The effect of exercise and nutrition interventions on physical functioning in patients undergoing haematopoietic stem cell transplantation: a systematic review and meta-analysis.

Introduction

Haematopoietic stem cell transplantation (HSCT) is a potentially lifesaving treatment for many hematologic malignancies, such as multiple myeloma, lymphoma and leukaemia. Annually about 70,000 HSCT’s are performed worldwide [ 1 ]. The number of patients undergoing HSCT has rapidly increased over the past decades and has not shown any signs of plateauing so far [ 2 ]. Long-term survival rates have been rising, due to advancement in the management of complications [ 3 ]. However, despite saving many life years, this treatment often comes with complications, such as graft-versus-host disease (GvHD), infections and oral mucositis, that lead to life years lived with disabilities and transplant-related mortality [ 4 , 5 ].

Apart from these complications, many post-HSCT patients suffer from negative consequences of treatment such as impaired physical functioning, a decreased quality of life (QOL) and fatigue [ 6 – 9 ]. Adding exercise interventions to usual care might contribute to the improvement of physical functioning, fatigue and QOL in haematopoietic stem cell recipients [ 10 – 12 ]. A 2019 Cochrane review shows that there is moderate- to low-quality evidence that aerobic physical exercise positively influences physical functioning in adult patients with and without HSCT for haematological malignancies [ 13 ]. However, a 2018 meta-analysis by Liang et al. showed no statistically significant effects of exercise interventions on cardiorespiratory fitness and upper muscle strength in HSCT patients. It did show statistically significant positive effects on lower muscle strength, fatigue and QOL [ 14 ].

In addition, the effects of nutritional interventions for HSCT recipients are studied in two other reviews, showing inconclusive evidence [ 15 , 16 ]. In patients undergoing chemo- or radiotherapy, nutritional interventions seem to have a positive effect on preservation of nutritional status and QOL [ 17 , 18 ]. The merits of nutritional interventions for physical functioning were not clear [ 18 ].

Cancer rehabilitation is incrementally seen as an intricate part of a patient’s medical treatment [ 19 ]. Patients are motivated to improve their health through lifestyle changes after diagnoses of cancer to prepare for the intensive upcoming treatment, serving as an opportunity to increase physical functioning in HSCT recipients through exercise and nutrition interventions [ 20 ]. Since the publication of the Cochrane review, several new studies with exercise interventions have been published [ 13 ]. On top of that, recent systematic review on nutrition does not solely include randomised clinical trials, which limits our confidence in the estimation of true intervention effects [ 15 ]. Hence, the aim of this study is to determine the effect of exercise and nutrition intervention on physical functioning in patients receiving haematopoietic stem cell transplantation. Secondary outcome are QOL, fatigue, body fat, weight, length of stay (LOS), mortality and GvHD.

Materials and methods

The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) statement was followed [ 21 ]. A completed PRISMA checklist is provided in Supplementary Appendix A .

Eligibility criteria

This systematic review and meta-analysis includes randomised controlled trials (RTC’s) that were published between 1 January 2010 and 1 July 2020.

Studies that included adults (16 years and older) who are planned for or have received autologous or allogenic HSCT were included. Only studies in which at least 75% of patients undergo HSCT with at least ninety percent of patients suffering from a haematological malignancy were included. Studies that are not available in full text or English were excluded.

Studies with exercise and nutrition interventions before, during or after the transplant were included. Only exercise studies that involve aerobic, strength or whole body vibration training were included. Exercise interventions based on inspiratory muscle training, yoga, tai-chi and chi-gong were excluded. Studies that include vigorous exercise in the treatment plan of patients in the control group were excluded. Studies with nutrition interventions that aimed towards reaching a calorie and/or protein goal were included.

Information sources and search

Three electronic databases were searched by MP, in specific PubMed, Embase and the Cochrane Central Register of Controlled Trials (CENTRAL). A search strategy was designed with the help of an information specialist (OYC) and included thesaurus terms and free text terms on the population and the intervention. Search terms on the outcomes were not included to maximise the sensitivity of the search. For the detailed search strategy, see Supplementary Appendix B . A randomised-controlled trial filter designed by the Cochrane collaboration was added in PubMed and Embase [ 22 ]. In Embase, conference abstracts were excluded. References of all included trials and relevant reviews were checked by MP for further literature.

Study selection

Two independent researchers (MP and GH) performed the title abstract screening using Rayyan [ 23 ]. In accordance with the PRISMA statement, reasons for exclusion in the full-text screening were documented [ 21 ]. Disagreement between the reviewers was resolved by discussion and mutual agreement. Cohen’s κ was used to assess agreement between the reviewers.

Data collection process

One reviewer (MP) extracted all relevant data, which was checked by a second reviewer (GH). In accordance with the guidelines proposed by the Cochrane Handbook, an adapted Cochrane Data Collection Form was used to extract data [ 22 ]. Collected data included a summary of the following: (1) study design and general information, (2) participant data, (3) intervention details, (4) outcome measures and (5) results. If different studies reported outcomes of the same patient population, data were combined into one form. If studies did not provide sufficient data for meta-analysis, authors were contacted.

Outcomes

The primary outcome in this study is physical functioning. All outcomes for aerobic capacity (e.g. 6-min walking distance and peak oxygen consumption), strength (e.g. hand grip strength, lower- and upper muscle strength) and functional performance were considered. Secondary outcome measures were as follows: QOL, fatigue, body fat, weight, length of hospital stay (LOS), mortality and GvHD.

Risk of bias

Two independent reviewers (MP and GH) assessed the risk of bias using the Cochrane Risk of Bias tool 2.0 for the following five domains: (1) bias arising from the randomization process, (2) bias due to deviations from intended interventions, (3) bias due to missing outcome data, (4) bias in measurement of the outcome and (5) bias in selection of the reported result. The risk of bias domains was scored as ‘low risk,’ ‘high risk’ or ‘some concern.’ Discrepancies were discussed and resolved through mutual agreement. A third author (MB) was consulted if necessary.

Data synthesis and analysis

Meta-analyses were performed with Review Manager 5.4 [ 24 ]. The meta-analysis was performed if at least three studies had measured the same outcome. Data from the first time point post-intervention were selected. Nutrition and exercise studies were considered for meta-analysis separately, due to the heterogeneity of the interventions. When various studies used different scales for continuous outcomes, standardised mean differences (SMD) were calculated; otherwise, mean differences (MD) were calculated. Heterogeneity of the treatment effects between trials was assessed using the I 2 test, with I 2 = 50–90% indicating substantial heterogeneity and I 2 = 75–100% indicating considerable heterogeneity [ 25 ]. Because considerable heterogeneity was expected, a random effects model was used. Differences of 0.2, 0.5 and 0.8 standard deviations were considered as ‘small,’ ‘medium’ and ‘large’ effect sizes respectively [ 26 ].

Results

The process of study inclusion and the reasons for exclusion are presented in an adapted Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) flow diagram (Fig. 1 ). The searches acquired in total 2518 records. After duplicate removal, 1669 records underwent title abstract screening in Rayyan. Thirty records were screened for full text, of which fourteen were excluded. Twelve studies (sixteen publications) met the inclusion criteria and were forward and backward reference searched, which identified one additional study (two publications) and five other duplicate publications. In total, thirteen studies with 23 publications were included in this review [ 27 – 49 ]. Eleven studies (21 publications) were included in the meta-analysis. Agreement of study inclusion between the two reviewers was almost perfect (kappa = 0.90, 95% CI 0.76–1).

Study characteristics

The thirteen included studies comprised data of 954 patients (range 19–187 patients). An overview of the study populations is shown in Table 1 . Mean age ranged from 30 to 63. In all studies, over half of the population was male. HSCT type and diagnosis varied widely across studies, including multiple myeloma and numerous types of leukaemia and lymphoma. Eleven studies included an exercise intervention and two studies included nutrition interventions.

Table 2 shows the interventions. In eight studies, the frequency of exercise intervention ranged from two to four times a week [ 29 , 33 , 34 , 37 , 38 , 46 , 47 , 49 ] and two studies consisted of daily exercise intervention. [ 27 , 40 ]. Eleven studies included an exercise intervention and two studies included nutrition interventions. Two exercise intervention studies only included aerobic exercise [ 27 , 49 ], three only included strength training [ 33 – 35 , 40 ] and the remaining six studies combined both aerobic exercise and strength training [ 32 , 37 – 39 , 41 – 44 , 46 – 48 ]. Three out of the 11 exercise studies were entirely unsupervised [ 29 – 32 , 47 – 49 ]. The duration of the interventions varied widely from about 30 days to 6 months. They took place before ( n = 5)[ 29 – 32 , 45 – 49 ], during ( n = 9) [ 27 – 32 , 34 , 35 , 38 – 48 ] and after ( n = 8)[ 33 , 34 , 36 – 39 , 41 – 44 , 46 – 48 ] the hospitalisation period (Fig. 2 ). The adherence of patients in the intervention group ranged from 20 to 97%.

Risk of bias

An overview of the results of the bias assessment is shown in Fig. 3 . Randomization, concealment and the occurrence of baseline differences were adequately described and free of risk of bias in six studies [ 34 , 35 , 37 – 44 , 46 ]. Three studies were at high risk of bias due to deviations from the intervention [ 45 , 46 , 49 ]. Ren et al. [ 45 ] state their study is double blind, but no placebo protocol is mentioned. Two others were at high risk of bias because of troubles with adherence [ 46 , 49 ], one of which performed a per protocol analysis to assure a better estimate of the treatment effect [ 49 ]. Missing data led to a high risk of bias, except in two studies [ 33 , 41 – 44 ]. The studies all used validated outcome measurements, resulting in a low risk of bias in the domain of measurement of the outcome. In five studies, (some) outcome assessors were clearly blinded [ 37 – 39 , 41 – 45 , 49 ]. The selection of the reported results was often not described; only two studies published a protocol describing the analysis plan [ 38 , 39 , 41 – 44 ]. Two studies used multiple eligible analyses of the data that resulted in a high risk of bias [ 29 – 32 , 34 , 35 ]. Another risk of bias worth mentioning was a small sample size ( n = < 30) in three studies [ 33 , 45 , 49 ].

The effect of exercise interventions

Physical functioning

Cardiorespiratory fitness was measured in five studies with the Six-Minute Walk Test [ 29 – 32 , 37 , 46 – 49 ] and aerobic capacity in a submaximal ergometer cycle test in six studies [ 27 , 28 , 38 – 44 , 46 , 49 ]. The 6-min walking distance improved significantly (SMD 0.41, 95% CI 0.14 to 0.68, Suppl. Figure 4A ). Peak aerobic capacity did not show significant improvement in the meta-analysed studies (SMD 0.09, 95% CI − 0.30 to 0.48, Suppl. Figure 4B ).

Strength was assessed in multiple studies with hand grip strength ( n = 6) [ 33 – 35 , 37 – 39 , 41 – 44 , 46 ], and various methods of upper ( n = 3) [ 34 , 35 , 46 – 48 ] and lower ( n = 6) extremity strength [ 27 , 28 , 37 – 44 , 47 , 48 ]. Hand grip strength did not improve significantly (SMD 0.15, 95% CI − 0.18 to 0.48, Suppl. Figure 5A ). Overall, exercise interventions provided a small positive effect on lower extremity strength (SMD 0.35, 95% CI 0.13 to 0.56, Suppl. Figure 5B ). The positive effect on upper extremity strength was not significant (SMD 0.56, 95% CI − 0.04 to 1.16, Suppl. Figure 5C ).

Functional performance was measured with the 30 Second-Chair Stand test ( n = 4) [ 33 – 35 , 41 – 44 , 46 ]. The effect on functional performance was not significant (MD 1.89 repetitions/second, 95% CI − 0.30 to 4.09, Suppl. Figure 6 ). Several other methods were used to measure physical fitness, but they were only used by one or two studies and were therefore not considered in this review.

Quality of Life

Eight studies assessed QOL using (parts of) the European Organization for Research and Treatment for Cancer Quality of Life Questionnaire (EORTC QLQ-C30) [ 27 , 28 , 33 – 35 , 37 , 40 – 44 , 46 – 48 ]. The pooled result for seven trials ( n = 437) showed a small effect on global QOL when compared to usual care (SMD 0.27, 95% CI 0.09 to 0.45, Suppl. Figure 7A ). No significant effect was found for the subscale physical functioning (SMD 0.20, 95% CI − 0.10 to 0.50, Suppl. Figure 7B ). The scales of emotional functioning and cognitive functioning did show a small effect (Suppl. Figure 7D and 7E ). No effect was found for role functioning and social functioning (Suppl. Figure 7C and 7F ).

The pooled results for the symptom scales in five trials ( n = 247) showed a small effect for pain and diarrhoea (Supplementary Fig. 1B and 1G ). Other symptom scales, namely, nausea and vomiting, dyspnoea, insomnia, appetite loss, constipation and financial difficulties ( n = 4), did not show a significant effect (Supplementary Fig. 1A , 1C , 1D , 1E , 1F and 1H ).

Fatigue

The effect of exercise interventions on fatigue, measured with the EORTC QLQ-C30 fatigue subscale, showed a statistically significant decrease (SMD − 0.33, 95% CI − 0.55 to − 0.11, Suppl. Figure 8A ). Nine studies measured fatigue with another method than the EORTC QLQ-C30 fatigue subscale [ 29 – 35 , 37 – 44 , 46 – 48 ]. Commonly used methods were the Multidimensional Fatigue Inventory (MFI) ( n = 4) [ 40 – 44 , 46 – 48 ] and several versions of the Functional Assessment of Cancer Therapy (FACT) ( n = 4) [ 29 – 32 , 37 – 39 , 46 ]. Neither showed a significant effect on fatigue (Suppl. Figure 8B and 8C ).

Body fat and weight

Four studies reported a variety of outcome measurements accumulated by body composition measurement [ 37 – 40 , 46 ]. The effect on body fat was not significant (SMD 0.01, 95% CI − 0.30 to 0.31, Supplementary Fig. 2A ). Weight was assessed by three studies [ 34 , 35 , 37 – 39 ]. It decreased in the exercise group compared to the usual care group, but this effect was not significant (MD − 2.45 kg, 95% CI − 6.48 to1.59, Supplementary Fig. 3B ).

Clinical outcomes

Five studies reported LOS [ 27 , 28 , 34 , 35 , 40 , 46 – 48 ]. Two studies could not be meta-analysed due to insufficient data provision [ 40 , 47 , 48 ]. Meta-analysis (3 studies, n = 147) showed no significant difference between groups (SMD -0.17, 95% CI − 0.45 to 0.12, Suppl. Figure 9A ). Mortality was similar amongst groups (RR 0.97, 95% CI 0.62 to 1.53, Suppl. Figure 9B ) [ 27 , 28 , 33 , 37 – 44 , 46 – 49 ]. Three studies reported GvHD rates; rates did not significantly differ across groups (RR 1.10, 95% CI 0.78 to 1.53, Suppl. Figure 9C ) [ 27 , 28 , 46 – 48 ].

The effect of nutrition interventions

Because only two nutrition studies were included, meta-analysis was not performed. Both nutrition studies assessed hand grip strength. Ren et al. showed a significant improvement in hand grip strength ( p = < 0.05) [ 45 ], whereas Jabbour et al. found no between groups difference ( p = 0.96) [ 36 ]. Furthermore, Jabbour assessed Fat Mass Index through bioimpedance analysis and LOS; but found no significant between-group effects [ 36 ].

Discussion

This systematic review and meta-analysis includes data from thirteen studies implementing with exercise and nutrition intervention into the care of HSCT recipients aiming to improve their physical functioning. The exercise interventions were considered effective on 6-min walking distance, lower extremity strength and global QOL. No statistically significant effects were found for all other outcomes. To draw a conclusion based on the scarce results of the nutrition studies would be precarious. Overall, this meta-analysis shows that exercise interventions may be beneficial on physical functioning and QOL for HSCT patients.

These results are in line with an earlier review on the effect of exercise in HSCT recipients on physical functioning [ 50 ]. The small effect on QOL seen in our review is supported by two other meta-analyses about exercise interventions in HSCT recipients [ 14 , 50 ]. Medium positive effects of exercise on fatigue found by a 2013 meta-analysis on exercise interventions in HSCT recipients were not observed in our review [ 50 ]. Comparable studies for the nutritional studies are lacking; therefore, the effect of nutrition interventions remains unclear after our review. However, combined nutrition and exercise interventions have shown potential in studies with cancer patients previously [ 51 , 52 ].

Remarkably, the exercise interventions in this meta-analysis showed large heterogeneity in the method, intensity, timing and duration of the exercise. The usual care also differed. For example, Wiskemann et al. offered the control group physiotherapy [ 47 , 48 ].

A major strength of this study is that it includes a specific patient population. The study population is very homogeneous, with almost solely patients with a haematological malignancy that are treated with HSCT. In addition, this study is the first systematic review to combine both exercise and nutrition interventions in one review. Compared to two previous systematic reviews, it includes five new exercise studies that were not studied in a meta-analysis before [ 13 , 50 ]. During the process of writing this review, one newly published exercise intervention study was brought to the attention. The results of this RCT confirm the results of our review [ 53 ]. However, our review also has some limitations. Heterogeneity amongst the trials was present in the type of intervention and used outcome measurement methods. The latter was especially a concern in the measurement of lower and upper extremity strength. To determine the effect of a specific intervention, subgroup analysis would be necessary. The heterogeneity of interventions, methods, measurement and the small sample sizes resulted in a lack of power for subgroup analyses. Lacking information on adherence and poor adherence to the assigned intervention itself is another factor possibly clouding the results. Furthermore, the included studies were troubled with bias; most studies had a fairly large amount of missing data and drop outs. However, the majority of the patients dropped out because they had deceased, which unfortunately reflects clinical practice. Small sample sizes in the included studies might not be representative for the population. Lastly, only short-term effects were assessed.

This meta-analysis suggests that physical functioning can be improved using exercise interventions. An improved physical functioning has the potential to reduce fatigue and improve QOL [ 54 , 55 ]. Lower levels of fatigue and a better QOL will provide more opportunities to furthermore sustain, or even improve, physical function throughout intensive HSCT treatment. The potential merits of nutritional interventions on physical function, QOL, fatigue level and even clinical parameters are worth investing in. The most effective intervention for improving physical functioning in HSCT recipients could be uncovered by designing trials with different types of exercise interventions, frequency, intensity, timing and duration.

Furthermore, nutrition interventions should be studied as a separate entity, as results on the effect of nutrition are lacking in this specific patient population. High-quality, heterogeneous RCTs with bigger sample sizes and longer follow-up periods, using equal measurement instruments for all relevant outcomes, are needed.

This systematic review and meta-analysis shows that exercise interventions are promising to improve short-term physical functioning in HSCT recipients. To provide optimal supportive care and decrease negative consequences of life-saving treatment, further research into the optimal exercise interventions and the potential benefit of nutrition interventions is needed.

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (PDF 1318 KB)

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Acknowledgements

We would like to acknowledge O.Y. Chan (Information Specialist) for her assistance with the search strategy. We thank R.P. Akkermans (Statistician) for his advice on the meta-analysis.

Author contribution

MP, ALR, MvdB and GvH designed the structure of the review; MP and GvH performed the literature search and quality assessment; MP wrote the first draft of the manuscript and all authors edited and approved the final version.

Funding

Open Access funding enabled and organized by Projekt DEAL.

Data availability

Data is available.

Declarations

Ethics approval

Not applicable.

Consent to participate

Not applicable.

Consent for publication

Yes.

Competing interests

The authors declare no competing interests.

Footnotes

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Associated Data

Supplementary Materials

Supplementary file1 (PDF 1318 KB)

Supplementary file2 (PDF 391 KB)

Supplementary file3 (PDF 361 KB)

Supplementary file4 (PDF 403 KB)

Supplementary file5 (PDF 381 KB)

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Supplementary file14 (PDF 381 KB)

Supplementary file15 (PDF 336 KB)

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Supplementary file17 (PDF 338 KB)

Supplementary file18 (PDF 333 KB)

Supplementary file19 (PDF 292 KB)

Data Availability Statement

Data is available.