Nicholas G Gomez, Mark A Gomez, Bruce A MacWilliams, K Bo Foreman
{"title":"Position of Swing-Phase Foot Relative to Stance-Phase Foot at Minimum Toe Clearance: The Effect of Walking Speed.","authors":"Nicholas G Gomez, Mark A Gomez, Bruce A MacWilliams, K Bo Foreman","doi":"10.1123/jab.2025-0327","DOIUrl":"10.1123/jab.2025-0327","url":null,"abstract":"<p><p>Minimum toe clearance (MTC) location relative to the stance-phase foot, as well as how this location changes with walking speed, helps in better understanding the circumstances when MTC is most relevant. This study helps define where MTC occurs for the swing-phase foot in relation to the stance-phase foot. Gait speed was assessed also to determine its effect on this relative positioning. 3D lower body gait data were collected from 14 barefoot participants (age: 8-14 y). Participants ambulated at slow, self-selected, and fast gait speeds. At all speeds, MTC was found to occur closer to the tip of the hallux rather than to the heel of the stance-phase foot. At slow gait speeds, the MTC was 70.2% from the heel. For the self-selected and fast speeds, the MTC was 113.6% and 98.8% from the heel, respectively. Though the location changed, the vertical height of the swing-phase foot at MTC did not change significantly as a function of gait speed. These results indicate that the location of MTC is significantly impacted by the placement of the stance-phase foot as well as walking speed. These factors can play a role in assessing the risk of tripping when an unexpected trip hazard is present.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"212-218"},"PeriodicalIF":1.6,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147470234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Effect of the Lateral Wedge Insoles on Cumulative Loads and Changes in Physical Activity of Patients With Knee Osteoarthritis.","authors":"Chen Xu, Yosuke Ishii, Goki Kamei, Akinori Nekomoto, Takato Hashizume, Saeko Okamoto, Riko Okinaka, Kexin Zhu, Yoshitaka Iwamoto, Yuko Nakashima, Masakazu Ishikawa, Makoto Takahashi, Nobuo Adachi","doi":"10.1123/jab.2024-0152","DOIUrl":"10.1123/jab.2024-0152","url":null,"abstract":"<p><p>Knee pain in patients with knee osteoarthritis leads to decreased physical activity. The knee adduction moment impulse is closely related to pain, multiplied by the number of steps per day, reflecting the cumulative knee adductor load (CKAL). The intervention of lateral wedge insole (LWI) can relieve pain by reducing the CKAL, but changes in physical activity have not been investigated. This study aimed to determine the effect of the LWI on the CKAL and changes in physical activity. Twenty-one patients with knee osteoarthritis were enrolled in our study. The knee adduction moment impulse was estimated by a VICON system without LWI (baseline) and with LWI immediately (T0) at the initial visit and 3 months after intervention (T1). An accelerometer was worn for 8 days to monitor daily steps and activity. The physical activity was performed at baseline and T1. Pain was evaluated at baseline, T0, and T1. Pain and CKAL were reduced significantly after the intervention of the LWI. The knee adduction moment impulse at T0 and T1 was reduced compared with the baseline. There was no significant change in daily steps. However, physical activity significantly decreased in terms of the total duration of activity, standing, and periods of standing and walking.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"240-245"},"PeriodicalIF":1.6,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147470301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Individuals With Knee Osteoarthritis and Symmetrical Total Joint Moment Exhibit Bilateral Gait Characteristics Associated With Osteoarthritis.","authors":"Carson Halliwell, Aleksandra Budarick, Janie Astephen Wilson, Derek Rutherford, Meaghan Hannigan, Rebecca Moyer","doi":"10.1123/jab.2025-0183","DOIUrl":"10.1123/jab.2025-0183","url":null,"abstract":"<p><p>Interlimb asymmetries may influence contralateral knee osteoarthritis (OA) progression, yet research remains unclear. This study examined whether patient-reported outcomes and knee biomechanics differ between individuals with knee OA exhibiting symmetrical versus asymmetrical knee loading. Forty-three individuals with knee OA were dichotomized into symmetrical (≤14% asymmetry; n = 19) and asymmetrical (>14% asymmetry; n = 24) groups based on total joint moment symmetry indices. Participants completed the Knee Injury and Osteoarthritis Outcome Score and Intermittent and Constant Osteoarthritis Pain questionnaires. Three-dimensional kinematics and kinetics were collected during walking at a self-selected speed. Independent t tests and statistical parametric mapping examined between-group differences in patient-reported outcomes and biomechanical measures. Individuals with symmetrical knee loading had worse Knee Injury and Osteoarthritis Outcome Score activities of daily living scores (P = .041) than those with asymmetrical loading. Individuals with symmetrical knee loading exhibited less knee extension moment during late stance (P = .031) and lower knee adduction moment range in their affected knee compared with asymmetrical loaders. Individuals with symmetrical knee loading walked with lower knee flexion angles (P = .011), less midstance unloading (P = .011), and lower peak knee flexion moment (P < .001) in their contralateral knee compared with asymmetrical loaders. Symmetrical knee loading was associated with affected and contralateral knee biomechanics that were consistent with more severe knee OA and worse functional outcomes.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"204-211"},"PeriodicalIF":1.6,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147328234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jungsun Moon, Dustin F Tran, Jordyn R Lopez, Matthew M Hanks
{"title":"Comparison of 3-Dimensional Thorax and Upper-Extremity Joint Kinematics During Manual Wheelchair Propulsion Using Marker-Based and Markerless-Based Biomechanical Models.","authors":"Jungsun Moon, Dustin F Tran, Jordyn R Lopez, Matthew M Hanks","doi":"10.1123/jab.2025-0104","DOIUrl":"10.1123/jab.2025-0104","url":null,"abstract":"<p><p>Marker-based motion analysis is the standard for evaluating human movement, yet it is time-intensive and requires extensive technical knowledge. Markerless-based motion analysis can simplify and expedite clinical biomechanics research, but its utility with unique populations, like manual wheelchair users, remains understudied. The purpose of this study was to compare 3-dimensional thorax and bilateral upper-extremity joint kinematics during manual wheelchair propulsion between criterion-standard marker-based and novel markerless-based biomechanical models. Fifteen young adult, manual wheelchair users propelled on a stationary roller while synchronized optical motion analysis cameras recorded 3-dimensional marker trajectory and 2-dimensional video data simultaneously. Statistical parametric mapping was used to evaluate kinematic differences between models. Pearson correlation and average root mean square were also used to explore the relationships and the magnitudes of observed differences between models. Significant differences in thorax and upper-extremity joint kinematics were observed between the models (P < .05). Joint angle differences varied in magnitude from 3.6° to 36.6° and joint center differences varied in magnitude from 0.4 to 2.4 cm. Differences were dependent upon the joint and anatomical plane/axis. Despite some observed limitations, markerless-based motion analysis may be a useful clinical research tool to evaluate thorax and upper-extremity kinematics during wheelchair mobility.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"192-203"},"PeriodicalIF":1.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147328192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rafael F Escamilla, Jonathan S Slowik, Rodney Imamura, Irwin S Thompson, Robert Asuncion, Arnel L Aguinaldo, Glenn S Fleisig
{"title":"Do Pitching Biomechanics Differ Between Windup and Stretch Pitching Deliveries From a Dirt Surface Mound in College Baseball Pitchers?","authors":"Rafael F Escamilla, Jonathan S Slowik, Rodney Imamura, Irwin S Thompson, Robert Asuncion, Arnel L Aguinaldo, Glenn S Fleisig","doi":"10.1123/jab.2025-0278","DOIUrl":"10.1123/jab.2025-0278","url":null,"abstract":"<p><p>It is unknown how pitching biomechanics in college baseball pitchers differ between windup and stretch pitching deliveries from a dirt surface mound. The purpose was to assess differences in shoulder and elbow kinetics and pitching kinematics in college pitchers between windup and stretch pitching deliveries from a dirt surface mound. Eighteen college pitchers pitched from a dirt surface mound using windup and stretch pitching deliveries. All pitchers were tested using a 240-Hz, 12-camera motion analysis system, and 28 kinematic and 7 kinetic parameters were calculated. Paired within-subjects t tests (P < .05) were used to assess biomechanical differences between windup and stretch deliveries. Maximum shoulder horizontal adduction torque, maximum shoulder anterior force, maximum lead knee height, ball velocity at ball release, forward trunk tilt at ball release, maximum upper trunk angular velocity, maximum elbow extension angular velocity, and maximum shoulder internal rotation angular velocity were all significantly greater using a windup delivery compared with a stretch delivery. Pelvic drift at maximum lead knee height was the only parameter that was significantly greater in a stretch delivery compared with a windup delivery. Nine of the 35 (26%) biomechanical parameters were significantly different between windup and stretch deliveries. Shoulder injury risk may be slightly lower using a stretch delivery compared with a windup delivery due to overall lower shoulder kinetics during the stretch delivery.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"165-172"},"PeriodicalIF":1.6,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146776954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Greater Ankle Plantar Flexor Work Is Predictive of Better Running Economy on Steep Uphill Grades.","authors":"Rachel M Robinson, Michael E Hahn","doi":"10.1123/jab.2025-0250","DOIUrl":"10.1123/jab.2025-0250","url":null,"abstract":"<p><p>The purpose of this study was to determine the influence of lower extremity joint kinetics and muscle strength on running economy (RE) over level ground, 5% and 10% grades. Twenty-seven recreational runners (14 females, age: 33.7 [12.8] y, mass: 70.2 [12.5] kg, height: 175.9 [9.1] cm) completed laboratory-based RE, biomechanics, and isokinetic dynamometry testing. Linear regression analyses were used to determine the effect of lower extremity joint work, stiffness, and strength on RE for each grade. Greater ankle plantar flexor work was predictive of better economy when running on the 10% grade (β = -3054.56; P = .013), but not the level ground or 5% grade (P > .05). No other joint work, stiffness, or strength factors were related to RE. A secondary analysis explored the relationship of training factors to RE, demonstrating better 10% grade RE (P = .015) and greater ankle work (P = .048) in trail runners compared with road runners. The results of this study suggest that targeting the energy generation capacity of the plantar flexors may be worthwhile for improving uphill RE. Trail running may lead to specific physiological and biomechanical adaptations that are beneficial to performance.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"152-160"},"PeriodicalIF":1.6,"publicationDate":"2026-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146229819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manoela Vieira Sousa, Jose Ignacio Priego-Quesada, Klaus M Becker, Pedro Fonseca, Ulysses F Ervilha, João Paulo Vilas-Boas
{"title":"Relationship Between Decomposition of Surface Electromyography Signals and Force Production: Analyzing Recovery From Intense Exercise.","authors":"Manoela Vieira Sousa, Jose Ignacio Priego-Quesada, Klaus M Becker, Pedro Fonseca, Ulysses F Ervilha, João Paulo Vilas-Boas","doi":"10.1123/jab.2024-0141","DOIUrl":"10.1123/jab.2024-0141","url":null,"abstract":"<p><p>This study investigated the relationship between neuromuscular (motor unit action potential amplitude [MUAP], firing rate, recruitment threshold), biomechanical (force loss), physiological (skin temperature), and perceptual (delayed onset of muscle soreness) markers following an intense knee exercise protocol. Eleven participants performed 2 maximal isometric and 5 concentric-eccentric knee contractions. Assessments were made immediately postexercise (0 h), at 24 hours and 48 hours after intense knee exercise protocol. Electromyography signal decomposition and skin temperature were measured during the protocol, while delayed onset of muscle soreness was evaluated at 24 and 48 hours. A reduction in force production (isometric, dynamic, and Work) was observed at all postexercise time points. Delayed onset of muscle soreness increased at 24- and 48-hour postexercise compared to Pre-exercise. At 0 hours, a positive, moderate correlation was observed between dynamic force loss and MUAP of the vastus lateralis (VL). Two moderate positive correlations were observed between firing rate of rectus femoris and minimum temperature, and between the recruitment threshold of VL and mean temperature. At 24-hour postexercise, a positive moderate correlation was observed between dynamic peak torque and MUAP of VL. These findings suggest that full recovery of force is not achieved at 48-hour postexercise, with MUAP of VL playing a key role in muscle recovery.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"173-182"},"PeriodicalIF":1.6,"publicationDate":"2026-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146229898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matthew Ruder, Vincenzo E Di Bacco, Jereme Outerleys, Monica Malek, Elise Laende, Fatima Gafoor, Kim Madden, Anthony Adili, Kevin Deluzio, Dylan Kobsar
{"title":"Evaluating the Agreement of Markerless Motion Capture for Joint Angle Estimation in a Constrained Hallway Setting Compared With a Traditional Laboratory Setting.","authors":"Matthew Ruder, Vincenzo E Di Bacco, Jereme Outerleys, Monica Malek, Elise Laende, Fatima Gafoor, Kim Madden, Anthony Adili, Kevin Deluzio, Dylan Kobsar","doi":"10.1123/jab.2025-0265","DOIUrl":"10.1123/jab.2025-0265","url":null,"abstract":"<p><p>Gait analysis is a valuable approach for understanding human movement, but the space and setup requirements of traditional marker-based systems can limit their use outside specialized laboratories. Markerless motion capture may provide a more flexible option, though its agreement in constrained environments compared with traditional spaces is not well established. This study compared a 10-camera markerless system deployed in a hallway with a traditional 8-camera laboratory setup. Twenty-five healthy adults (15 females, 10 males; age 34 [16] y) completed quiet standing, 60 seconds of self-selected walking, and 5-repetition sit-to-stand tasks at both sites on the same day. Three-dimensional pose estimates were processed to calculate alignment during standing, lower-limb joint kinematics during walking, and trunk flexion during sit-to-stand. Agreement within and between sites was assessed using Pearson correlations, root mean square error, Bland Altman limits of agreement, and intraclass correlation coefficients. Standing and walking outcomes showed excellent agreement (intraclass correlation coefficients ≥ .97; root mean square error < 2.3°; mean differences < 1.1°). Sit-to-stand was more variable (limits of agreement 12°-20°) but remained highly reliable (intraclass correlation coefficients > .96). These findings indicate that a constrained markerless setup can yield kinematic data comparable to a laboratory arrangement, suggesting potential for broader use of markerless approaches in diverse environments.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"183-191"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146183407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Association Between Foot-Ankle Mechanical Leverage and Instability During Walking in Older and Younger Adults.","authors":"Aubrey J Gray, Kota Z Takahashi, Jason R Franz","doi":"10.1123/jab.2025-0054","DOIUrl":"10.1123/jab.2025-0054","url":null,"abstract":"<p><p>Falls in older adults are a serious public health concern with physical and economic consequences that reduce independence and quality of life. Older adults have morphological changes at the foot and ankle that may disrupt foot neuromechanics and the foot's ability to regulate mechanical leverage and balance during walking. This study quantified age and walking speed effects on mechanical leverage of the foot and ankle, as well as the extent to which interindividual differences in foot-ankle leverage correlated with whole-body balance metrics-the latter during habitual walking and in response to 2 contexts of walking balance perturbations. We found no age effect on peak external moment arms due to ground reaction forces. However, older adults exhibited smaller peak ankle moments, larger ranges of frontal plane whole-body angular momentum, larger anterior-posterior margin of stability, and larger perturbation-induced changes in whole-body angular momentum than younger adults. We also report the first evidence that better foot-ankle leverage during habitual walking correlated with larger margins of stability and smaller ranges of whole-body angular momentum. This study was a first step in understanding the relationship between foot-ankle mechanical leverage and whole-body balance.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"140-151"},"PeriodicalIF":1.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146120339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pascal Wischhoff, Marissa M R Riemens, Kenneth Meijer, Ilona J M de Rooij
{"title":"Differences in Treadmill-Based Gait Analysis Based on 3 Methods for Comfortable Walking Speed Selection in Healthy Adults.","authors":"Pascal Wischhoff, Marissa M R Riemens, Kenneth Meijer, Ilona J M de Rooij","doi":"10.1123/jab.2024-0275","DOIUrl":"10.1123/jab.2024-0275","url":null,"abstract":"<p><p>During gait analysis, the walking speed of the individual should reflect the walking speed in everyday life. This study compared spatiotemporal and kinematic parameters between 3 conditions of selecting walking speed for treadmill-based gait analysis in healthy adults. We hypothesized that gait parameters collected during self-selected treadmill walking differ from those collected when walking at matched overground speed and self-paced speed. Forty-two healthy participants (40.0 [12.7] y; 16 males) walked on a treadmill in a virtual environment in 3 conditions: speed matching overground speed from the 10-m walk test, self-paced walking, and speed selected by the participant. Spatiotemporal and kinematic parameters were collected using motion capture analysis. Results showed significant differences in walking speed, step length, stride length, step time, stride time, stance time, cadence, peak extension angle of the hip, and peak plantar flexion angle of the ankle between the self-paced condition and matched overground speed (P < .05). These differences in gait parameters were likely due to variations in speed between the 2 conditions. No significant differences were found between treadmill-selected and matched overground speed or self-paced condition. These findings suggest that letting the participant decide their comfortable walking speed is appropriate for speed selection in gait analysis.</p>","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"115-121"},"PeriodicalIF":1.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146031609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}