OBJECTIVE: To verify the methods used by the clinical trials that assessed the effect of tactile/kinesthetic stimulation on weight gain in preterm infants and highlight the similarities and differences among such studies.
SOURCES: This review collected studies from two databases, PEDro and PubMed, in July of 2014, in addition to bibliographies. Two researchers assessed the relevant titles independently, and then chose which studies to read in full and include in this review by consensus. Clinical trials that studied tactile stimulation or massage therapy whether or not associated with kinesthetic stimulation of preterm infants; that assessed weight gain after the intervention; that had a control group and were composed in English, Portuguese, or Spanish were included.
SUMMARY OF THE FINDINGS: A total of 520 titles were found and 108 were selected for manuscript reading. Repeated studies were excluded, resulting in 40 different studies. Of these, 31 met all the inclusion criteria. There were many differences in the application of tactile/kinesthetic stimulation techniques among studies, which hindered the accurate reproduction of the procedure. Also, many studies did not describe the adverse events that occurred during stimulation, the course of action taken when such events occurred, and their effect on the outcome.
CONCLUSIONS: These studies made a relevant contribution towards indicating tactile/kinesthetic stimulation as a promising tool. Nevertheless, there was no standard for application among them. Future studies should raise the level of methodological rigor and describe the adverse events. This may permit other researchers to be more aware of expected outcomes, and a standard technique could be established.
Preterm infants; Massage; Review; Weight gain; Tactile/kinesthetic stimulation
OBJETIVO: Verificar quais metodologias foram usadas por ensaios clínicos que avaliaram o efeito da estimulação tátil-cinestésica sobre o ganho de peso de neonatos prematuros e destacar as diferenças e semelhanças entre esses estudos.
FONTES DOS DADOS: Esta análise coletou estudos de duas bases de dados, Pedro e PubMed, em julho de 2014, além de bibliografias. Dois pesquisadores avaliaram os títulos relevantes independentemente e, então, escolheram consensualmente quais estudos seriam lidos completamente e incluídos nesta análise. Foram incluídos os ensaios clínicos que estudaram a estimulação tátil ou a massagem terapêutica associada ou não à estimulação cinestésica em neonatos prematuros e avaliaram o ganho de peso após a intervenção, tiveram um grupo de controle e foram escritos em inglês, português ou espanhol.
SÍNTESE DOS DADOS: Foram encontrados 520 títulos e foram selecionados 108 para leitura. Os estudos repetidos foram excluídos, o que resultou em 40. Desses, 31 atenderam a todos os critérios de inclusão. Há muitas diferenças na aplicação das técnicas de estimulação tátil-cinestésica entre os estudos, o que prejudica a reprodução precisa do procedimento. Além disso, muitos estudos não descreviam os eventos adversos ocorridos durante a estimulação, o procedimento feito quando esses eventos ocorriam e seu efeito sobre o resultado.
CONCLUSÕES: Esses estudos fizeram uma contribuição relevante ao incluir a estimulação tátil-cinestésica como uma ferramenta promissora. Contudo, não houve padrão de aplicação entre eles. Estudos futuros podem aumentar o nível do rigor metodológico e descrever os eventos adversos. Isso pode permitir que outros pesquisadores tenham mais ciência do que esperar e assim estabelecer uma técnica padrão.
Introduction
Preterm infants (PI) are exposed daily to many stressors in the neonatal intensive care unit (NICU) inherent to the critical care they need to survive. The manner and intensity of exposure vary according to the individual PI condition and response. It has already been shown that such exposure leads to structural and functional changes in specific areas of the brain, affecting its development,1language, and social-emotional and adaptive behavior.2
Tactile stimulation (TS) or massage therapy (MT), sometimes associated with kinesthetic stimulation (KS), is used in PI along with the standard clinical treatment. TS have been the object of clinical studies since the 1960s,3when it was proposed as a means of encouraging PI growth and development.3 , 4 , 5 , 6 , 7 , 8 , 9 and 10 Additionally, recent studies have shown that interventions such as tactile/kinesthetic stimulation (TKS) have the added benefit of reducing behavioral manifestations of stress.11
The objective of this systematic review was to verify which methodologies were used by clinical trials that study the effects of some types of TS/MT, whether or not associated with KS, on weight gain of PI. Clinical trials were selected that studied the effects on weight gain, as this is a determinant variable for discharge from the NICU. The differences and similarities between the methods used by the reviewed clinical trials were highlighted in an attempt to improve the methodological quality of future trials.
Methods
Two databases were searched for this systematic review: the Physiotherapy Evidence Database (PEDro)12 and the United States National Library of Medicine of the National Institutes of Health (PubMed).13 All studies listed on the date of search were accessed.
The PEDro database was searched by specifying the following fields in the advanced search option: therapy (stretching, mobilization, manipulation, massage); subdiscipline (pediatrics), and method (clinical trial).
PubMed was searched using six keyword combinations, as follows:
- Search 1: massage premature newborn
- Search 2: tactile kinesthetic stimulation
premature- Search 3: tactile stimulation premature
- Search 4: massage premature growth
- Search 5: kinesthetic stimulation premature growth
- Search 6: tactile kinesthetic stimulation premature growth
In addition to these searches, the references of the chosen articles were also checked, and another 12 relevant articles were selected for evaluation.
Inclusion criteria
Two independent researchers preselected the articles according to their titles. In case of doubt, the article was included in the selection process by consensus. The preselected titles were then stored in a file according to the database they were found, and their abstracts or texts were downloaded for assessment. Once downloaded, the articles were thoroughly read to select those that met the inclusion criteria detailed below.
The present review included all clinical trials that studied the provision of TS or MT, whether or not associated with KS, for PI in the NICU, assessed PI weight gain after the intervention, had a control group that did not receive any intervention in addition to the standard treatment provided by the NICU, and were composed in English, Portuguese, or Spanish.
Results
A total of 508 articles were found in the two abovementioned databases. Seventeen articles were fully read among the 206 articles found in the PEDro database, of which eight met the inclusion criteria. The first search on PubMed resulted in 126 titles, of which 30 were selected and 18 met the inclusion criteria. The second search on PubMed resulted in 16 titles, of which ten were selected and eight met the inclusion criteria. The third search on PubMed resulted in 86 titles, of which 14 were selected and ten met the inclusion criteria. The fourth search on PubMed resulted in 49 titles, of which 23 were selected and 16 met the inclusion criteria. The fifth search on PubMed resulted in 14 titles, of which nine were selected and six met the inclusion criteria. The sixth search on PubMed resulted in 11 titles, of which eight were selected and five met the inclusion criteria.
However, another 12 titles found in the references of the articles that met the inclusion criteria were analyzed, and of these, four were included, five were excluded, and three were not found. Table 1 shows the titles and where they were found.
In summary, 520 titles were found; the repeated studies were eliminated, resulting in 31 that met the inclusion criteria of the present review (Table 1).
TS/MT was done in many different ways,3 , 9 , 10 , 14 , 15 , 16 , 17 and 18 and the most of the studies did not provide a detailed description of how to proceed during the stimulation if adverse events occur, nor of the possible effects of these events on the outcomes.
Analysis of the techniques used by different studies showed that older studies, such as Solkoff et al.,6 Kramer et al.,7 and Solkoff & Matuszak8 did not specify which parts of the body were stimulated or how often. The pressure used during the intervention and its duration varied greatly between these studies.
White & Labarba3 were the first to combine TS and KS. In 1981, Rausch9 divided TKS into three phases of five minutes each and applied TKS only when the PI were awake, without changing their position in the incubator. Both Lee19 and Ferreira & Bergamasco20followed these procedures. Rausch9 suggested that new studies should provide the intervention for at least ten days, because weight gain increased after this period. Rausch's9 study was the first to show significantly faster weight gain in PI submitted to TKS and to describe the technique used in detail.
Scafidi et al. 21 standardized the three five-minute phases proposed by Rausch9 into prone TS + supine KS + prone TS. Fourteen of the 31 studies that met the inclusion criteria for the present review used the technique described by Field et al. 10 in 1986; 11 of the 14 were conducted by Field's team10 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 and 30 in the same institution and three were performed by other researchers, namely Lee,19Massaro et al.,31 and Ang et al. 32 The intervention was usually performed after the first feeding in the morning. In 1990, Field & Schanberg24 provided the intervention at the beginning of three consecutive hours, after the midday feeding.
Mathai et al. 14 introduced a new way of providing TKS, as follows: the intervention was done after the morning, midday, and evening feeding in the prone (TS) + supine (TS) + supine (KS) positions, which was repeated by Arora et al. 33 Like other studies, they also used some type of oil to reduce friction on the PI's skin.14 , 17 , 33 , 34 and 35 In some studies, only the mothers provided KTS.16 , 35 and 36
Ferber et al. 15 suggested that during the first ten seconds of TS, the caregiver should only rest his hand on the PI, avoiding movements.
Dieter et al. 27 was the first to provide TKS for only five days, showing that this was enough to increase the rate of weight gain significantly compared with the control group.
Diego et al. 28 demonstrated that moderate KTS pressure promoted better outcomes than the placebo group who received light KTS pressure. Also, in another time, trained a few therapists and suggested that the technique was effective, regardless of therapist.29
Massaro et al. 31 tested KTS and TS separately in different groups of infants and found that KTS appears to be better, but the difference was not significant.
Fucile & Gisel18 used the same trained researcher to provide the intervention and introduced oral stimulation (OS) in addition to KTS. They found that OS did not increase the rate of weight gain and attributed this result to the shorter period dedicated to each intervention, suggesting that the duration of the sensoriomotor input is critical for improving defined outcomes.
Ferreira & Bergamasco20 used gentle techniques with no rigid sequence, only when the PI was awake.
Moyer-Mileur et al. 37 used the Infant Massage USA protocol, but they modified for PI, eliminating massage of the abdomen.
Kumar et al. 34 demonstrated that PI who received oil massage soon after birth had less weight loss in the first week, probably due to undetectable water loss through the skin due to blockage of pores and sweat glands. Also, early oil application probably leads to better temperature regulation and less caloric expenditure due to cold stress.
Abdallah et al. 35 used TS without KS and did not find greater weight gain, but the pain scores on the Premature Infant Pain Profile were favored in the massaged infants, being lower after the intervention and at discharge, in addition to demonstrating better cognitive scores.
Discussion
Tactile stimulation has the advantages of being noninvasive, inexpensive, and safe, as was demonstrated by Livingston et al. 38 based on physiological stability and no change in agitation/pain scores of the infants receiving massage. The majority of the clinical trials studied herein (20 of the 31 studies)3 , 10 , 14 , 15 , 17 , 18 , 19 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 and 34 described a significantly benefit on weight gain in the PI group that received the TS/TKS. This information places TS as a promising adjunctive tool in addressing PI in the NICU. Some of the studies did not assess the data statistically; part of them justified this because of small sample size.6 , 7 and 8
Some correlations have been suggested to justify the faster weight gain of PI submitted to TKS, such as greater vagal stimulation and gastric activity,28 and 29 relationship with energy intake,3 , 10 , 15 , 17 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 and 39 sleep-wake behavior and behavioral scales,6 , 7 , 8 , 10 , 14 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 36 and 39 serum insulin and IGF-1 levels,30 and 37 and use of oil.33 , 40 and 41 The results found by Diego et al. 28 and Field et al. 42 on the effects of mild and moderate pressure showed that moderate pressure provided greater vagal stimulation. Diego et al. 29 also found greater gastric motility among the PI who were stimulated with moderate pressure and suggested that greater gastric activity may explain their faster weight gain. Field et al. 42 added that the group of PI stimulated with moderate pressure were more relaxed, characterized by their lower heart rates and by the assessment of their wake and sleep status, and behavior, as recommended by the Thomas Scale of 1975.21 They then suggested that the more relaxed state of the PI resulted in lower energy expenditure, which would then result in faster weight gain. This was confirmed by Lahat et al.,43 who used indirect calorimetry to show that a group of PI submitted to stimulation had lower energy expenditure.
Regarding energy intake, some studies have shown that stimulated infants have higher daily weight gain.10 , 17 , 22 , 23 , 25 , 26 , 27 , 28 , 31 , 32 and 39 Other studies recorded stooling frequency and found that it increased significantly, together with an increased formula intake on days 6-10.9 Rausch9 suggested that increased stooling was a consequence of higher formula intake. On the other hand, Scafidi et al. 23found that the frequency of stooling decreased, even when daily weight gain increased. White Labarba3 reported that the amount of formula consumed per feeding increased while the number of daily feedings decreased, which the authors attributed to the nursery routine: PI who did not consume the entire serving were fed more often. Other studies that reported faster weight gain did not find significant differences in energy intake.
Along with weight gain, other variables, some mentioned above, have been analyzed after application of TKS in premature. All of the following parameters were analyzed by clinical studies in PI who received TS/MT whether or not associated with KS during their NICU stay: weight gain;3 , 6 , 7 , 8 , 9 , 10 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 and 39 length of hospital stay;10 , 16 , 17 , 20 , 21 , 23 , 24 , 28 , 31 , 32 , 35 , 37 and 39 behavioral responses;6 , 7 , 8 , 10 , 14 , 19 , 20 , 21 , 22 , 23 , 25 , 26 , 36 and 39 sleep/wake stage;10 , 21 , 23 , 24 , 26 and 27 stress behavior;11 energy expenditure;43 body temperature;3 , 6 , 21 , 23 , 24 , 25 , 26 and 44 variations in stimulation pressure;42 use or non-use of oil;33 , 40 and 41 speed of brain maturation;38 vagal activity and gastric motility;28 and 29 serum insulin and growth factor I levels;30 and 37 late-onset sepsis;16 body fat deposition;37effect on the immune system;32 and bone formation.45 The studies had very similar objectives; that is, to identify the effects of TKS on these parameters and the possible causes of its benefits.
Some studies using only KS obtained results not only in greater weight gain but also in bone mineralization.46 , 47 and 48 As for TKS with or without KS for bone weight gain analyzed herein, they found that there was no ideal level of stimulation47 or optimal duration, frequency, and type of exercise for bone development.49 Further evaluation of this intervention (KS) was suggested to indicate for this purpose.50 A more recent study demonstrated a significant improvement in bone formation and decrease of bone resorption, using a more rigorous methodological design.48
A few studies have described the adverse situations that could occur during the procedure and the parameters that should encourage the therapist to interrupt the session.14 , 18 , 19 , 26 and 33 Certain signs during the application of the TKS, such as stress or uninterrupted crying for more than 60 seconds,26 defecation or urination,14 increased heart rate,19 and 27 or heart rate < 100 for 12 seconds and desaturation for more than 30 seconds,19 were some of the causes that led the therapists to interrupt the procedure or discontinue the study. Some therapists considered some signs in the 24 hours that preceded the intervention to suspend the procedure, such as fussing, vomiting, growing oxygen demand, frequent episodes of apnea, bradycardia, desaturation, or interventions conducted within the 30 minutes that preceded TKS, such as sight and hearing tests.18 Arora et al. 33 separated the adverse situations into temporary interruption and minor problems that neither affected feeding nor required any interruption in the trial.
Despite the information above, the majority of the studies did not mention adverse events and/or did not describe a course of action to deal with adverse events during the intervention. The studies that reported the occurrence of events that required the interruption of the procedure did not indicate how the procedure was resumed; for example, whether it was resumed from the start of the massage routine or whether it was continued from where it had stopped; also, they did not indicate whether the procedure should be resumed on the same day or on the next day, or whether these interruptions could affect weight gain. The clinical trials studied by this review made a relevant contribution to the scope of TS. Nevertheless, adding detailed data highlighted by this review, such as adverse events, would improve methodology and reliability for future studies.
Limitations
This systematic review was performed using two databases, in addition to checking the bibliographic articles of those that met the inclusion criteria; however, the possibility of not having included an article relevant to the topic that could have been found in other databases cannot be ruled out.
Conclusion
Assessment of the methodology of the studies reviewed herein showed that there is no standard for application of TS technique or recommended course of action if adverse events occur during the procedure. The effect of these adverse events that can occur during the TKS procedure may influence the results.
Generally, some kind of benefit associated with TKS, such as faster weight gain, shorter hospital stay, and better behavior, among others, was reported by all studies that used TS or TKS in PI. Nurseries have many stressors and TKS has been shown to be helpful in this context. Therefore, TKS should be considered as a possible therapy to be associated with the standard medical treatment. Even discrete gains in this population can result in long-term benefits. Future studies may raise the level of methodological rigor and describe the adverse events that can occur during the procedure. This may permit other researchers to be more aware of expect outcomes, and a standard TKS technique could be established.
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☆
Please cite this article as: Pepino VC, Mezzacappa MA. Application of tactile/kinesthetic stimulation in preterm infants: a systematic review. J Pediatr (Rio J). 2015;91:213-33.
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☆☆
Study conducted at Department of Pediatrics, Faculty of Medical Sciences, Universidade Estadual de Campinas (UNICAMP), São Paulo, SP, Brazil
Data citations
United States National Library of Medicine of the National Institutes of Health. [cited 17 Jul 2014]. Available from: www.ncbi.nlm.nih.gov/pubmed