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The increasingly frequent use of electric drives is a new direction of development in personal transport. Sometimes these drives take over the work of human muscles, and sometimes they only support them. This is particularly evident in means of transport such as bicycles and scooters, but also in transporting people with disabilities. This study questions whether this is the only right development direction, and explores the possibility of developing means of transport for the more effective use of human muscles by proposing new structural solutions. We identified that such an action favors the minimization of the environmental load generated by technical facilities and, at the same time, may be a response to social needs resulting from the principles of sustainable development. This paper presents the operation principle of the innovative Wheelchair Cam-thread Drive (WCD), followed by field tests, laboratory measurements and biomechanical analyses of the WCD, comparing it with a typical Wheelchair Push-rim Drive (WPD). We found that the WCD allows efficient driving on flat and level surfaces, but its propulsion method can adversely alter the location of the center of gravity on the human-wheelchair system. A brake is also required to control the driving speed. Ultimately, the WCD was found to put less strain on the human movement system, so it could be used for rehabilitation exercises. The WCD appears to be a promising design, deserving further research into the drive biomechanics and the optimization of the mechanism operation. Such an innovative manual drive presents an interesting alternative to electric drives.

Objective. This study assesses and compares the mental health status of people with multiple sclerosis (PwMS) in Poland during the second wave of the Coronavirus Disease 2019 (COVID-19) pandemic (November 2020) to a similar group whose mental health status was examined in November 2017. It also analyzed the psychological resources such as self-efficacy and health locus of control (HLC) and their relationship to mental health in both groups. Methods. Cross-sectional study included two groups of PwMS with 113 respondents each. The respondents completed the General Health Questionnaire-12 and questionnaires for assessing self-efficacy and HLC. The clinical and demographic data of participants were also collected. Results. No differences in mental health status were observed between the studied groups. A hierarchical regression model of the group studied in 2020 revealed that general self-efficacy (β = −0.21, p = 0.032), HLC—internal (β = −0.21, p = 0.035), and education (β = −0.18, p = 0.048) explained 18% of the variance in the mental health of PwMS, whereas according to the model of the group assessed in 2017 self-efficacy (β = –0.31, p < 0.001), HLC—chance (β = 0.45, p < 0.001), and HLC—internal (β = −0.37, p < 0.001) explained 48% of the variance. Conclusions. Study results suggest that the pandemic and the related lockdown had no effect on the mental health status of PwMS. At the same time, it was noted that well known determinants of mental health such as self-efficacy and HLC seemed to retain their prominent role for mental functioning in the pandemic.

Introduction: In connection with the design of a seaworthy yacht for persons with disabilities, authors conduct a risk analysis and consider the safety aspects arising from these risks. In the context of tourism and recreation for people with disabilities, this represents a new issue in the literature. Aim: The aim of the analysis was a multi-aspect evaluation of the hazards that occur when sailors with disabilities carry out typical activities on a yacht. The recommendations arising from the conducted research were used when designing the structure of a staysail schooner intended to be sailed by people with disabilities. Methods: Two methods of risk analysis were adopted. A preliminary hazard analysis (PHA) was carried out with the purpose of identifying and evaluating the possibility of people with various types of disabilities carrying out activities on a yacht. A process hazard analysis (PRHA) was based on a four-degree structure of functions with 31 component operations, relating to both sailing and living on a yacht. This methodology was used by the authors in sailing for the first time when the yacht’s equipment was designed for persons with disabilities. Results: The evaluation covered the adaptation of the yacht for sailing by people with disabilities and considered the various functions that would need to be carried out by these people. A PRHA matrix was created, consisting of 1,116 fields. Authors found that safe execution of many of the relevant functions by people with various types of disabilities was indicated. Conclusions: Based on the results of the PRHA, a set of new guidelines was created for permanent and temporary adaptations of a yacht in the context of the degrees and causes of disabilities.

Introduction. The aim of the study was to verify whether long-term practise of the basic kata stances in Shotokan karate contributes to the occurrence of pain in the lower extremities and lumbar spine. Material and methods. The study was conducted on a group of men taking part in Shotokan karate kata tournaments whose age ranged from 15 to 60 years with training experience between 5 and 42 years. A total of 57 valid questionnaires composed of 31 questions were selected. Results. The percentage of the respondents who complained of musculoskeletal pain was 82% (the most common locations included: 34% knee, 28% hip, 13% ankle, 11% lumbar spine); this group was then divided into 3 subgroups with respect to the length of training experience. They were compared with a group of subjects who did not experience any pain which was divided into subgroups according to the same criteria. In the first group, with less than 10 years of training experience, 75% of the subjects experienced musculoskeletal pain, in the second subgroup, 10 to 15 years of training experience, 81% suffered from pain and in the last subgroup, over 15 years of training experience, 86% of the athletes complained of pain. Conclusions. The occurrence of pain in the joints of the lower extremities and lumbar spine confirms that the ailments result from performing the basic stances. There is evidence for a relation between the length of training experience and the occurrence of pain in athletes taking part in kata tournaments.