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14 pages, 689 KiB  
Review
Guidelines for Recommended Footwear for Healthy Children and Adolescents: A Rapid Scoping Review to Characterise the Nature and Extent of Footwear Research and Clinical Policy Guidelines
by Liam Hughes, Mark I. Johnson, Nic Perrem and Peter Francis
Healthcare 2025, 13(13), 1578; https://doi.org/10.3390/healthcare13131578 - 1 Jul 2025
Viewed by 482
Abstract
Background/Objectives: Clinical guidelines for children’s footwear vary widely across governmental and clinical sources, reflecting inconsistencies in best practices for paediatric foot health. These discrepancies arise from differing research interpretations, regional priorities, and clinical expertise. This scoping review evaluates existing guidelines and examines [...] Read more.
Background/Objectives: Clinical guidelines for children’s footwear vary widely across governmental and clinical sources, reflecting inconsistencies in best practices for paediatric foot health. These discrepancies arise from differing research interpretations, regional priorities, and clinical expertise. This scoping review evaluates existing guidelines and examines the evidence supporting them. The objective of this scoping review was to identify and map existing footwear guidelines for healthy children and adolescents across governmental, professional, and clinical sources, and to evaluate the type and strength of evidence underpinning these recommendations. Methods: A systematic search of PubMed, Google Scholar, ScienceDirect, and governmental databases was conducted. Studies on footwear recommendations for healthy children aged 18 months to 18 years were included. Articles published between 1970 and 2024 were considered, as 1970 marked the first mass marketing of running shoes/trainers. Results: Footwear guidelines lack standardisation, with variations in definitions, recommendations, and supporting evidence. Key inconsistencies exist in parameters such as fit, flexibility, and toe allowance, with most recommendations based on expert opinion rather than empirical data. Discrepancies in commercial footwear sizing further complicate proper fit assessment. Conclusions: This is the first comprehensive review of children’s footwear guidelines, integrating governmental, professional body, and clinical recommendations. While there is consensus on the importance of properly fitting shoes, the literature reveals inconsistencies and reliance on expert opinion rather than high-quality research. This review highlights the need for standardised, evidence-based criteria to guide footwear recommendations and serves as a foundation for future research aimed at bridging the gap between research and practice. Full article
(This article belongs to the Special Issue Understanding Foot Health: An Evolutionary Perspective)
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11 pages, 28340 KiB  
Article
Self-Adapting Foot Orthosis Inlay Facilitates Handling and Reduces Plantar Pressure Compared to Vacuum-Based Technology
by Alexander Milstrey, Carolin Horst, Stella Gartung, Ann-Sophie Weigel, Richard Stange and Sabine Ochman
J. Clin. Med. 2025, 14(10), 3384; https://doi.org/10.3390/jcm14103384 - 13 May 2025
Viewed by 410
Abstract
Background/Objectives: Orthoses are commonly used in the treatment of various foot and ankle injuries and deformities. An effective technology in foot orthoses is a vacuum system to improve the fit and function of the orthosis. Recently, a new technology was designed to [...] Read more.
Background/Objectives: Orthoses are commonly used in the treatment of various foot and ankle injuries and deformities. An effective technology in foot orthoses is a vacuum system to improve the fit and function of the orthosis. Recently, a new technology was designed to facilitate the wearing of the foot orthoses while maintaining function without the need for vacuum suction. Methods: A plantar dynamic pressure distribution measurement was carried out in 25 healthy subjects (13 w/12 m, age 23–58 y) using capacitive measuring insoles in two differently designed inlays within the VACOpedes® orthosis (Group A: vacuum inlay vs. Group B: XELGO® inlay) and a regular off-the-shelf shoe (Group C, OTS). The peak plantar pressure, mean plantar pressure and maximum force were analyzed in the entire foot and in individual regions of the medial and lateral forefoot, the midfoot and the hindfoot. Finally, the wearing comfort was compared using a visual analog scale from 1 to 10 (highest comfort). Results: The peak pressure of both inlays was significantly lower than in the OTS shoe (A: 230.6 ± 44.6 kPa, B: 218.0 ± 49.7 kPa, C: 278.6 ± 50.5 kPa; p < 0.001). In a sub-analysis of the different regions, the XELGO® inlay significantly reduced plantar pressure in the medial forefoot compared to the vacuum orthosis (A: 181.7 ± 45.7 kPa, B: 158.6 ± 51.7 kPa, p < 0.002). The wearing comfort was significantly higher with the XELGO® inlay compared to the vacuum inlay (A: 5.68/10, B: 7.24/10; p < 0.001). Conclusions: The VACOpedes® orthosis with a new XELGO® inlay showed at least equivalent relief in all pressure distribution measurements analyzed and greater relief in the forefoot area than the VACOpedes® orthosis with a vacuum inlay, as well as increased wearing comfort. Full article
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15 pages, 2535 KiB  
Article
One Shoe to Fit Them All? Effect of Various Carbon Plate Running Shoes on Running Economy in Male and Female Amateur Triathletes and Runners at Individual Training and Race Paces
by Marlene Riedl, Carlo von Diecken and Olaf Ueberschär
Appl. Sci. 2024, 14(24), 11535; https://doi.org/10.3390/app142411535 - 11 Dec 2024
Cited by 1 | Viewed by 4024
Abstract
Carbon plate running shoes (CPRSs) have gained widespread popularity among elite and amateur runners, representing one of the most substantial changes in running gear over the past decade. Compared to elite runners, however, amateurs run at lower speeds and show more diverse running [...] Read more.
Carbon plate running shoes (CPRSs) have gained widespread popularity among elite and amateur runners, representing one of the most substantial changes in running gear over the past decade. Compared to elite runners, however, amateurs run at lower speeds and show more diverse running styles. This is a meaningful difference as many previous studies on CPRSs focus either on highly trained male runners and higher speeds or only on a single CPRSs manufacturer. The present study aims at bridging this gap by investigating how CPRSs from four different manufacturers affect running economy in amateurs of both sexes at their individual running speeds. For this purpose, 21 trained amateur triathletes (12 men; 9 women) completed an incremental treadmill test until volitional exhaustion, yielding running speeds at ventilatory thresholds 1 (vVT1) and 2 (vVT2). In a second session, subjects ran five trials of 3 × 3 min (speeds of 90% vVT1, ½ (vVT1 + vVT2), and 100% vVT2), wearing one out of four different pairs of CPRSs or their own preferred non-CPRS shoes in each trial. Our results show that tested CPRS models resulted in a significant reduction in the mean energy cost of transport, compared to the non-CPRS control condition, with Cohen’s d amounting to −1.52 (p = 0.016), 2.31 (p < 0.001), 2.57 (p < 0.001), and 2.80 (p < 0.001), respectively, although effect sizes varied substantially between subjects and running speeds. In conclusion, this study provides evidence that amateur athletes may benefit from various manufacturers’ CPRS models at their typical running speeds to a similar degree as highly trained runners. It is recommended that amateur athletes evaluate a range of CPRSs and select the shoe that elicits the least subjective sensation of fatigue over a testing distance of at least 400–1000 m. Full article
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14 pages, 1745 KiB  
Article
Using Fitness Tracker Data to Overcome Pressure Insole Wear Time Challenges for Remote Musculoskeletal Monitoring
by Cameron A. Nurse, Katherine M. Rodzak, Peter Volgyesi, Brian Noehren and Karl E. Zelik
Sensors 2024, 24(23), 7717; https://doi.org/10.3390/s24237717 - 3 Dec 2024
Viewed by 1432
Abstract
Tibia shaft fractures are common lower extremity fractures that can require surgery and rehabilitation. However, patient recovery is often poor, partly due to clinicians’ inability to monitor bone loading, which is critical to stimulating healing. We envision a future of patient care that [...] Read more.
Tibia shaft fractures are common lower extremity fractures that can require surgery and rehabilitation. However, patient recovery is often poor, partly due to clinicians’ inability to monitor bone loading, which is critical to stimulating healing. We envision a future of patient care that includes at-home monitoring of tibia loading using pressure-sensing insoles. However, one issue is missing portions of daily loading due to limited insole wear time (e.g., not wearing shoes all day). Here, we introduce a method for overcoming this issue with a wrist-worn fitness tracker that can be worn all day. We developed a model to estimate tibia loading from fitness tracker data and evaluated its accuracy during 10-h remote data collections (N = 8). We found that a fitness tracker, with trained and calibrated models, could effectively supplement insole-based estimates of bone loading. Fitness tracker-based estimates of loading stimulus—the minute-by-minute weighted impulse of tibia loading—showed a strong fit relative to insole-based estimates (R2 = 0.74). However, insoles needed to be worn for a minimum amount of time for accurate estimates. We found daily loading stimulus errors less than 5% when insoles were worn at least 25% of the day. These findings suggest that a multi-sensor approach—where insoles are worn intermittently and a fitness tracker is worn continuously throughout the day—could be a viable strategy for long-term, remote monitoring of tibia loading in daily life. Full article
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16 pages, 657 KiB  
Review
Footwear and Foot Health: Unveiling the Role of Proper Shoe Fit in Preventing Podiatric Issues and Enhancing Well-Being
by Roberto Tedeschi, Federica Giorgi and Danilo Donati
Appl. Sci. 2024, 14(21), 9938; https://doi.org/10.3390/app14219938 - 30 Oct 2024
Cited by 5 | Viewed by 5746
Abstract
Background: The appropriate choice of footwear is crucial for foot health, yet its impact on different populations and medical conditions remains understudied. This review explores the effect of shoe fit on the prevention of podiatric disorders and overall well-being. Methods: The research included [...] Read more.
Background: The appropriate choice of footwear is crucial for foot health, yet its impact on different populations and medical conditions remains understudied. This review explores the effect of shoe fit on the prevention of podiatric disorders and overall well-being. Methods: The research included major academic databases such as MEDLINE, Cochrane Central, Scopus, and PEDro, using specific keywords. A scoping review was conducted following the Joanna Briggs Institute methodology, encompassing studies on shoe fit across diverse populations and conditions. Medical databases and grey literature were also included. Results: Five studies were included, covering topics such as footwear advice for women over 50, the effect of shoes in preventing calluses under the metatarsals, the effectiveness of a shoe-related intervention for gout patients, and the impact of custom-fitted shoes on physical activity in children with Down syndrome. Results showed that well-fitting shoes can prevent callus formation, but the efficacy of custom-fitted shoes for increasing physical activity requires further research. Conclusions: The choice of appropriate footwear should not be solely based on aesthetic considerations but rather on the specific needs of each individual. Physicians should consider providing advice on appropriate shoe characteristics as a primary intervention Full article
(This article belongs to the Section Applied Biosciences and Bioengineering)
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14 pages, 1818 KiB  
Article
Effect of Custom-Made Foot Orthotics on Multi-Segment Foot Kinematics and Kinetics in Individuals with Structural Hallux Limitus
by Magdalena Martinez-Rico, Gabriel Gijon-Nogueron, Ana Belen Ortega-Avila, Luis E. Roche-Seruendo, Ana Climent-Pedrosa, Enrique Sanchis-Sales and Kevin Deschamps
Sensors 2024, 24(19), 6430; https://doi.org/10.3390/s24196430 - 4 Oct 2024
Cited by 2 | Viewed by 2124
Abstract
The first metatarsophalangeal joint (MTPJ) and the first ray are crucial in walking, particularly during propulsion. Limitation in this joint’s sagittal plane motion, known as hallux limitus, can cause compensatory movements in other joints. Some studies assessed the impact of various foot orthoses [...] Read more.
The first metatarsophalangeal joint (MTPJ) and the first ray are crucial in walking, particularly during propulsion. Limitation in this joint’s sagittal plane motion, known as hallux limitus, can cause compensatory movements in other joints. Some studies assessed the impact of various foot orthoses designs on the foot biomechanics; however, a comprehensive understanding is lacking. This study compared the effects of two custom-made foot orthoses (CFOs) on the foot joint kinematics and kinetics in patients with structural hallux limitus (SHL). In this quasi-experimental study, 24 patients with hallux limitus were assessed in three conditions: (i) barefoot, (ii) shod with a cut-out custom foot orthosis (cut-out CFO), and (iii) shod with an anterior forefoot-stabilized element custom foot orthosis (AFSE CFO), fitted into a minimalist neoprene shoe. Multi-segment foot kinematics and kinetics were assessed during the stance phase of the gait. A decrease in ankle and midfoot inversion, as well as in ankle plantarflexion, was found in both orthotic conditions. Regarding the first MTPJ, a greater dorsiflexion was observed with the patient being barefoot compared to both of the conditions under study. From the current finding, it should be concluded that neither of the custom foot orthoses produced the predefined functional effects. Full article
(This article belongs to the Special Issue Sensors for Human Posture and Movement)
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11 pages, 1034 KiB  
Case Report
Silicone Shoes for the Treatment of Foot Pad Dermatitis (Bumblefoot) in Pet Chickens—A Retrospective Case Series
by Cornelia Konicek, Michaela Gumpenberger and Johannes Peter Schramel
Animals 2024, 14(17), 2581; https://doi.org/10.3390/ani14172581 - 5 Sep 2024
Cited by 2 | Viewed by 1745
Abstract
Backyard chickens often suffer from foot pad dermatitis (FPD), a condition exacerbated by poor husbandry, nutritional deficiencies, and obesity. Pressure-relieving bandages, commonly used in the treatment of FPD, are impractical for outdoor chickens as they quickly become wet and dirty, necessitating daily changes [...] Read more.
Backyard chickens often suffer from foot pad dermatitis (FPD), a condition exacerbated by poor husbandry, nutritional deficiencies, and obesity. Pressure-relieving bandages, commonly used in the treatment of FPD, are impractical for outdoor chickens as they quickly become wet and dirty, necessitating daily changes that are often unfeasible. This retrospective study explores the use of custom-fit silicone shoes created via 3D-printed molds as an alternative to traditional bandages. CT scans were used to design shoes adapted from a design used for birds of prey. Over three years, 16 chickens with varying degrees of FPD were treated. The results demonstrated that silicone shoes were an effective treatment for FPD, allowing outdoor activity and facilitating daily lesion care without frequent bandage changes. The median shoe-wearing period was 14 days, and most owners provided positive feedback. Despite some attachment issues, the occurrence of secondary pressure marks, and feather regrowth challenges, the silicone shoes offered better ventilation, reusability, and consistent pressure relief compared to traditional bandages. This study concludes that silicone shoes are a viable solution for managing FPD in backyard chickens, promoting faster healing and improving owner compliance. Full article
(This article belongs to the Section Poultry)
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23 pages, 4043 KiB  
Review
Recent Innovations in Footwear and the Role of Smart Footwear in Healthcare—A Survey
by Pradyumna G. Rukmini, Roopa B. Hegde, Bommegowda K. Basavarajappa, Anil Kumar Bhat, Amit N. Pujari, Gaetano D. Gargiulo, Upul Gunawardana, Tony Jan and Ganesh R. Naik
Sensors 2024, 24(13), 4301; https://doi.org/10.3390/s24134301 - 2 Jul 2024
Cited by 5 | Viewed by 12696
Abstract
Smart shoes have ushered in a new era of personalised health monitoring and assistive technologies. Smart shoes leverage technologies such as Bluetooth for data collection and wireless transmission, and incorporate features such as GPS tracking, obstacle detection, and fitness tracking. As the 2010s [...] Read more.
Smart shoes have ushered in a new era of personalised health monitoring and assistive technologies. Smart shoes leverage technologies such as Bluetooth for data collection and wireless transmission, and incorporate features such as GPS tracking, obstacle detection, and fitness tracking. As the 2010s unfolded, the smart shoe landscape diversified and advanced rapidly, driven by sensor technology enhancements and smartphones’ ubiquity. Shoes have begun incorporating accelerometers, gyroscopes, and pressure sensors, significantly improving the accuracy of data collection and enabling functionalities such as gait analysis. The healthcare sector has recognised the potential of smart shoes, leading to innovations such as shoes designed to monitor diabetic foot ulcers, track rehabilitation progress, and detect falls among older people, thus expanding their application beyond fitness into medical monitoring. This article provides an overview of the current state of smart shoe technology, highlighting the integration of advanced sensors for health monitoring, energy harvesting, assistive features for the visually impaired, and deep learning for data analysis. This study discusses the potential of smart footwear in medical applications, particularly for patients with diabetes, and the ongoing research in this field. Current footwear challenges are also discussed, including complex construction, poor fit, comfort, and high cost. Full article
(This article belongs to the Section Wearables)
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15 pages, 872 KiB  
Review
Intervention Hypothesis for Training with Whole-Body Vibration to Improve Physical Fitness Levels: An Umbrella Review
by Luca Petrigna, Alessandra Amato, Martina Sortino, Bruno Trovato, Marta Zanghì, Federico Roggio and Giuseppe Musumeci
J. Funct. Morphol. Kinesiol. 2024, 9(2), 100; https://doi.org/10.3390/jfmk9020100 - 6 Jun 2024
Cited by 2 | Viewed by 2660
Abstract
Whole-body vibration (WBV) is a training modality, and it seems to be a safe and efficient exercise especially to improve different aspects of physical fitness in different populations. The protocols for WBV are still not standardized. The difficulty in comparing the data confuses [...] Read more.
Whole-body vibration (WBV) is a training modality, and it seems to be a safe and efficient exercise especially to improve different aspects of physical fitness in different populations. The protocols for WBV are still not standardized. The difficulty in comparing the data confuses the real efficacy of this instrument. Consequently, the objective of this umbrella review is to analyze the protocols previously adopted and eventually to propose a standard operating procedure for WBV training. Systematic review and meta-analysis of randomized controlled trials on WBV were searched on the electronic databases PubMed, Web of Science, and Scopus until 18 March 2024. A quality assessment of the studies included has been performed. A total of 20 studies were included in this umbrella review and frequency, magnitude, and amplitude intensity data were recorded. Detailed information about the protocols (static or dynamic exercises, barefoot or with shoes, intensity duration, weekly frequency, and vibration characteristics) was also collected. WBV presents widely different protocols. Consequently, a standard operating procedure has not been proposed for WBV training. A hypothesis of intervention was instead written in which parameters for frequency, amplitude, acceleration, and training mode were proposed. Full article
(This article belongs to the Section Functional Anatomy and Musculoskeletal System)
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12 pages, 582 KiB  
Systematic Review
A Systematic Review of Effects on ACL Injury of Soccer Shoe Outsoles, Soccer Playing Field Surfaces, and Outsole–Surface Interface
by Antonio Cicchella and Jierui He
Encyclopedia 2024, 4(2), 888-899; https://doi.org/10.3390/encyclopedia4020057 - 24 May 2024
Cited by 1 | Viewed by 4596
Abstract
Soccer is a sport with a high incidence of injuries. The most common injury occurs when the anterior cruciate ligament of the knee has undergone a sprain, strain, or partial or total rupture. Besides fitness factors (e.g., proprioception, balance and strength capabilities), a [...] Read more.
Soccer is a sport with a high incidence of injuries. The most common injury occurs when the anterior cruciate ligament of the knee has undergone a sprain, strain, or partial or total rupture. Besides fitness factors (e.g., proprioception, balance and strength capabilities), a principal cause of ACL injuries is sport shoes and playing surfaces. Especially with the emergence of artificial surfaces (rubbers, turfs, concrete, asphalt, red turf), the ACL injuries dramatically increase. The cost of ACL injuries is high both in terms of career termination and in social and economic costs. Thus, it is necessary to understand the impact of sport shoes and playing surfaces on the ACL and how it can be mitigated. The present literature review followed the PRISMA methodology to identify the major biomechanical factors influencing the behavior of surfaces and shoes in relation to the ACL damage. Fifty-eight papers were identified. After reviewing the mechanism of injuries, we identified several distinct factors: type of outsole and mechanical arrangement of the outsoles; shear forces; characteristics of artificial turf surfaces; effect of weather on artificial surface aging and change in mechanical characteristics; outsole/ground interface; and the frictional, tractional and rotational forces in the pathogenesis of ACL injuries in soccer. Full article
(This article belongs to the Section Medicine & Pharmacology)
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14 pages, 1256 KiB  
Protocol
Protocol Article: A Cross-Sectional Evaluation of Children’s Feet and Lower Extremities
by Christian Wong, Christina Ystrøm Bjerge, Ales Jurca, Michael Mørk Petersen, Soren Boedtker, Andreas Balslev-Clausen and Steen Harsted
Methods Protoc. 2023, 6(6), 115; https://doi.org/10.3390/mps6060115 - 1 Dec 2023
Cited by 4 | Viewed by 5417
Abstract
Background: The health of children’s lower extremities and feet is a focus area for caregivers and healthcare professionals such as doctors, school nurses, and podiatrists. Our study aims to investigate the general health status of Danish children’s lower extremities and feet to identify [...] Read more.
Background: The health of children’s lower extremities and feet is a focus area for caregivers and healthcare professionals such as doctors, school nurses, and podiatrists. Our study aims to investigate the general health status of Danish children’s lower extremities and feet to identify anthropometric parameters that might be preconditions for pain and evaluate for foot diseases and whether they are associated with pain intensity and location, three-dimensional foot dimensions and foot pressure mapping, shoe dimensions, types and intensity of sports activity, quality of life, and foot health. The aim is that we will be able to identify parameters pre-dispositioning for pain, thus providing recommendations for sports activities in relation to the anthropometric conditions of a child as a potential preventive measure for pain. This analysis will be stratified by socioeconomic status on a group level, and this perspective will be able to provide preventative recommendations to prevent pain. Methods: This study is a cross-sectional examination of a thousand children in the first, fifth, and ninth grades in randomized selected Danish primary schools. We will perform a clinical examination of the lower extremities and feet for misalignments, deformities, and diseases as well as rotational status and range of motion. Moreover, we will evaluate their pain levels, sports activities, three-dimensional foot dimensions, plantar pressure, footwear, and patient-related outcome measures (PROMs) for foot health and quality of life. Results: We aim to provide an anthropometrical overview of the lower extremities and feet in children. The obtained basic understanding of healthy normal material in children will be analyzed for its relationships with pain level, sports activities, and socioeconomic status on a group level. This could potentially provide us with an understanding of the factors that impact lower extremity and foot diseases in children. In conclusion, examining children’s lower extremities and feet in Danish primary schools is a step toward identifying areas of improvement in self-care and shoe fitting, mapping podiatry-related needs of care in children’s feet, and providing parental recommendations for preventive actions on shoe fitting and the choice and intensity of sports activity concerning pain. Conclusions: The tenet of this study is a long-term follow-up to evaluate the long-term socioeconomic course on a group level, foot status, and sports activity, using patient-related outcome measures evaluating quality of life and other lifestyle factors such as emotional functioning, social functioning and interaction, and school functioning. Potentially, this will improve children’s quality of life and prevent future diseases. Full article
(This article belongs to the Section Public Health Research)
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16 pages, 1298 KiB  
Systematic Review
The Use of Wearable Monitoring Devices in Sports Sciences in COVID Years (2020–2022): A Systematic Review
by Damir Pekas, Josipa Radaš, Mario Baić, Iva Barković and Ivan Čolakovac
Appl. Sci. 2023, 13(22), 12212; https://doi.org/10.3390/app132212212 - 10 Nov 2023
Cited by 8 | Viewed by 3543
Abstract
Purpose: Given the growth in the use of wearable measuring technology, this study aimed to investigate the frequency of writing about wearable monitoring devices in the field of sports sciences and sports-related health professions during the years affected by the COVID-19 pandemic (2020 [...] Read more.
Purpose: Given the growth in the use of wearable measuring technology, this study aimed to investigate the frequency of writing about wearable monitoring devices in the field of sports sciences and sports-related health professions during the years affected by the COVID-19 pandemic (2020 to 2022). The goal was to observe the number of studies right before the quarantine and during the first years of pandemic. Methodology: A systematic literature analysis was performed in the Web of Science Core Collection (WoS CC) and Scopus databases in March 2023. The filters used in the search were the following: original scientific papers in the English language and open access. The research field was sports sciences in the past three years (2020–2022) in the Wos CC, and health professions and medicine in Scopus. Results: The initial search resulted in 54 studies in the WoS, 16 of which were included in a detailed qualitative analysis, and 297 studies in Scopus with 19 of them analyzed (35 altogether). The keywords used were “fitness watch” (sport watch, smartwatch), “smart shoes”, “smart clothing”, “smart ring”, “smart belt”, and “smart glasses”. In the past three years, there has been a steady increase in the number of studies using smart monitoring devices to measure their data (nine in 2020, nine in 2021, and seventeen in 2022). Results showed that the most used device is a smartwatch, while the most carried out studies were about physical activity and daily activities of living. Furthermore, there are more studies about measuring devices being used as testing equipment than about device performance in general. Conclusions: This study summarizes various research conducted in the field of sports with the use of wearable measuring devices to determine the frequency of use of such devices in sport studies. Full article
(This article belongs to the Special Issue The Role of Wearable Technology in Sports Science and Medicine)
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16 pages, 4332 KiB  
Article
Design and Fabrication of Polymer Triboelectric Nanogenerators for Self-Powered Insole Applications
by You-Jun Huang and Chen-Kuei Chung
Polymers 2023, 15(20), 4035; https://doi.org/10.3390/polym15204035 - 10 Oct 2023
Cited by 6 | Viewed by 2396
Abstract
Triboelectric nanogenerators (TENGs) are a kind of mechanical energy harvester with a larger force sensing range and good energy conversion, which is often applied to human kinetic energy collection and motion sensing devices. Polymer materials are the most commonly used materials in TENGs’ [...] Read more.
Triboelectric nanogenerators (TENGs) are a kind of mechanical energy harvester with a larger force sensing range and good energy conversion, which is often applied to human kinetic energy collection and motion sensing devices. Polymer materials are the most commonly used materials in TENGs’ triboelectric layers due to their high plasticity and good performance. Regarding the application of TENGs in insoles, research has often used brittle Teflon for high output performance together with hard materials, such as springs, for the mechanism to maintain its stability. However, these combined materials increase the weight and hardness of the insoles. Here, we propose a polyethylene terephthalate (PET)-based TENG with a micro-needle polydimethylsiloxane (PDMS) elastomer, referred to as MN-PDMS-TENG, to enhance performance and maintain comfort flexibility, and structural stability. Compared with a flat PDMS, the TENG with a microstructure enhances the output open-circuit voltage (Voc) from 54.6 V to 129.2 V, short-circuit current (Isc) from 26.16 μA to 64.00 μA, power from 684 µW to 4.1 mW, and ability to light up from 70 to 120 LEDs. A special three-layer TENG insole mechanism fabricated with the MN-PDMS-TENG and elastic materials gives the TENG insole high stability and the ability to maintain sufficient flexibility to fit in a shoe. The three-layer TENG insole transforms human stepping force into electric energy of 87.2 V, which is used as a self-powered force sensor. Moreover, with the calibration curve between voltage and force, it has a sensitivity of 0.07734 V/N with a coefficient of determination of R2 = 0.91 and the function between force and output voltage is derived as F = 12.93 V − 92.10 under human stepping force (300~550 N). Combined with a micro-control unit (MCU), the three-layer TENG insole distinguishes the user’s motion force at different parts of the foot and triggers a corresponding device, which can potentially be applied in sports and on rehabilitation fields to record information or prevent injury. Full article
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12 pages, 6902 KiB  
Article
Effects of Customized 3D-Printed Insoles in Patients with Foot-Related Musculoskeletal Ailments—A Survey-Based Study
by Salman Shaikh, Bhakti Jamdade and Arnab Chanda
Prosthesis 2023, 5(2), 550-561; https://doi.org/10.3390/prosthesis5020038 - 7 Jun 2023
Cited by 29 | Viewed by 9674
Abstract
The prevalence of individuals with flat feet and high arches is very high (between 15% to 37%), which can often lead to other orthopedic complications. Three-dimensional-printed insoles are being studied and validated for their effects in correcting these highly prevalent foot disorders. Highly [...] Read more.
The prevalence of individuals with flat feet and high arches is very high (between 15% to 37%), which can often lead to other orthopedic complications. Three-dimensional-printed insoles are being studied and validated for their effects in correcting these highly prevalent foot disorders. Highly customizable parameters while printing the insole allows for precise correction of foot biomechanics. In this study, 200 patients suffering from various foot-related problems and joint pain were given 3d-printed insoles (designed using plantar pressure systems and clinical practitioner’s assessment) to use in their footwear. Tested activities included standing, walking, running, sports, and gym workout. Customization of insoles included custom density, heel cup, heel rise, medial arch height, and lateral wedge. Based on the patient history, additional podiatry elements were provided for patients with diabetes. Each insole was designed as per the insole profile of the shoe with a comfortable fit. These insoles were found to be effective in alleviating pain for more than 90% of the patients and provided a longer life cycle with effective orthotic correction (for >16 months of daily use). This paper presents the post-use effects (6–18 months) of custom 3D-printed insoles. Full article
(This article belongs to the Special Issue Recent Advances in Foot Prosthesis and Orthosis)
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23 pages, 10969 KiB  
Article
Rediscovering the Lost Roman Landscape in the Southern Trieste Karst (North-Eastern Italy): Road Network, Land Divisions, Rural Buildings and New Hints on the Avesica Road Station
by Federico Bernardini
Remote Sens. 2023, 15(6), 1506; https://doi.org/10.3390/rs15061506 - 8 Mar 2023
Cited by 3 | Viewed by 2690
Abstract
An interdisciplinary study of the ancient landscape of the Trieste Karst (north-eastern Italy) is presented in this paper. Airborne Laser Scanning (ALS) has been applied to obtain high-resolution topography of the 25 km2 investigated area in order to identify potential archaeological anomalies. [...] Read more.
An interdisciplinary study of the ancient landscape of the Trieste Karst (north-eastern Italy) is presented in this paper. Airborne Laser Scanning (ALS) has been applied to obtain high-resolution topography of the 25 km2 investigated area in order to identify potential archaeological anomalies. The ALS-derived high-resolution Digital Terrain Models have been visualized and managed using QGIS and Relief Visualization Toolbox. Possible archaeological anomalies have been verified through field surveys and interpreted using a multidisciplinary approach mainly based on the collection of associated archaeological materials and geomorphological and stratigraphic evidence. From a methodological perspective, the elaboration and study of ALS-derived images, and in particular the local relief model visualization, combined with the collection of Roman shoe hobnails, have proven to be effective approaches for the certain identification and dating of Roman roads in karst environments. The obtained results have revealed an almost completely unknown Roman landscape: the investigated area was crossed by important public roads, whose layout has been accurately reconstructed for a total length of over 10 km, and occupied by large country estates, sometimes enclosed within boundary walls perfectly fitting the Roman land division grid. One of the identified buildings could correspond to a road station, perhaps the Avesica known from ancient itinerary documents—i.e., the itinerarium Antonini Augusti—due to its position and proximity to a major road junction. Full article
(This article belongs to the Special Issue Application of Remote Sensing in Cultural Heritage Research)
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