate was 56% (254/453). Sixty-seven survivors had a VAS score of ≥ 70 mm, of these 67 qualifying survivors 21 refused participation for several reasons. Finally, 46 were enrolled in the study, but eight dropped out during the study. Descriptive characteristics of the survivors who entered the study at start are shown in Table 2. No statistically significant differences in age, cancer diagnosis and treatment between participants and non-participants were found. The median age at the study was 29 (range 18–61). Leukaemia was the most common diagnosis (46.8%).
Table 2

Characteristics of the participants

 

Participants (n = 46)

Age (years)a

29.8 ± 8,6

Age at diagnosis (years)a

8.1 ± 6.7

Time since diagnosisa

21.8 ± 7.1

Male genderb

14 (30.4)

Diagnosisb

 

Leukemia

22 (46.8)

Malignant lymphoma

6 (12.8)

Bone tumour

4 (8.5)

Soft tissue sarcoma

3 (6.4)

Wilms’ tumour

1 (2.1)

Langerhans cell histiocytosis

2 (4.3)

CNS tumour

6 (12.8)

Other

3 (6.4)

Treatmentb

 

Chemotherapy only

22 (47.8)

Surgery only

2 (4.4)

Radiotherapy only

0 (0)

Chemo and radiotherapy

22 (47.8)

Cranial radiation

12 (26.1)

aMedian ± SD

bNumber (percentage)

The Stage of Change questionnaire

Out of 453 survivors who were interested in the study, 251 childhood cancer survivors returned the SOC, 140 (56%) survivors did not meet public health exercise guidelines (i.e. at least 150 min of moderate-to-vigorous exercise/week) [15]. Out of the 46 participants, 36 (78%) did not meet public health exercise guidelines. The 46 participants were more likely (78%) to be in one of the three lower scales of the SOC questionnaire than the total group of survivors who completed this questionnaire (56%).

Fatigue

GLM analysis showed a significant interaction between time and group (F = 7.5, df 2.58, p = 0.001). The mean scores on the CIS in the survivors were 81.42 ± 20.14 at T0 and 62.62 ± 20.86 at T10, which was a significant improvement (F = 19.7, df 1.59, p < 0.0005). At T36, the mean CIS score was 63.67 ± 23.12, which was a significant improvement compared to the mean CIS at the start (F = 17.8, df 1.59, p < 0.0005). Controls had a mean score of 47.39 ± 19.06 at T0, of 46.18 ± 17.70 at T10 and of 42.57 ± 17.40 at T36.

This was significantly different (F = 29.7, df 1.59, p < 0.0005) from the mean CIS scores at T0, T10 and T36 of the survivors. There was no statistically significant difference in the mean CIS scores of the controls during the study period (Fig. 2).
Fig. 2

Changes in CIS scores in survivors and controls during study period. CIS Checklist Individual Strength; lines connect mean CIS scores, vertical bars represent 95% CI. Mean CIS scores ± SD of participants (81.42 ± 20.14 at T1; 62.62 ± 20.86 at T10; 63.67 ± 23.12 at T 36) and controls (47.39 ± 19.06 at T1; 46.18 ± 17.70 at T10; 42.57 ± 17.40 at T36)

Daily physical activity (steps per day)

GLM analysis showed a significant increase in daily physical activity (steps per day) during the first 10 weeks (F = 16.7, df 2.30, p < 0.0005). At T0, the mean number of daily steps in the participant group was 7.653 ± 3.272. After the first telephone session (T3) with the exercise counselor, there was an increase in the number of steps per day to 10.168 ± 3.483, which is an increase of 33%. At T10, after the third telephone session, when participants were asked to adjust their goals, the number of daily steps increased to 11.803 ± 3.695. This increase is statistically significant compared to the number of steps at T0 (F = 32.0, df 1.31, p < 0.0005) and T3 (F = 10.4, df 1.31, p = 0.003). From the start until the end of the intervention (10 weeks), there was an increase in daily steps of 54% (Fig. 3). Although the number of daily steps increased during the study period, there was a low correlation of 0.12 between the increase in daily steps (T10 minus T0) and the decrease in fatigue (T10 minus T0).
Fig. 3

Increase in number of steps of survivors during study period (lines connect means, error bars represent 95% CI). Mean steps ± SD of survivors(7.653 ± 3.272 at T0; 10.168 ± 3.483 at T3; 11.803 ± 3.695 at T10)

Discussion

In this study the effect of a home-based daily physical activity counselling programme—with feedback from a pedometer—on fatigue in adult survivors of childhood cancer was evaluated. It was shown that such a programme was effective in decreasing fatigue in adult survivors of childhood cancer during at least a 36-week period. We found not only a statistically significant improvement in fatigue but also a statistically significant increase in daily physical activity, measured in steps per day by a pedometer. These results are in accordance with those of de Blok et al [4] who showed that the use of a pedometer in combination with exercise counselling is effective in increasing daily physical activity levels in COPD patients and of Tudor-Locke et al. [38] in patients with type 2 diabetes. Other studies conclude that a physical activity programme that adjusts lifestyle is as effective as a structured exercise programme in improving the daily physical activity of adults [10, 17]. However, most studies have been done in breast cancer survivors [7, 43, 31] and in patients who have received stem cell transplants [5, 9], whereas studies in childhood cancer survivors are limited [30]. We are not aware of other studies on the effectiveness of a physical activity counselling programme on fatigue in childhood cancer survivors.

Vallance et al. [41] reported that non-Hodgkin lymphoma survivors who met public health exercise guidelines had clinically and significantly higher QoL scores than survivors who did not meet these guidelines. In our study, 36 out of 46 participants (78%) did not meet public health exercise guidelines (i.e. at least 150 min of moderate physical activity per week).

Fatigued survivors represent a high-risk group, as they report more depression and poorer QoL than non-fatigued survivors and their peers [25]. The aetiology of fatigue in (childhood) cancer survivors is still largely unknown. There is a relationship between depressive symptoms and fatigue [11, 19, 25]. The relationship is complex, as fatigue may be the result of a depressed mood while, at the same time, a severely fatigued person may also become depressed. Servaes et al. [36] showed that in a group of severely fatigued cancer survivors, only 19% could be considered to be clinically depressed and 14% were clinically anxious. Regular exercise, even a moderate walking exercise programme, has been shown to decrease anxiety and depression levels [35]. Whether the cause of fatigue in cancer survivors is related to depression or due to lack of physical activity, cancer survivors might benefit from regular exercise. For many years, physicians have recommended to cancer patients that they should rest and avoid physical effort because exercise could generate symptoms such as fatigue [8]. However, physical inactivity induces further muscular wasting and loss of cardiorespiratory fitness. This could explain the persistence of fatigue in some patients even years after the end of treatment.

When designing exercise programmes, it is useful that the preferences of individual survivors be taken into account; these preferences might change according to which stage of life they find themselves [16, 42].

Our study has several limitations. The sample size was small, and the response rate of 56% was moderate. This may have led to a biased selection of participants. The value of a pedometer as an instrument to assess exercise might be questioned, as it is not sensitive to non-ambulatory physical activities such as cycling, swimming and fitness training (weight lifting). However, a pedometer is cheap and easy to use and therefore highly suitable for daily use. Because eight persons dropped out during the study, we did not include the 50 survivors as we intended at start, but because the improvement in CIS scores was higher than expected, the study had still enough power. The study was not randomised, and controls did not use the pedometer.

Conclusion

The stimulation of physical activity using exercise counselling with feedback from a pedometer over 10 weeks leads to a statistically significant improvement in fatigue in adult survivors of childhood cancer, and this improvement lasts for at least 36 weeks. A home-based daily physical activity programme, compared to the existing structured exercise programmes in rehabilitation centres, is cheap, less time-consuming and requires no special facilities. Therefore, this programme might be more suitable for young adults who are busy starting careers and planning to have a family. Randomised controlled studies with larger numbers of participants are needed to confirm our preliminary results. A longitudinal study is needed to examine long-term effects in terms of a decrease in fatigue.

Notes

Acknowledgements

The study was financially supported by the Innovation Fund of the University Medical Center Groningen. All authors declare that the answer to the questions on your competing interest form are all “No” and therefore they have nothing to declare.

Contributors

BMDJ, WAK, MHGDG and AP participated in the conception and design of the study and the critical revision of the report. MB, KHG and WT participated in the data collection, data analysis and drafting of the report. MB, WT, BMDJ, WAK, MHGDG, KHG and AP approved the final report.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2008

Authors and Affiliations

  • Ria Blaauwbroek
    • 1
    • 2
    • 3
    • 6
  • Martijn J. Bouma
    • 1
    • 2
    • 3
  • Wemke Tuinier
    • 1
    • 2
    • 3
  • Klaas H. Groenier
    • 4
  • Matthieu H. G. de Greef
    • 5
  • Betty Meyboom- de Jong
    • 4
  • Willem A. Kamps
    • 1
    • 2
    • 3
  • Aleida Postma
    • 1
    • 2
    • 3
  1. 1.University Medical Center Groningen, University of GroningenGroningenThe Netherlands
  2. 2.Department of PaediatricsUniversity Medical Center GroningenGroningenThe Netherlands
  3. 3.Division of Paediatric OncologyUniversity Medical Center GroningenGroningenThe Netherlands
  4. 4.Department of General PracticeUniversity Medical Center GroningenGroningenThe Netherlands
  5. 5.Institute of Human Movement SciencesUniversity of GroningenGroningenThe Netherlands
  6. 6.University Medical Center GroningenGroningenThe Netherlands

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