Published: August 11th, 2023
Here, we present a set of massage manipulations in the rat model of cerebral palsy that can considerably improve the motor function of cerebral palsy rats.
Cerebral palsy (CP) is a disease with a high disability rate and morbidity. The clinical symptoms of cerebral palsy are motor dysfunction and abnormal posture development, often accompanied by cognitive impairment. Massage, a traditional Chinese Medicine therapy, can coordinate Zang and Fu, regulate Qi and blood, make the viscera work more smoothly, and calm Yin and Yang. Furthermore, it has been an effective method for CP in clinical. This paper summarizes a set of simple and standardized manipulations of massage for young rats with CP, which is easy to follow. The procedure follows: first, massage of four limb acupoints, including Quchi (LI11) and Zusanli (ST36); second, massage of the abdomen acupoints Zhongwan (RN12), Tianshu (ST25), Guanyuan (CV4), and Qihai (CV6); and finally, massage of the abdomen of the rats. This set of massage methods considerably improved the motor function of young rats with CP and is simple, standardized, and easy to follow. We adapted this set of manipulation methods in animal models to promote the internationalization and standardization of massage.
Cerebral palsy (CP) is a disease with a high disability rate and morbidity. Epidemiological investigation of cerebral palsy shows that 3-5 infants have cerebral palsy in every 1,000 infants1. The typical symptoms of cerebral palsy are persistent central motor and posture development disorder2, activity limitation with sensory3, perception, cognition4, communication5, behavioral disorder, epilepsy, and secondary musculoskeletal problem1. So far, there is no cure for this lifelong disabling disease. The current treatment methods include exercise therapy6, hydrotherapy7, functional electrical stimulation8, muscle exoskeleton9, umbilical cord blood cell therapy10, botulinum toxin injection, and surgery11. However, clinical rehabilitation takes a long time and consumes much energy, and rehabilitation requires active cooperation from patients, making it difficult to replicate in animal models. Surgery has limitations, indications, and irreversibility. Oral medication has poor efficacy in treating motor function in children with cerebral palsy12. Muscle exoskeleton therapy and umbilical cord blood therapy have high economic costs and are difficult to afford, making it critical to find suitable treatment strategies.
Massage is a non-invasive, side effect-free, highly accepted, cost-effective treatment method for children. It has been proven in both clinical13 and animal experiments14 to improve the dysfunction of CP. Traditional Chinese medicine believes massage can improve CP dysfunction by regulating the organs and unblocking meridians15. As an effective TCM treatment method, massage requires modern medical research methods to explain its mechanism of action to promote it to the world. However, there are objective research limitations and ethical limitations in the study of relevant mechanisms in children with CP. Therefore, studying the relevant massage mechanisms to improve CP in animals is more convenient. Although animals are different from children, investigating the effects of massage on animals requires adherence to TCM's fundamental theories. From the perspective of clinical and experimental zoology, we will replicate this technology from the human body to the animal body to study the effectiveness of massage, which will help promote the application of massage therapy.
First, traditional Chinese medicine believes that CP belongs to the symptoms of "five lateness" and "five softness"16. The causes of CP are congenital fetal dysfunction, liver and kidney deficiency, insufficient essence and qi, or acquired nutritional deficiency15. The kidney dominates the growth, development, or regeneration and repair of human organs and tissues, and these substances are crucial for the growth, development, tissue repair, and resurrection of the body. The Essential Qi of the kidney is the foundation of growth and development. Insufficient kidney essence can lead to bone marrow failure, disorders of qi and blood, and a lack of nutrition in the internal organs of the body, muscles, and bones. Children with CP are prone to delayed growth and development, decreased joint mobility of the limbs, and increased muscle tension. In addition, long-term illness can lead to excessive deficiency and blood stasis, causing meridian obstruction, leading to intellectual disability, slow response, motor disorders, language ambiguity, swallowing weakness, and symptoms of drooling, such as limb movement disorders.
The spleen governs the circulation and transformation, serving as the source of qi and blood biochemistry and the foundation of acquired ability. The human meridians connecting the viscera, arms, and legs are pathways that circulate qi and blood, communicate up and down, and regulate yin and yang. Massaging the Ren meridian can enhance kidney function and regulate qi and blood. The use of acupoints on the Spleen Meridian of the Foot Tai-Yin, Stomach Meridian of the Foot Yang-Ming, and Large Intestine Meridian of the Hand Yang-Ming in massage techniques improve spleen and stomach function, which helps to promote the circulation of Qi and blood. Massage utilizes meridians, specific parts, and acupoints to provide benign physical stimulation to the body of the child, causing reactive changes from the surface to the inside and from the outside to the inside, thereby improving local and overall blood circulation, restoring normal excitability and inhibition of the brain, and achieving corresponding balance in visceral and tissue blood function. According to this theory, we mainly use massage on acupoints such as the abdomen, Zhongwan (RN12), Tianshu (ST25), Guanyuan (CV4), and Qihai (CV6). Abdominal massage can improve the clinical symptoms of children with CP17,18,19, and it is highly likely to promote brain injury repair through the brain-gut pathway20. Because the spleen and stomach are the foundation of postnatal development, they can promote brain injury recovery by strengthening the spleen, benefiting the stomach, and replenishing qi and blood.
We replicated this technique on rats to simulate the intervention of TCM on CP as much as possible and found that abdominal massage can improve the dysfunction of CP rats. In summary, we present a set of methods for studying abdominal massage to investigate the relevant mechanisms of improving CP through abdominal massage. As the existence of many massage genres makes it very difficult to study massage mechanisms, it is necessary to standardize massage methods.
The Animal Ethics Committee of Jinshan Hospital, affiliated with Fudan University in Shanghai, approved this study. Young Sprague Dawley (SD) rats were raised in an SPF animal room with light from 08:00 to 20:00, darkness from 20:00 to 08:00, temperature controlled at 22 °C, and indoor relative humidity of 40%-50%. They had free access to food and water. All experimental operations on animals comply with the welfare ethics of experimental animals and animal experimental safety regulations.
1. Neonatal hypoxic-ischemic encephalopathy animal model 21
2. Massage technique parameters
NOTE: The core techniques of massage include pressing and rubbing as the primary intervention techniques. Before the experiment, the researchers drew on the operation of a technique tester who collected techniques from the Tianjin abdominal massage expert Wang Jingui.
3. Massage manipulation
NOTE: Ensure that the researcher's thumb pressure on the acupoints is stable and long-lasting.
4. Acupoint localization
NOTE: For rats born within 2 weeks, the weight and length of the rats are the same as those of the mice. Therefore, we used mouse massage methods in relevant literature to massage the rats during the 8-15 days of the rats24.
5. Weight and behavioral test
After the completion of ischemia and hypoxia modeling27,28,29,30 (the experiment was completed in the SPF animal room), the brains of young rats were taken after 48 h of survival to look for edema, liquefaction, and other phenomena, as shown in Figure 3. The weight changes of the young rats in the sham and massage groups were compared with those of the model group (Supplemental Table S1). The weight increase of the model group was slower than that of the massage group (Figure 4), which showed that massage improves the growth and development of young rats with CP. The balance beam test results showed that the model group took longer to cross the beam than the sham and massage groups (Figure 5A and Supplemental Table S2).
Moreover, the number of hind limb slips in the model group significantly increased compared with the sham group (Supplemental Table S3). In contrast, the number of hind limb slips significantly decreased in the massage group compared with the model group (Figure 5B and Supplemental Table S3). Massage intervention significantly improved CP rats' growth and motor function.
Figure 1: Animal modeling process and related behavioral testing. (A) Stripping of vagus nerve during modeling. (B) Massage 5-week-old rats. (C) Rats after ischemia completion. (D) Balance beam test. Please click here to view a larger version of this figure.
Figure 2: Display of some acupoints related to abdominal massage26. Please click here to view a larger version of this figure.
Figure 3: Edema on one side of the brain after 48 h post model establishment. Please click here to view a larger version of this figure.
Figure 4: Effects of massage therapy on weight. The average weights of the rat pups (n = 6) were measured from P7 to P40, and hypoxia-ischemia intervention was performed on P7. After HIE modeling, the growth rate of body weight in the model group decreased significantly, and massage therapy significantly improved it (p < 0.05). Data are presented as the mean ± SD; #p < 0.05 Massage group compared with the Model group. *p < 0.001 model group compared with the sham group. Please click here to view a larger version of this figure.
Figure 5: Effects of massage treatment on the motor dysfunction of cerebral palsy rats. (A) Time required for the rats to cross the beam (n = 6). (B) Number of slips of the hind limbs of the rats. Based on the results of Figure 4A,B, the motor performance of the massage group was significantly better than the model group (p < 0.05). Data are presented as the mean ± SD; *p < 0.001 Model group compared with the sham group. #p < 0.01 Massage group compared with the model group. **p < 0.0001 Model group compared with the sham group. ##p < 0.0001 Massage group compared with the model group. Please click here to view a larger version of this figure.
|The inner depression of the radial extensor carpi muscle and the
|outer depression of the elbow
at the radioulnar depression of the distal 5/6 point on the imaginary
|line connecting wrist and elbow, posterior to the extensor
digitorum communis tendon
|on the first dorsal interossei, medial to the middle of the second
metacarpal bone, in the forefoot
|at the depression inferior to the medial condyle of the tibia,
between tibia and gastrocnemius
|at the proximal one fifth point on the line from ST35 to the anterior
side of ankle crease
|at the proximal endpoint of the distal one fifth on the imaginary line
connecting SP9 and the medial malleolus of tibiofibular
|at the proximal end of the depression between the first and second
|at the point of 3/5 down the ventral midline connecting the
umbilicus to the pubic tubercle
|lateral to the umbilicus, at the midpoint from the umbilicus to the nipple line
at the point of 3/ 10 down the ventral midline connecting the
umbilicus to the pubic tubercle
Table 1: The anatomical positions of various acupoints26.
Supplemental Table S1: Raw data of weights of all three groups of rats. Please click here to download this File.
Supplemental Table S2: Raw data of time to cross the balance beam for all three groups of rats. Please click here to download this File.
Supplemental Table S3: Raw data of hind limb slips of all three groups of rats. Please click here to download this File.
The neonatal rat model of ischemia and hypoxia is the most classic model for studying cerebral palsy27,28,29,30. We intervened in rats from the 8th to the 40th day, which is approximately equivalent to interfering in humans from 3 months to 11.5 years old, the golden period for human growth and development31. The results indicate that massage is an effective method to ameliorate CP dysfunction. Previous animal experiments have shown that massage can reduce inflammation and improve motor and cognitive functions in young rats with CP14,32. Some clinical studies have shown that back and bladder meridian massage improves motor function in children with CP33. These results also show that massage can shorten the time for young rats with CP to pass over the balance beam and reduce the number of slips of their hind legs. Thus, it can be seen that abdominal massage can improve the motor function of young rats with CP.
Traditional Chinese medicine believes that CP belongs to the five delayed and five soft symptoms, with congenital kidney qi deficiency as the fundamental factor and acquired spleen and stomach weakness as the promoting factor. The kidney governs the bone and generates marrow, so that when the kidney is full of qi, the marrow becomes abundant, and intelligence remains normal. The spleen controls the muscles and limbs, so if the spleen is healthy, the muscles will be strong, and the joints will move freely. Therefore, it is necessary to replenish the spleen and strengthen the kidneys, improve gastrointestinal function, move limbs and joints, and improve function. First, TCM theory holds that the abdomen is the root of all diseases. Abdominal massage can clear up and down, separate yin and yang, remove the old and make new, enrich the five internal organs, drive out external evil, and eliminate internal diseases. Second, research showed that children with CP have lower body weight and are prone to malnutrition, including excessive or unbalanced intake, energy, or nutritional status34,35,36,37. Growth retardation and malnutrition are common in children with CP and are directly related to more severe motor dysfunction37. The risk of malnutrition is closely related to the prognosis of patients with CP34,38,39. Nowadays, the main research area of abdominal massage is to improve gastrointestinal symptoms such as functional dyspepsia, constipation, diarrhea, and infant anorexia33,40,41,42. Eventually, numerous studies show that stimulating Zhongwan, Tianshu, Guanyuan, and Qihai can treat gastrointestinal diseases, promote absorption, and improve nutritional status43,44,45. Abdominal points can treat gastrointestinal-related diseases, comb the central energizer's qi mechanism, replenish the primary qi's power, and promote the biochemistry of qi and blood. Therefore, we introduced abdominal massage into the experimental method to improve motor dysfunction in young rats with CP.
Abdominal massage is mainly combined with abdominal points, supplemented by limb points, such as Quchi and Zusanli. The external collaterals and joints of the four limb acupoints are connected to the internal organs, and abdominal massage is used to achieve the best therapeutic effect. On the one hand, experimental animal studies show that acupuncture Zusanli of newborn rats with hypoxic-ischemic CP could improve the function of young rats with CP46. On the other hand, clinical research shows that acupuncture at Hegu47and other acupoints can effectively enhance the development of CP. Quchi and Zusanli are the acupoints in the Yang-Ming large intestine of Hand meridian48 and Foot-Yang-Ming Meridian on somatostatin49, which are the most commonly used acupoints in the clinical treatment of stroke in China to improve limb paralysis50,51. In addition, Quchi and Zusanli are the confluence points of the large intestine and stomach meridians, respectively. From this point, the meridian qi reaches the viscera and is connected to the upper and lower parts and the meridians and collaterals. In addition, acupuncture and moxibustion plus massage showed a better effect on improving children with CP in clinical research results52. To summarize, TCM therapy can help improve the dysfunction of patients with CP.
Although there have been many studies on how massage can improve CP, the diversity of massage techniques has become an enormous challenge. There are many massage schools, and the differences in strength, direction, and other factors pose numerous challenges. We have learned a variety of massage methods and explored a set of simple and easy massage techniques. However, we cannot simulate a variety of massage techniques. Second, the time of massage is an important stage in the development of young rats. Its weight and the rapid growth of various body systems lead to the constant change of our finger strength for rats at different stages. Efforts must be continued to study the stability of massage.
The authors have no conflicts of interest to disclose.
|Animal anesthesia machine
|RWD OF SCIENCE
|Sri Trang Gloves (Thailand) Co.,Ltd
|RWD OF SCIENCE
|Shanghai Jihui Experimental Animal Breeding Co., Ltd.
|YF-3 manipulation tester
|Developed jointly by Shanghai Fudan University and Shanghai University of Traditional Chinese Medicine
|Patent number of the People's Republic of China (ZL200710187403.1)
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