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Rapid repetitive passive movement promotes knee proprioception in the elderly


Joint proprioception plays an important role in the generation of coordinated movements, maintenance of normal body posture, body conditioning, motor learning, and relearning. Previous studies have demonstrated that proprioceptive function of the elderly can be enhanced via specific exercises; however, not all of the elderly can actively and safely participate in physical activities. The purpose of this study was to evaluate the effects of rapid repetitive passive movement in an average velocity of 90°/s on knee proprioception in the elderly. A repeated-measure design was employed. Two age groups (12 young/12 elderly) were intervened with repetitive passive movements of 60 repetitions to the knee joint via two machines (isokinetic dynamometer/self-designed machine) in separate days. Changes in proprioception were evaluated via joint active repositioning and kinesthesia, both before and after the intervention. The results revealed that all subjects demonstrated good test–retest reliabilities on proprioceptive measurements. For the active repositioning and kinesthesia, significant statistical main effects were found for group and time, but not for machine. No statistical interactions were revealed. Despite of age-related proprioceptive declines, elderly subjects could benefit from rapid repetitive passive movements. This indicates that repetitive passive movement may be an alternative to physical activity for those who are home-bound, in a sedentary lifestyle, or with other health conditions that may limit their abilities to actively maintain or strengthen joint proprioception.


Proprioception is essential for people to accomplish daily tasks. It refers to the sense of knowing where one's body is in space and plays an important role in the generation of coordinated movements, maintenance of normal body posture, body conditioning, motor learning, and relearning [7]. Proprioception is primarily measured via joint position sense (static) and kinesthesia (motion) [9]. With the increase of age, knee proprioception is found to deteriorate [11, 32]. This deterioration can affect knee control and thus interfere with daily function such as balance [20, 21]. Therefore, proprioceptive training is needed in improving the quality of life in the elderly [10, 24, 37].

With global aging, issues of promoting health awareness and physical fitness of the elderly have become rather important. Although some exercises, such as tai-chi and wobble board exercise, were found to be beneficial to proprioceptive function among the elderly [3336], not all of the elderly can actively and safely participate in these physical activities. In real-life situations, a lot of the elderly are homebound, bed-ridden temporarily because of recent surgery, or with other health conditions that might limit their abilities to resume physical activities. Alternative exercises which can improve their proprioceptive function need to be developed.

Repetitive passive joint movement (RPM), if provided to the subject's knee joint in a relatively high speed (90°/s or 150°/s) for about 30–60 repetitions, was found to improve joint proprioception in healthy adults [13, 14]. This improvement was observed in active repositioning and kinesthetic evaluation of the test limb. According to literature, the effects of rapid RPM on proprioceptive improvement suggested a possible promising treatment for joint proprioception [8, 26, 28]. In addition, research revealed that proprioception is the main predictor of balance in the elderly population [2, 15, 22, 31]. Whether the rapid RPM would improve proprioception in the elderly is not investigated.

To date, studies of rapid RPM were limited to healthy young adults, and thus similar studies should be conducted in the senior population. Comparing to the healthy young subjects, proprioceptive acuity of the elderly was found to deteriorate in both static [1, 11, 16, 34] and motion senses [3, 32]. Because of the differences in proprioceptive sensitivity between the two age groups, it is unknown whether the elderly would demonstrate similar improvement as the healthy subjects did with rapid RPM intervention.

Therefore, the purpose of this study was to evaluate the effects of rapid RPM at a velocity of 90°/s on knee proprioception in the elderly. Based on previous literature, passive mode provided by an isokinetic dynamometer (manual speed switch, 0–300°/s; Cybex NORM Testing and Rehabilitation System, Computer Sports Medicine, Inc., Stoughton, MA, USA) was used to generate passive movement of the knee. However, the rather large and pricy isokinetic machine was not made for home use. A RPM machine which can move the knee joint in a peak angular velocity of 90°/s was then designed and manufactured for subjects to use at home or at a group home. Therefore, another purpose of this study was to evaluate whether the young and old would respond differently to the two RPM machines—a commercialized isokinetic dynamometer and a self-designed RPM machine.


Experimental approach to the problem

This experimental study was part of a study series examining the effects of rapid RPM on knee proprioception [13, 14]. The main focus was to find out the difference between the young and the elderly in response to the rapid RPM. In addition, effects caused by different rapid RPM devices were investigated. A repeated-measure design was thus employed. The independent variable was the age group (young/elderly), RPM machine (isokinetic dynamometer/self-designed RPM), and time (pre-test/post-test). The influences of rapid RPM were evaluated via the dependent variables, including knee repositioning error for joint position sense and threshold to the detection of passive movement (TTDPM) for kinesthesia, measured both before and after movement interventions.


Twelve healthy young volunteers and 12 healthy elderly participated in this study (Table 1). Subjects with a history that might interfere with the experiment, including (1) cognitive impairments with problem following commands, (2) knee injuries within the past 6 months, (3) severe osteoarthritis with marked swelling and range-of-motion limitation, (4) neuromuscular coordination impairments, (5) sensation deficits, and (6) currently taking pain killers or anesthetics, were excluded. All participants provided written informed consents. This study was approved by the Institutional Review Board of Chang Gung Memorial Hospital. All subjects were right leg dominant. The right leg was then designated as the testing leg.

Table 1 Subject demographics

All subjects demonstrated good test–retest reliabilities on proprioceptive measurements before movement intervention. For the young/elderly adults, same-day intraclass correlation coefficient (ICC) for active repositioning, TTDPM in flexion, and TTDPM in extension were 0.970/0.940, 0.834/0.933, and 0.799/0.828, respectively. The over-day ICCs for the three measurement variables were 0.944/0.951, 0.818/0.889, and 0.879/0.832, respectively.


The equipments utilized in this study included an isokinetic dynamometer (Cybex NORM Testing and Rehabilitation System, Computer Sports Medicine, Inc., Stoughton, MA, USA) and a self-designed RPM device to provide rapid RPM to the knee joint at a peak angular velocity of 90°/s, a high-speed camera (Basler A602f, Basler AG, Inc., Ahrensburg, Germany) along with an angle analysis software (MB-Ruler v.4.0, Markus Bader, Baden-Württemberg, Germany) to capture knee joint range-of-motion via the positions of the reflective markers with a measurement accuracy of 99.17 %, and a device for the measurement of knee joint proprioception by moving the extremity to the desired angle (see Ju et al. [13] for details). The self-designed RPM device consisted of a rotary bar driven by a motor (5IK90RGU-AF, Honto Denki Gear Motor CO., LTD.; output 90 W, range of speed setting 90–1,650 rounds per minute) with a speed-reducing gear (5GU50KB, Honto Denki Gear Motor CO., LTD., reduction ratio 50:1) mounted on a standing frame. One end of the rotary bar was attached to a rope, and the other end of it was attached to the leg plate mounted on a back-adjustable metal sitting frame. Pulleys were utilized to change the direction of pull via the rope. A control box was used to set the speed of the rotary bar at 30 rounds per minute. This whole rapid RPM unit moved the lower leg by pulling the leg plate with a peak angular deflection of 90°/s (Fig. 1). The kinematic performance curves of the leg plate are shown in Fig. 2.

Fig. 1
figure 1

Diagram of the self-designed RPM machine

Fig. 2
figure 2

Kinematic performance curves of the leg plate during intervention. The y-axis represents knee extension and flexion angles


The subjects were seated in a comfortable position, with their back fully supported by the backrest and legs hanging freely over the side of the metal frame. They were blindfolded and wore an earphone headset and an air splint on the lower leg to avoid feedbacks from sensory channels other than proprioception. Four reflective markers were attached to the greater trochanter, the iliotibial band level with the posterior crease of the knee when flexed to 80°, the head of the fibula, and the prominence of the lateral malleolus, respectively [30] (Fig. 3). High-speed camera was set at 1 m lateral to the side of the testing leg to capture the positions of the four markers in space for calculating angular changes of the knee. The frame rate of capture was set at 15 Hz. The subject was given a hand-held switch and was instructed to press it down when he perceived movement of the extremity being tested.

Fig. 3
figure 3

Testing position. Markers for camera capturing are shown in white dots

Knee proprioception was measured via active repositioning error scores and TTDPM. Active repositioning was evaluated via the subject's ability to reproduce specific knee angles at 30°, 50°, and 70° flexion by random order. To start with, the subject's leg hung freely on the edge of the metal frame. From the starting position, the subject's leg was moved to a specific angle for 5 s and then returned to the starting position. After 5 s, the subject was asked to reproduce that particular angle. The difference between the original starting angle and the reproduced angle was the error score. As for kinesthesia measurement, the starting angle of the knee was at 30°, 50°, and 70° flexion. The subject's leg was moved passively in an angular deflection of 0.5°/s to either flexion or extension. The subject was asked to press the on/off switch when he perceived the movement of the tested limb and to report the perceived movement direction. The difference between the angle while the subject pressed the switch and the starting angle was considered TTDPM. Two trials were conducted for each angle in both directions. A 20-s rest was provided between tests.

Following the measurement of proprioception, each subject received a RPM intervention of 60 repetitions. The subject's knee was set to move in the range of 10–110°. The peak velocity of the movement was 90°/s. The subjects received RPM intervention from two different machines—an isokinetic dynamometer and the self-designed RPM machine—in two successive days. The order of the machine intervention was counterbalanced. In a previous study, stretch reflex responses observed via the electromyography signals of the subject's knee musculature were used for verification [14]. The same procedure was done and monitored in the elderly for the current study. After the movement intervention, the subject underwent knee active repositioning and kinesthesia testing again for two trials, the same as the pre-test protocol.

Statistical analyses

The scores of the two proprioceptive testing trials were averaged for both joint repositioning error and TTDPM. The average scores both before and after movement intervention were calculated. All data were analyzed using SPSS version 17.0 (SPSS Inc., Chicago, IL, USA) statistical software. Independent t-tests were conducted to compare the demographic data of the two groups, namely, age, weight, height, and body mass index. A three-way ANOVA (group (2) × machine (2) × time (2)) with repeated measures on time was performed to compare the results among age groups and RPM machines along with their interactions. The level of significance was set at p < 0.05. If a repeated-measures ANOVA identified a significant difference among the means, multiple comparisons between pairs of means were used to determine where the differences existed with Bonferroni adjustments of alpha level.


Effects of rapid RPM on knee active repositioning

The absolute error scores for knee active repositioning before and after the intervention for two groups with two machines are shown in Fig. 4. Prior to the movement intervention, the repositioning errors for the young/elderly were 3.68° (SD = 1.27°)/5.21°(SD = 1.80°) with the isokinetic dynamometer and were 3.63° (SD = 0.95°)/5.15° (SD = 1.35°) with the self-designed machine. After the movement intervention, the repositioning errors for the young/the elderly were 2.81° (SD = 0.98°)/4.13° (SD = 0.99°) with the isokinetic dynamometer and were 3.06° (SD = 0.99°)/4.11° (SD = 0.85°) with the self-designed machine. Significant statistical main effects were found for group and time (p < 0.001), but not for machine. No significant interactions were revealed. In general, the elderly demonstrated more errors in joint repositioning and relatively higher variability than the young.

Fig. 4
figure 4

Absolute error scores for knee active repositioning before and after the intervention

Effects of rapid RPM on knee kinesthesia

The TTDPMs for knee kinesthesia in flexion and extension are shown in Fig. 5a, b. For measurements with knee flexion, prior to the rapid RPM intervention, the TTDPMs for the young and the elderly were 1.04° (SD = 0.47°)/1.89° (SD = 0.81°) with the isokinetic dynamometer and were 1.05° (SD = 0.45°)/1.73° (SD = 0.77°) with the self-designed machine. After the movement intervention, the TTDPMs for the young and the elderly were 0.59° (SD = 0.38°)/1.44° (SD = 0.76°) with the isokinetic dynamometer and were 0.52° (SD = 0.22°)/1.23° (SD = 0.42°) with the self-designed machine. Significant main effects were found for group and time (p < 0.001), but not for machine. No significant interactions were revealed.

Fig. 5
figure 5

TTDPMs for knee kinesthesia before and after the intervention a in flexion and b in extension

For measurements with knee extension, prior to the rapid RPM intervention, the TTDPMs for the young and the elderly were 1.12° (SD = 0.50°)/1.89° (SD = 0.55°) with the isokinetic dynamometer and were 1.00° (SD = 0.26°)/1.82° (SD = 0.65°) with the self-designed machine. After the movement intervention, the TTDPMs for the young and the elderly were 0.71° (SD = 0.30°)/1.44° (SD = 0.63°) with the isokinetic dynamometer and were 0.65° (SD = 0.25°)/1.34° (SD = 0.47°) with the self-designed machine. Significant main effects were found for group and time (p < 0.001), but not for machine. No significant interactions were revealed. For both flexion and extension, the elderly demonstrated higher thresholds to detect joint motion and more variability than the young.

The standard error of measurements (SEMs) for knee active repositioning, knee kinesthesia in flexion, and knee kinesthesia in extension were 0.155, 0.074, and 0.061, respectively. The 95 % confidence intervals of the reported SEMs for the three measurement variables were 3.659–4.284, 1.037–1.335, and 1.123–1.371, respectively. The values of SEMs revealed that the differences of our proprioceptive measurement were detectable.


Our results indicated that rapid RPM was able to improve a subject's proprioception based on the statistical significance revealed in time main effect. A large quantity of studies have disclosed the link between proprioception and balance [11, 21, 23, 25, 33] or proprioception and daily motor tasks such as stair ascending and descending [11]. The elderly demonstrated deficits in sensorimotor performance. Poor proprioception deteriorates their control of movement execution and physical activity participation. The improvement in proprioception should be beneficial to the elderly in performing daily tasks. In addition, no group × time interaction was found; therefore, young subjects did not improve more than the elderly and vice versa.

This proprioceptive improvement after receiving rapid RPM might be due to a couple of mechanisms. First, since the rapid RPM improved both active repositioning and kinesthesia, the sensibility of the mechanoreceptors might have been enhanced. During the rapid RPM, muscles surrounding the knee were stretched, and these stretches would stimulate muscle receptors. Similar to the young, stretch reflex responses of the elderly were clearly shown at the end range of knee flexion and extension. These reflexes might activate the Ia afferents within the muscle spindle and further modulate the rubrospinal and rubro-bulbospinal pathways, leading to increased fusimotor activities via gamma system recruitment [4, 6].

Second, cyclic passive movement was found to decrease muscle stiffness, especially with increased movement velocity [26, 28]. According to Loram et al. [19], proprioception of movement is mainly sensed by muscle spindles registering changes in fascicle length. Short-range muscle stiffness reduces the transmission of joint rotations to the extrafusal fibers, leading to a proprioceptive dead zone for small movements. Based on this rationale, the transmission of joint rotation information would be less interfered with decreased muscle stiffness, consequently avoiding the proprioceptive dead zone.

Even though proprioception in the elderly was found to improve after rapid RPM, the underlying mechanisms that led to such improvement were still unrevealed. According to the literature, the neurophysiological changes of age-related proprioception declines include but are not limited to decreased spindle diameter [17], fewer intrafusal fibers [18], and decreased mean density of cutaneous receptors per unit of skin [12]. Results from this study only demonstrated that with these age-related proprioceptive declines, elderly subjects could still benefit from rapid RPM. Neurophysiological monitoring of the proprioceptors during clinical experimental studies would provide a more detailed explanation to the underlying mechanism.

Furthermore, no machine main effect was found. This indicated that the self-designed device could provide desired the RPM to the extremity and produce similar effects. Since rapid RPM leads to instant proprioceptive improvement and a dynamometer is not a cost-effective machine to use in household, our machine has the potential to become a therapeutic device, given further clinical and research supports. The results hopefully can facilitate the commercial design of such equipment. Future optimization of suchlike device, such as increasing the robustness of the motor performance, noise reduction, and outlook enhancement, should be accomplished.

To date, most evidences revealed that physical activities and trainings could improve proprioceptive acuity, whereas only very few investigated on passive movements. For example, Tsang and Hui-Chan [33, 34] studied the effects of tai-chi, a traditional Chinese martial art, and found that tai-chi practitioners performed better in passive knee joint repositioning. Waddington and Adams [35] found that a 5-week wobble board training program was effective in improving ankle movement discrimination capability in 20 elderly subjects. Another study done by Westlake et al. [36] evaluated the effects of an 8-week balance exercise on ankle proprioception among the elderly and found that this exercise improved the subject's ability in velocity discrimination. Further studies on passive movement and its effect on proprioception in the elderly are needed.

With world aging and the increase in disability rate among aging population [27], finding alternatives for physical activities to promote healthy aging is of great importance. For elder adults with physical or cognitive conditions that might hinder their activity participation or jeopardize their safety during active participation, alternative exercises are needed in order to maintain their physical health. Based on the results of this study, rapid RPM could be a great alternative for these individuals. Daily use of rapid RPM at home, at the nursing home, or in the hospital might help in maintaining or improving proprioceptive functions in the elderly.

There are some limitations in this study. First, the post-test data of the current study were collected immediately following the intervention. No retention data were collected at this point. The long-term effects of RPM onto proprioception in the elderly need further investigation. Second, although the results of proprioceptive measurements were significant, the differences were small and it could be questioned if they had any functional relevance. Small-angle differences with statistical significance were also found in other studies. For example, Fischer-Rasmussen and Jensen [5] and Pap et al. [29] both investigated anterior cruciate ligament injured knee versus normal knee and found significant differences in joint angle of around ±1° between the injured and the normal knees. As for functional relevance, Tsang and Hui-Chan [33] detected a small difference of 1.9° in knee joint repositioning between their tai-chi practitioners (M = 69.4 years, SD = 5.5) and the control (M = 72.3 years, SD = 6.1). Correlated with the limit of stability performance, the tai-chi practitioners indeed demonstrated significantly better reaction time in initiating voluntary weight shifting than the control group, which indicated that such a small change could be functionally relevant. Nonetheless, further investigations are needed to discover whether proprioceptive enhancement after RPM intervention could lead to any difference in functional activities.

Practical applications

Rapid RPM as used in this study was an intervention that led to instant proprioceptive improvement in the elderly, regardless of their age-related proprioceptive declines. It would be an alternative for physical activity to the elderly who are in a sedentary lifestyle, and it has the potential to become a therapeutic and conditioning device with further clinical and research evidence. Results in this study have enhanced our knowledge on knee injury prevention, treatment, and rehabilitation in the elderly. More research is needed to support the presumed mechanisms which explain such proprioceptive improvement.


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Conflict of interest

Yan-Ying Ju, Jin-Kun Lin, Hsin-Yi Kathy Cheng, Chih-Hsiu Cheng and Alice May-Kuen Wong declare that they have no conflict of interest.

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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000 (5). Informed consent was obtained from all patients for being included in the study.

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Correspondence to Hsin-Yi Kathy Cheng.

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This research paper is based on actual and original work carried out by the authors.

Prof. Yan-Ying Ju contributed to the study design, literature search, data collection and analysis, data interpretation and writing. Mr. Jin-Kun Lin contributed to the literature search, data collection and analysis and figure preparation. Prof. Hsin-Yi Kathy Cheng contributed to the study design, literature search, data collection and analysis, data interpretation and writing. Prof. Chih-Hsiu Cheng contributed to the study design, data interpretation and writing. Dr. Alice May-Kuen Wong contributed to the study design, data collection and data interpretation.

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Ju, YY., Lin, JK., Cheng, HY.K. et al. Rapid repetitive passive movement promotes knee proprioception in the elderly. Eur Rev Aging Phys Act 10, 133–139 (2013).

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