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Wpływ odruchowego pełzania w terapii Vojty na kontrolę lokomocji i postawy

Sun-Young Ha
1
,
Wojciech Kiebzak
2
,
Yun-Hee Sung
3

  1. The Basic Sciences Research Institute, Kyungnam University, Changwon, South Korea
  2. Faculty of Medicine and Health Sciences, Jan Kochanowski University, Kielce, Poland
  3. Department of Physical Therapy, College of Health Sciences, Kyungnam University, Changwon, South Korea
Medical Studies/Studia Medyczne 2023; 39 (2): 192–197
Data publikacji online: 2023/06/30
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Introduction

Vojta therapy was first used by the paediatric neurologist Vaclav Vojta in 1959 for children with motor alterations and for infants with a risk of cerebral palsy [1, 2]. Dr. Vojta described reflex creeping and rolling [3] and found functional changes through proper positioning and stimulation of appropriate trigger zones [4, 5]. Stimulation of trigger zones causes tonic muscle contraction patterns on both sides of the neck, trunk, and limbs to induce stereotypical motor responses, leading to improvement in postural control [6–8].
Reflex creeping in Vojta therapy stimulates proprioception the most [5, 9, 10], and proprioception is transmitted by 2 mechanisms (direct and indirect pathways). In the indirect pathway, stimulation of the Ia, Ib, and II fibers ascends to the cerebellum through activation of the spinocerebellar tract and travels from the cerebellum through the thalamus to the cortex. In the direct pathway, impulses from the periosteum, articular membrane, and joint pass through the dorsal fasciculus, medial lemniscus, and thalamus and then up to the cortex [4]. In addition, in the spinoreticular tract, Ia, Ib, and II fibers pass through the posterior horn of the spinal cord and the pontomedullary reticular formation (PMRF) to the thalamus [11] (Figure 1). It has been reported that the application of such peripheral afferent stimulation generates neuromodulatory activity in subcortical structures such as the cortex, brainstem, cerebellum, or reticular formation [6, 12]. Stimulation of these trigger zones eventually induces unconscious movements in the brain [13], making these stimulations important components for improving or recovering motor function [14–16].
Vojta therapy has been clinically applied in many countries for decades, and its effectiveness has been confirmed [14–20]. Recently, attempts have been made to elucidate the mechanism of Vojta therapy using magnetic resonance imaging (MRI), diffusion tensor imaging (DTI), and electromyography [7, 12, 15, 21, 22]. However, studies on this mechanism have not been systematically established, despite continuous research [13, 21]. Therefore, based on the latest research, we attempted to understand the neurological mechanism of reflex creeping and to prove its effectiveness. Finally, we suggest directions for future research on the neurological mechanisms of reflex creeping.

Description of Vojta therapy

Principle of Vojta therapy

Vojta therapy is also called “reflex locomotion” because it activates involuntary motor response patterns by inducing reflex motor patterns based on stimulation through peripheral pressure [23]. Vojta therapy stimulates the brain through proprioceptive stimulation applied to specific trigger zones in a specific posture, and a complete motor pattern appears as a result of the central nervous system response [14]. The 3 prin­- ciples applied in Vojta therapy are as follows: 1) automatic postural control, 2) upright posture against gravity, and 3) task-oriented movement of the limbs [1, 2, 24, 25]. Individuals require plans and programs (“innate patterns”) that combine task-related automatic adjustments of movement and posture to achieve postural control [1, 13]. In Vojta therapy, motor skills, such as sitting, crawling, and walking, are not trained. Innate movement patterns are activated without conscious intention [13]. Vojta therapy can be applied to a variety of conditions: cerebral palsy, central coordination disorder, peripheral paresis, spinal bifida, scoliosis, musculoskeletal disorders, etc. In addition, it has been proven effective regardless of age. However, patients with fever, children with epilepsy, and children who are extremely sensitive to tactile stimulation should be approached with caution [25].

Application of reflex creeping

Reflex creeping is initiated from the prone position, and the head is rotated 30° to one side so that the forehead touches the floor. For the arm on the facial side, the shoulder joint is at 125°–130° flexion and 30° abduction, and the elbow joint is flexed at 45° so that the medial epicondyle of the humerus touches the floor. For the occipital leg, the hip joint is at 30° flexion, external rotation, and the knee joint at 45° flexion. The arm on the occipital side is positioned freely along the trunk. The hand and finger joints are also freely positioned. The leg on the facial side is positioned straight from the ground [4, 5]. The trigger zones are the medial epicondyle of the humerus and the calcaneus tubercles. Other trigger zones may also be applied to induce a motor response. The trigger zones and directions of the reflex creeping are listed in Table 1. Thus, it is possible to elicit a better motor response through temporal and spatial summation.

Motor response of reflex creeping

The starting position is essential for eliciting a complete motor response [4, 9]. The global pattern of reflex creeping aims to assume an upright posture achieved through the sequential activation of muscles on both sides of the body. Corresponding points of the extremities (punctum fixation), the elbow of the facial side, and the heel of the occipital side become support points alternately [5].
When stimulated, the trunk is lifted off the floor with the support of the elbow and calcaneus, and the trunk moves forward in the direction of the supporting elbow. The wrist on the facial side is extended, and the fingers are slightly bent. The ankle on the occipital side is supported by maintaining a neutral position. The facial leg is flexed and raised to create a 3-point support, and extension of the spine appears (Figure 2) [4, 5, 26]. Achieving the proper curvature of the spine determines the upright posture of the body and, ultimately, alternating locomotion [2, 5].

Evidence that reflex creeping affects locomotion and postural control

Effects of reflex creeping on pontomedullary reticular formation

The motor response induced by stimulation of trigger zones is controlled by the midbrain or brainstem region [6, 9]. Vojta (1988) reported that the lowest coordination level of reflex creeping is in the dorsal longitudinal fasciculus located in the brainstem, and the highest coordination level is in the midbrain [4]. Among these, PMRF in the brainstem plays a key role in Vojta therapy [1, 6]. The PMRF receives both crossed and uncrossed inputs from the cortex [11, 27] and is involved in postural control and locomotion regulation [28, 29]. The PMRF is an important hub for sensorimotor integration, allowing the nervous system to properly combine voluntary movements with posture and locomotion [11]. It is also output to the reticulospinal tract and is involved in anticipatory and reactive postural adjustment and the control of muscle tone [11, 28, 30]. Using functional MRI, Hok et al. (2017) reported that the PMRF was activated when sequential finger opposition was performed after stimulation of the trigger zone (heel) [6]. Brainstem activation affects unconscious movements of reflex creeping [7]. Ha and Sung (2021) observed changes in the corticoreticular tract (CRT) in children with developmental delays before and after Vojta therapy using DTI [15]. They reported that the tract volume significantly improved, resulting in improved gait and motor function. The CRT terminates in the PMRF, providing volitional input to the PMRF. CRT is involved in generating gait command signals and promoting postural control through the descending reticulospinal tract [31, 32]. Therefore, reflex creeping can affect postural control and locomotion.

Effects of reflex creeping on the central pattern generator

The central pattern generator (CPG) is a neural network capable of independently generating organized patterns of rhythmic motor activity [33, 34]. The CPG plays a role in controlling the motor rhythm that governs human bipedal gait and right-left and flexion-extension patterns of muscle activity [11]. In other words, CPG ensures that the reflexes generated during the gait cycle occur at an appropriate time [35]. Recently, the concept of CPG in humans has been supported because it is known that the brainstem structure is related to human locomotion and postural control [23, 36–38]. Activation of PMRF through trigger zones affects the CPG by activating neuronal circuits in the spinal cord through reticulospinal neurons [11, 38–41]. The CPG induced by reflex creeping produces periodic rhythmic movement patterns [35, 42], which are associated with a stereotypic tonic response induced in response to Vojta therapy [5, 9]. Czajkowska et al. (2019) reported that the pressure increased when intraoral pressure during non-nutrition and nutrition was measured before and after Vojta therapy in premature newborns [43]. They reported improvements in sucking regularity and rhythm because Vojta therapy had a direct effect on the sucking CPG. Lim and Kim (2013) found that when reflex creeping was applied to children with cerebral palsy, the CPG was stimulated to activate alternating movements and affect gait function [35].
Activation of the CPG is influenced by propriospinal neurons (PSNs) in the spinal cord [44]. PSNs are a group of spinal intermediate neurons that connect multiple spinal cord segments and participate in complex or long motor reflexes and are known to play an important role in motor control and sensory processing [21, 45]. PSNs play an important role in the plastic organization of spinal circuits and are ideally positioned for motor recovery when supraspinal control is disturbed [21, 46]. PSNs contribute to motor CPG function, where inter-CPG communication or integration of external sensory signals produces rhythmic movements in the extremities [44, 47, 48]. In humans, PSNs participate in a variety of tasks, including the integration/modulation of descending supraspinal pathways (brain commands) and peripheral afferent (transmission of sensory input from receptors) inputs [45, 49]. Gajewska et al. (2018) found activation of the deltoid muscle through stimulation of the femoral epicondyle and activation of the rectus femoris through stimulation of the acromion when Vojta therapy was applied to healthy individuals [21]. They concluded that PSNs were activated. Dietz et al. (2001) reported that upper extremity muscle (biceps, triceps, deltoid) activity was observed when electrical pulses were applied to the tibial nerve during walking, indicating a nerve connection between the upper and lower extremity muscles [46]. Therefore, stimulation of trigger zones activates PMRF and influences the activation of CPG and PSNs.

Effects of reflex creeping on vestibular nuclei

The vestibular nuclei are interconnected to the supraspinal, brainstem, and spinal cord, which control posture and balance so that vestibulospinal influences are coordinated with the actions of other pathways [11]. The vestibular nuclei receive input from the premotor cortex, somatosensory cortex, cervical spinal cord, proprioceptive system (neck/limb), and visual system [11, 50]. The vestibular nuclei act as a hub for receiving information related to body position. In addition, it is projected onto the oculomotor and trunk muscles, as well as the upper and lower limbs, and plays a role in controlling posture and stabilizing gaze [51]. The vestibular nuclei affect postural control [52, 53] through the lateral/medial vestibular tract and reticulospinal tract [52–55]. The lateral vestibulospinal tract projects to all levels of the spinal cord and forms connections with motor neurons and interneurons [56–58], regulating the activity of  and  motor neurons in antigravity muscles through intraspinal circuits [11, 53]. Carratalá-Tejada et al. (2022) and Epple et al. (2020) reported improved postural control after applying Vojta therapy to multiple sclerosis and stroke patients, respectively [1, 14]. Ha and Sung (2021) also reported that postural control improved by tonic muscle contraction after Vojta therapy was applied to children with developmental delay and hypotonia [16]. The head is turned to one side to apply resistance in reflex creeping. As a result, information from the neck is input to the vestibular nuclei and PMRF to estimate self-motion and maintain posture and balance [11]. Information input to the vestibular nuclei through the head affects the antigravity movement of the trunk through the vestibular spinal tract, which is speculated to improve postural control.

Conclusions

Stimulation of the trigger zones of reflex creeping activates the brainstem with proprioceptive inputs to induce unconscious movement. We propose 4 potential areas in which Vojta therapy can influence locomotor and postural control (Figure 1). Future studies on the effects of reflex creeping in Vojta therapy on locomotion and postural control will be required.
1. Reflex creeping affects gait through the PMRF.
2. Reflex creeping affects postural control through the vestibular nuclei.
3. The activation of the PMRF and the vestibulospinal nuclei of the brainstem affects postural control and locomotion.
4. Brainstem activation affects CPG and propriospinal neurons to activate alternating movement.

Conflict of interest

The authors declare no conflict of interest.

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