The gait speed test is an easy assessment tool that widely used for the aging researches . Moreover, it can predict a future decrease in activities of daily living (ADL), and also elderly people’s motor functions including muscle strength, balance and flexibility are able to represent walking velocity . In addition, it was reported that elderly people’s functional capacity was predictable by their gait speed . Furthermore, the decrease in gait speed is a common process in aging and is often associated with several adverse health effects, such as weakness , falls , hospitalizations  and poor quality of life . Gait speed has been directly related to cognitive abilities of an individual   and it is considered an indicator of elderly who are at high risk for the cognitive decline  .
Based on these, it might be possible that gait speed can be a predictive factor of inclusive physical functions. In the present study, we examined relations between gait speed, motor ability and cognitive functions in rehabilitation users who need supports and in healthy elders to clarify the facts. Thus, the objective of present study is to clarify the relationship between gait speed and motor ability, Mini-Mental State Examination (MMSE) for 36 elderly persons who use day-service rehabilitation.
2. Subject and Methods
Thirty-six rehabilitation users (81.3 ± 5.7 years; 11 males and 26 females) and 22 healthy elders (79.1 ± 4.6 years; 7 males and 15 females) participated in this study. 59 subjects accepted the invitation of which 58 subjects could be included in the present study. The remaining 1 subjects were excluded owing to missing details about physical activity (n = 1).
The present investigation was approved by Kurume Rehabilitation Hospital Ethical Review Board for Medical Research Involving Human Subjects (ethical number: 21-001). Collected data included the socio-demographic characteristics (e.g., gender, age, educational background), anthropometric measurements (e.g., height, weight). Body mass index (BMI) was calculated by dividing the weight in kilogram by height in meter squared (Table 1).
We measured height and weight as the physique items and hand grip strength, gait speed test as motor ability items. We evaluated hand grip strength by a mechanical dynamometer with a dominant hand. We asked participants to walk on the straight walkway which consists of 11 m in length on the flat floor once at their preferred velocity. Gait speed was measured over a 5 m distance which was between 3 m to 8 m from the start line.
Cognitive function was assessed using a 30-question of MMSE; each correctly answered question was awarded one point, whereas incorrect or no answers were awarded zero points. The total score ranged from 0 to 30 points.
This work was supported by the Kabutoyama MS Limited company R, Japan (Kurume Rehabilitation Hospital, NO. 21-001).
Table 1. Demographic characteristics of participants.
IBM SPSS Statistics version 26.0 (SPSS Inc., Chicago, IL, USA) was used for statistical analysis. In this study, all continuous variables are presented as the mean ± standard deviation (SD) and categorical data are presented as numbers (percentages). Pair analyses were carried out using unpaired Student’s t-tests. Correlations were analyzed by Pearson’s correlation coefficient among continuous variables. After all, multiple regression analysis was performed for gait speed. The level of significance was set as P < 0.05*.
Table 1 provides an overview of the participants (rehabilitation users; 11 males and 25 females and healthy elders; 7 males and 15 females). The mean age of the sample was 81.3 years. Seventy-eight percentages of rehabilitation users (78%) were needed support 1 and forty-seven (47%) were with hypertension. Rehabilitation users had significantly higher systolic blood pressure (p < 0.05) and diastolic blood pressure (p < 0.05) than healthy elders. Healthy elders had significantly faster gait speed (p < 0.05) and better MMSE scores (p < 0.05) than rehabilitation users (Table 2). Gait speed of rehabilitation users showed significant correlation with MMSE scores (r = 0.50, p < 0.01) (Table 3). Table 4 shows the
Table 2. Comparison of variables between rehabilitation users and elder.
Notes: Values are means and SDs, BMI = body mass index; MMSE = mini-mental state examinations. *P < 0.05 by unpaired student’s t-tests.
Table 3. Correlation coefficient between gait speed and variables.
Notes: Values are means and SDs, BMI = body mass index; MMSE = mini-mental state examinations. *P < 0.05 by person’s correlation coefficient.
Table 4. Multiple regression analysis for gait speed.
Notes: MMSE = mini-mental state examinations. *P < 0.05 by multiple correlation coefficient. β: multiple correlation coefficient adjusted for the degrees of freedom. β = 0.50, P < 0.001, R = 0.97, R2 = 0.94 (gait speed of rehabilitation users). β = 0.08, P = 0.08, R = 0.39, R2 = 0.15 (gait speed of elders).
results of the multiple regression models. Gait speed of rehabilitation users was strongly related to MMSE scores, and the determinant of gait speed was MMSE scores.
In the present study, we examined motor ability and cognitive functions among rehabilitation users and healthy elders. The previous studies have shown that gait speed was taking part in 44% smaller in Rehabilitation users compared with elders , and the study which compared cognitive performance and gait speed of elders have shown that rehabilitation users with lower mean cognitive scores were also with lower gait speed    . Regarding gait speed, the Brazilian study which investigated pre-frailty and factors associated with this condition, identified significant relationship between slowness of gait and low cognitive functions in elders, and suggested that gait speed could be considered as one of the markers, which was able to be used to assess cognitive functions . Considering them, the importance of cares for elders regarding instructing of physical exercise to avoid progressive loss of muscle mass and to maintain proper gait sped were emphasized .
Younger individuals, walking is normally an automatic task, the, the cognitive and conscious component of gait control becomes progressively more important with ageing, possibly to compensate for sensory-motor deficits  . Paradoxically, however, decline in the both cognitive and physical function is common in elderly persons. The interrelated decline of cognition and mobility is postulated to be due to underlying shared neural substrates   . For example, neuroimaging studies have shown that gait and mobility deficits are frequently encountered in elderly persons with atrophy of temporal lobe  and prefrontal area . Additionally, both global cognition and gait speed have been associated with atrophy of corpus callosum . Our findings are only partially supportive of these conclusions. In the linear regression model, usual gait speed was only a borderline predictor of an accelerated cognitive (Table 4).
In the investigation results of characteristics in rehabilitation users, 47% were with up to junior high school in the educational background, and the higher ratio of current medical history showed the results below; 1st was hypertension (47.2%), 2nd was cerebrovascular disorder (22.2%), and 3rd was osteoarthritis (13.8%). According to the classification of O’ Bryant et al., the percentage of people requiring support was calculated with 26 points or less as MCI . Thus, more than half, 55.6% were with MCI. According to the Ministry of Health, Labor and Welfare in Japan, the worst cause of needs for long-term care according to the degree of long-term care in 2010 was osteoarthritis (19.4%), cerebrovascular disorder (24.1%) with that requiring long-term care. Dementia was the most common condition, followed by 20.5% .
High blood pressure in certain circumstances and low blood pressure have been associated with cognitive decline and dementia in community-based studies, suggested that blood pressure may serve as a viable target for primary or secondary dementia prevention . On the other hand, accumulating evidence suggested that hypertension during midlife may be a risk factor for cognitive decline and dementia . Although relationships of elevated blood pressure during the 7th, 8th and 9th decades of life with cognitive outcomes have not known yet, several studies indicated that optimal blood pressure ranges for older adults might have depended on earlier blood pressure characteristics .
Likewise, cognitive stimulation is essential for elders with hypertension, which tend to have reduced gait speed and worse cognitive performance. As contributions of this research, it was expected that the results could guide geriatric nursing care about detection of changes in cognitive or physical performance of elders, coping with health events such as physical frailty syndrome. Moreover, it has a potential to support discussion on planning of interventions that provide positive results for quality of life in this age group.
In summary, gait speed could be used for physical fitness in elderly. Gait speed was the best physical fitness measure for elderly. Gait speed of Rehabilitation users was strongly related to MMSE scores. The determinant at Gait speed was MMSE scores.
The authors express sincere thanks to the members of the research and volunteers who participated as subjects.
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