Search Results (40)

In response to the personalized and precise rehabilitation needs for motor injuries and stroke associated with population aging, this study proposes a design method for an intelligent rehabilitation trainer that integrates Bayesian information gain (BIG) and axis matching techniques. Grounded in the biomechanical characteristics of the human ankle joint, the design fully draws upon biomimetic principles, constructing a 3-PUU-R hybrid serial–parallel bionic mechanism. By mimicking the dynamic variation of the ankle’s instantaneous motion axis and its balance between stiffness and compliance, a three-dimensional digital model was developed, and multi-posture human factor simulations were conducted, thereby achieving a rehabilitation process more consistent with natural human movement patterns. Natural randomized disability grade experimental data were collected for 100 people to verify the validity of the design results. On this basis, a Bayesian information gain framework was established by quantifying the reduction of uncertainty in rehabilitation outcomes through characteristic parameters, enabling the dynamic optimization of training strategies for personalized and precise ankle rehabilitation. The rehabilitation process was modeled as a problem of uncertainty quantification and information gain optimization. Prior distributions were constructed using surface EMG (electromyography) signals and motion trajectory errors, and mutual information was used to drive the dynamic adjustment of training strategies, ultimately forming a closed-loop control architecture of “demand perception–strategy optimization–execution adaptation.” This innovative integration of probabilistic modeling and cross-joint bionic design overcomes the limitations of single-joint rehabilitation and provides a new paradigm for the development of intelligent rehabilitation devices. The deep integration mechanism-based dynamic axis matching and Bayesian information gain holds significant theoretical value and engineering application prospects for enhancing the effectiveness of neural plasticity training. Full article

Objectives: To evaluate the validity, accuracy, and reliability of the G-Force force platform during isometric tests, through comparison with a gold-standard force platform in physically active young adults. Methods: Nine physically active participants (23.67 ± 4.97 years; body mass index: 25.79 ± 3.02 kg/m²) performed isometric posterior lower limb muscle tests per leg, following a standardized warm-up and familiarization protocol. The G-Force platform and compared against a gold-standard device, the Valkyria Trainer Balance (VTB) force platform. The measured variables included Peak Force and peak rate of force development (RFD) at 50, 100 and 150 ms (RFD50, RFD100 and RFD150). Intra- and inter-platform reliability were assessed using intraclass correlation coefficients (ICC), standard error of measurement (SEM), coefficient of variation (CV%), Bland–Altman analysis and Pearson’s correlation coefficients between both platforms. Results: Peak Force showed excellent intra-platform repeatability (ICC = 0.86–0.91) and moderate-to-good inter-platform reliability (ICC = 0.75–0.77), with the G-Force platform generally reporting slightly lower absolute values than VTB. RFD measures demonstrated moderate reproducibility (ICC = 0.75–0.87) and higher variability (CV = 47–57%). Bland–Altman analyses revealed minimal bias for Peak Force, while regression analyses indicated strong, significant associations between G-Force and VTB measurements (R² = 0.55–0.77; β = 0.74–0.88; p < 0.05). Conclusions: The G-Force force platform is a valid, reliable, and low-cost tool for assessing isometric strength in physically active young adults. Full article

Background: Preliminary evidence supports high-intensity functional training (HIFT) for improving various health outcomes in non-disabled adults with overweight/obesity. It remains unknown whether HIFT produces similar benefits in individuals who are overweight/obese and also have a mobility disability (e.g., spinal cord injury, multiple sclerosis)—a population disproportionately affected by obesity-related health conditions and systemic barriers to exercise. This pilot study aimed to evaluate the feasibility and preliminary effects of a 24-week HIFT intervention, delivered at community sites by certified trainers, for adults with mobility disabilities (MDs) who were overweight/obese. Methods: Twenty adults with MD and overweight/obesity (self-reported BMI 25–46 kg/m²) enrolled in a 24-week HIFT intervention (3 days/wk, 60 min sessions) delivered at four community-based facilities by certified trainers. Feasibility indicators included recruitment, retention, and attendance; adverse events were tracked. Effect sizes (Cohen’s d) were calculated for changes in obesity-related measures, physical function, work capacity, and psychological measures from baseline to post-intervention. Results: Feasibility targets were met, with a recruitment rate of 72.2%, 76.9% retention, and 80.7% attendance. Thirteen adverse events occurred. Effects on obesity-related measures ranged from negligible to moderate, with stable weight/BMI, reduced waist circumference (45% ≥ 3 cm decrease), decreased body fat, and increased lean mass. Functional outcome effects ranged from small to large and included grip strength, balance, and walking speed. Large improvements were observed for the endurance, speed, work capacity, and self-reported physical function. Conclusions: A community-based HIFT program is feasible and may improve health outcomes in adults with MD and overweight/obesity. Full article

Collegiate student-athletes are particularly vulnerable to food insecurity (FI). Prevalence rates range from 9.9% to 65%, although research is limited among this population. Background/Objectives: The challenge of balancing academic and degree progression requirements with training and competition demands can increase the risk for FI among student-athletes. Furthermore, insufficient funds for food has been reported for student-athletes living both on campus and off campus. Methods: This qualitative study employed a phenomenological design and constructivist theoretical framework to explore the experiences of athletic trainers, sports dietitians/nutritionists, and other professionals working with student-athletes in identifying and addressing FI among student-athletes via a series of online focus groups. Results: Participants (n = 27, 12 public colleges) had ≥7 years of collegiate athletics work experience, and most had been in their current position for <3 years. Five approaches to FI screening emerged; specifically, no screening, screening varies by team/sport, informal screening, dietitian screening, and formal screening. Emerging social determinants of FI included financial challenges, competing priorities, cultural/societal impacts, limited life skills, and the food environment. All these factors precipitated on a systems level, including individual, team/athletic department, and university/societal tiers. Conclusions: Athletic department and university policies and budgetary decisions emerged as potential antagonists of food security among student-athletes. FI mitigation strategies for student-athletes must go beyond simply addressing individual factors. Obtainment of food security among collegiate student-athletes requires system changes at the team/athletic department and university tiers. Full article

This study aims to analyze the possibility of developing balance ability, highlighting symmetries, asymmetries, and levels of proprioception, in children aged 11–13 from practicing indoor and outdoor climbing and bouldering/escalation exercises. The research subjects were 54 children (both boys and girls) aged 11–13, divided into two groups: an experimental group of 28 students (14 boys and 14 girls) who participated in an extracurricular climbing activity twice a week during the 2023–2024 school year, and a control group of 26 students (13 boys and 13 girls) who did not engage in extracurricular motor activities. During the initial and final evaluations, 12 tests were used to assess balance ability, symmetries, and asymmetries—10 tests were conducted using the Sensbalance MiniBoard 1.0 platform in addition to the Standing Stork test for each leg. The analysis of the results showed statistically significant differences between the groups, with the experimental group recording improvements in symmetry and proprioception related to increased balance levels. This work is addressed to teachers, trainers, and physical therapists who, in the educational process, aim to develop balance and proprioception as objectives that improve children’s motor skills. In conclusion, the study results reveal the impact of a program based on climbing and escalating exercises in extracurricular activities on the development of static and dynamic balance ability. Full article

Objectives: The present study examined the sensory preferences adopted by students over three years of training in a specialized training program for security forces (STPSF). It determines their impact on karate performance metrics. Methods: Thirty-one students aged 20 to 26 (SD = 0.81) completed the modified Visual, Aural, Read/Write, and Kinesthetic questionnaire (VARK), a tool designed to help identify students’ preferred learning styles. This research suggests a theoretical model in which the balanced and optimal engagement of visual, auditory, and kinesthetic modalities rather than a strict mathematical equation might provide an optimal foundation for improving proficiency in martial arts. Balanced engagement of these sensory modalities can foster a deeper understanding of karate techniques, improve performance, minimize dependence on a single sensory channel, and bolster real-time adaptability. The students were tested at two points: once at the beginning of their enrolment and again after completing their three-year training program. Results: After a relatively intensive intervention over three years, the findings suggest a positive shift in the ratio of the primary modalities, moving toward an optimal balance. Considering the ideal sensory balance of 50:50:50%, the visual modality increased from 45.8 to 50.4, approaching the optimal value. The auditory modality, initially above the ideal level at 53.8, adjusted closer to balance, reaching 51.9. In contrast, the kinesthetic modality slightly decreased from 50 to 47.5, indicating a minor deviation from the ideal state. It was further confirmed that a higher technical level, such as the third kyu, exhibits an equal distribution, approaching the optimal use of the three modalities: visual 51.5 auditory 47.6 and kinesthetic 50.7. Moreover, the progress toward an optimal synergy and a more efficient evaluation of situational possibilities within the decision-making process was more frequently noted in females than in male students. Conclusions: Acknowledging students’ sensory processing preferences can assist the teacher, trainer, coach, and student in advancing interaction, optimizing learning strategies, improving performance, promoting analytical skills, and fostering self-assurance and determination. Full article

The back squat (BS) is one of the most effective exercises for enhancing lower limb strength, but an unstable squat can increase shear forces in the lower back. Understanding how to assess the squat stability is useful for avoiding potential sports injury. During the BS, the trunk lean and center of pressure (COP) are relevant to squat safety, and these kinematics can be altered by elevating the heel. However, there is no relevant meta-analysis on the impact of different heel heights on squat stability. This study aims to bridge the gap in the literature by conducting a systematic review and network meta-analysis on how heel elevation affects squat stability. By quantifying the influence of different heel heights on key biomechanical parameters, such as the center of pressure deviation and ankle dorsiflexion, the study provides actionable insights for athletes, trainers, and clinicians. Fourteen articles were included, and the majority of these studies demonstrated that elevated heels (EHs) can reduce COP deviation and trunk lean. In addition, 25 mm heels may be the preferred option for squat stability in the AP direction when COP data and network meta-analysis are combined. However, in the ML direction, the capacity to maintain balance is rather questionable; when ankle peak dorsiflexion is combined, 8 mm heels have higher COP deviation values and 5 mm heels have lower COP deviation values. Regarding limitations, reliance on a single bias assessment tool (Cochrane Risk of Bias Tool) might not fully capture methodological variability across non-RCT studies. Future systematic reviews could consider using multiple bias assessment tools for robust assessment. Full article

This study examined the impact of three pre-season fitness training protocols with different training frequencies (heavy, moderate and light) on the physical abilities and the biochemical indicators of muscle damage and oxidative stress in female basketball athletes as expressed through physiological and biochemical assessments. Also, a comparison and a search for correlations were made between the physiological and biochemical changes that were caused by each protocol. The sample consisted of 28 professional female basketball athletes, who competed in three different teams, and each training protocol was assigned to each of the three teams. The somatometric and performance markers measured were as follows: weight, fat percentage, aerobic capacity, anaerobic capacity, vertical jumping ability, speed, acceleration, explosiveness and maximum lower body part strength. The biochemical measurements consisted of exercise-induced muscle damage (creatine kinase—CK, lactate dehydrogenase—LDH) and oxidative stress markers (protein carbonyls—PCs, glutathione peroxidase—GPx). The three fitness training protocols that were used improved the fitness status of high-level female basketball athletes after 6 weeks during the pre-season period, but they were also accompanied by some significant differences between them (fat percentage, anaerobic capacity, speed and acceleration). The results were also accompanied by an increase in CK and LDH for the three teams and by an increase in GPx for Teams 1 and 3. Also, we concluded that even 4 more or 4 less fitness training units (TUs) during a 6-week basketball preparation period can be considered important to differentiate the outcomes of physiological and biochemical markers. The purpose of this study was to provide more theoretical and practical knowledge to basketball coaches and trainers, so they can optimize the training process during the preparation period and thus maximize the performance of their athletes. Nevertheless, the present study was created with certain limitations, such as the small sample size for each team, the absence of a long-term follow-up or the lack of a control group. Future studies may need to turn their focus on fitness protocols with longer durations, try to differentiate the types of training protocols and attempt to achieve a better balance between maximizing performance and mitigating the muscle damage and oxidative stress levels. Full article

Background/Objectives: Nowadays, body weight management has gained significant consumer attention due to the health megatrend. It plays a key role in preventing diseases, maintaining health, and creating a balanced diet, as well as in mental and physical health. Overweight and obesity are serious problems that can result in various non-communicable diseases; thus, managing the body weight of those who are overweight or obese without pathological changes would help reduce the prevalence of these diseases. By reducing body weight, not only individual health expenses but also public health costs could be reduced. To do so, it is necessary to assess at what levels consumers perceive their own health status, as well as the extent to which they pay attention to body weight management. Our research aimed to contribute to the foundation of public intervention programs by exploring some characteristics of body weight management among Hungarian consumers. Methods: We used a large-sample questionnaire survey involving a total of 550 people. Various statistical methods were used to analyze the data, including descriptive statistics, association tests, and hypothesis tests. Results: According to our results, those who want to lose weight are more engaged in managing their body weight than those who are satisfied with their weight or who want to gain weight, often aiming to reach an ideal weight through diet and exercise, and are willing to invest more in healthier lifestyles, both in terms of their diet and physical activity. In this regard, we did not find significant differences between the genders. Conclusions: Based on our findings, we can conclude that dietitians and doctors should play a more active role in guiding lifestyle changes since the majority of our respondents do not consider them credible sources of information on healthy eating, and they do not consult them on this topic. On the other hand, however, a much larger proportion seek information from them regarding regular physical activity, and after personal trainers, they are considered the second most authentic source of information. Full article

Physical fitness (PF) has been identified as a critical health marker in youth and is significantly influenced by environmental factors, such as the specificity of training involved in different sports. This study investigated PF differences among young athletes who participated in water polo and volleyball to understand how different training programs and environments impact physical development. A sample of 98 youth athletes, including 46 water polo players (46% female; mean age: 13.07 ± 2.27 years) and 52 volleyball players (100% female; mean age: 13.80 ± 1.86 years) was assessed using Handgrip (HG), Standing Long Jump (SLJ), and Progressive Aerobic Cardiovascular Endurance Run (PACER) tests. Results were normalized against European percentile reference values and analyzed using the Mann–Whitney U test. The PACER test revealed a significant difference (U = 639, p < 0.001, r = −0.466), with water polo athletes exhibiting superior cardiorespiratory fitness compared to volleyball players. The HG test also showed significant differences (U = 1571, p = 0.007, r = 0.314), indicating greater grip strength in volleyball players. No significant difference was observed in the SLJ test. These findings underscore the importance of sport-specific training in youth athletes, but also the importance of well-rounded physical development training for all youth sports. Results suggest that practicing different sports that involve different training and environments is significantly associated with certain aspects of PF components. This awareness can guide grassroots coaches and trainers towards effective and balanced training strategies to promote performance and long-term health. Full article

This study characterizes the effects of a postural training program on balance and muscle control strategies in a virtual reality (VR) environment. The Robotic Upright Stand Trainer (RobUST), which applies perturbative forces on the trunk and assistive forces on the pelvis, was used to deliver perturbation-based balance training (PBT) in a sample of 10 healthy participants. The VR task consisted of catching, aiming, and throwing a ball at a target. All participants received trunk perturbations during the VR task with forces tailored to the participant’s maximum tolerance. A subgroup of these participants additionally received assistive forces at the pelvis during training. Postural kinematics were calculated before and after RobUST training, including (i) maximum perturbation force tolerated, (ii) center of pressure (COP) and pelvic excursions, (iii) postural muscle activations (EMG), and (iv) postural control strategies (the ankle and hip strategies). We observed an improvement in the maximum perturbation force and postural stability area in both groups and decreases in muscle activity. The behavior of the two groups differed for perturbations in the posterior direction where the unassisted group moved towards greater use of the hip strategy. In addition, the assisted group changed towards a lower margin of stability and higher pelvic excursion. We show that training with force assistance leads to a reactive balance strategy that permits pelvic excursion but that is efficient at restoring balance from displaced positions while training without assistance leads to reactive balance strategies that restrain pelvic excursion. Patient populations can benefit from a platform that encourages greater use of their range of motion. Full article

Although evidence-based programs have been effective for fall prevention in many communities, older adults living in underserved areas cannot access these services due to the shortage of providers and trainers. In this cross-sectional study, a multi-agency approach was adopted for integrating an evidence-based program, A Matter of Balance (AMOB), into the public health curriculum at a rurally placed university. We assessed student learning as well as the community benefits of fall prevention among those who participated in the AMOB program. Eighty-four percent of the students reported intentions of using AMOB training in their future careers. The average of the items for the effectiveness of “Classroom Training” and “Community Training” provided by the students (n = 25) ranged from 3.52 to 4.32 and 3.48 to 4.36, on a Likert scale (1 = Strongly Disagree to 5 = Strongly Agree), respectively. Older adults who participated in the fall prevention community workshops showed increased confidence in reducing falls, protecting themselves from falling, and becoming steadier on their feet after the training (p < 0.05). Our study demonstrates the value of integrating evidence-based programs such as AMOB in a university curriculum to address rural health disparities related to falls. Full article

Detecting sparse, small, lost persons with only a few pixels in high-resolution aerial images was, is, and remains an important and difficult mission, in which a vital role is played by accurate monitoring and intelligent co-rescuing for the search and rescue (SaR) system. However, many problems have not been effectively solved in existing remote-vision-based SaR systems, such as the shortage of person samples in SaR scenarios and the low tolerance of small objects for bounding boxes. To address these issues, a copy-paste mechanism (ISCP) with semi-supervised object detection (SSOD) via instance segmentation and maximum mean discrepancy distance is proposed (MMD), which can provide highly robust, multi-task, and efficient aerial-based person detection for the prototype SaR system. Specifically, numerous pseudo-labels are obtained by accurately segmenting the instances of synthetic ISCP samples to obtain their boundaries. The SSOD trainer then uses soft weights to balance the prediction entropy of the loss function between the ground truth and unreliable labels. Moreover, a novel evaluation metric MMD for anchor-based detectors is proposed to elegantly compute the IoU of the bounding boxes. Extensive experiments and ablation studies on Heridal and optimized public datasets demonstrate that our approach is effective and achieves state-of-the-art person detection performance in aerial images. Full article

Deep Reinforcement Learning (DeepRL) methods have been widely used in robotics to learn about the environment and acquire behaviours autonomously. Deep Interactive Reinforcement 2 Learning (DeepIRL) includes interactive feedback from an external trainer or expert giving advice to help learners choose actions to speed up the learning process. However, current research has been limited to interactions that offer actionable advice to only the current state of the agent. Additionally, the information is discarded by the agent after a single use, which causes a duplicate process at the same state for a revisit. In this paper, we present Broad-Persistent Advising (BPA), an approach that retains and reuses the processed information. It not only helps trainers give more general advice relevant to similar states instead of only the current state, but also allows the agent to speed up the learning process. We tested the proposed approach in two continuous robotic scenarios, namely a cart pole balancing task and a simulated robot navigation task. The results demonstrated that the agent’s learning speed increased, as evidenced by the rising reward points of up to 37%, while maintaining the number of interactions required for the trainer, in comparison to the DeepIRL approach. Full article

The objective of this study was to validate PLATES for assessing unipodal balance in the field, for example, to monitor ankle instabilities in athletes or patients. PLATES is a pair of lightweight, connected force platforms that measure only vertical forces. In 14 healthy women, we measured ground reaction forces during Single Leg Balance and Single Leg Landing tests, first under laboratory conditions (with PLATES and with a 6-DOF reference force platform), then during a second test session in the field (with PLATES). We found that for these simple unipodal balance tests, PLATES was reliable in the laboratory and in the field: PLATES gives results comparable with those of a reference force platform with 6-DOF for the key variables in the tests (i.e., Mean Velocity of the Center of Pressure and Time to Stabilization). We conclude that health professionals, physical trainers, and researchers can use PLATES to conduct Single Leg Balance and Single Leg Landing tests in the laboratory and in the field. Full article