检索结果-南通市图书馆

Open Journal of Veterinary Medicine 2024年第6期14卷 137-154页

作者： adrian harrison Dept for Veterinary and Animal Sciences (IVH) Faculty of Health & Medical Sciences University of Copenhagen PAS Section for Physiology Frederiksberg Denmark

Background: Scientific procedures for addressing noseband fit and tightness, eliminating the risk of excessive and painful tightening, as well as quantitative measurements of pressures under the noseband while riding are either scarce or lacking. Purpose/Aim: To assess simple means of measuring pressure under different nosebands with a view to their adoption as scientific methodology. Method: Horses (n = 7) were fitted with five different bridles (A-E). Pressure distribution and intensity were measured using colour sensitive film (Fujifilm LLLW), assessing the level of pressure and distribution across the surface of the nosebands, as assessed and ranked by independent assessors. A CURO system was also used to measure pressure in real-time under nosebands whilst riding. Results: The colour-sensitive film for D & B were ranked 1st and 2nd, respectively. Regularity of pressure overall showed a statistical difference between nosebands (A & B significantly more unregular than the others). Pressure measurements revealed significantly different means (all P Conclusions: Pressures under nosebands can reach levels that appear capable of inflicting tissue damage, hence bridles and nosebands should be assessed using scientific methodology and not based on arbitrary and subjective criteria, as is currently the case.

关键词： Noseband Welfare Pain Bridle Fit Riding Tölt FEI

The Use of Far Infrared Treatment Prior to Exercise in Horses: An mfBIA and Acoustic Myography Three Case Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Veterinary Medicine 2024年第4期14卷 69-89页

作者： adrian harrison D.Phil Department for Veterinary and Animal Sciences (IVH) Faculty of Health & Medical Sciences University of Copenhagen K&#248benhavn Denmark

Background: Acute effects of Far Infrared (FIR) treatment in horses are unknown, especially short periods of 30 minutes, as is any effect on such muscle parameters as warm-up balance, overall exercise balance and laterality asymmetries. Aim: This study examines three equine cases in detail to measure any effects of a short period of FIR treatment. Methods: Multi-frequency bioimpedance (mfBIA) and acoustic myography (AMG), non-invasive techniques, were applied pre- and post-treatment with FIR to the back (T5-L4/5) and for *** dorsi and *** medius was recorded during a 15-minute warm-up regimen. mfBIA parameters included extracellular resistance (Re), centre frequency (fc), membrane capacitance (Mc), intracellular resistance (Ri) and phase angle (PA) which indicates level of training and health status. Results: FIR treatment responses for mfBIA parameters were found to be horse-specific and different, whilst in terms of AMG, FIR treatment for 30 minutes had a beneficial effect on overall balance in all three horses (5 out of 6 muscles), and a beneficial effect on the AMG parameter ST (force symmetry) in all three horses (6 out of 6 muscles). An overall improvement for combined balance and ST values for both muscles and all three horses of 86% was noted with FIR treatment, compared to 56% without. Conclusions: This preliminary study of FIR treatment in three horses, has been found to result in an overall improvement in combined balance and ST values for both muscles. FIR has potential as a promising treatment to reduce the risk of warm-up-related injuries in athletic horses.

关键词： Equine FIR Muscle Balance Muscle Force Injury Prevention

The Effects of Using a Specially Designed Stirrup on Kinetic Energy Absorption by the Knee Joint of 12 Show Jumping/Eventing Riders

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Veterinary Medicine 2023年第2期13卷 13-21页

作者： Marta Kulikowska Franziska C. Wagner adrian harrison Equi Physiq Esrumvej 435 Græsted Denmark Institute of Anatomy Histology and Embryology Faculty of Veterinary Medicine Leipzig University Leipzig Germany Faculty of Health & Medical Sciences Dept for Veterinary and Animal Sciences (IVH) Section for Physiology University of Copenhagen PAS Frederiksberg Denmark

The use of Winderen Knee Protection Solution stirrups compared to standard iron stirrups, reveals the following benefits: 1) A reduction of stress or strain time in the order of 14 seconds per minute of activity whilst walking and 5 - 7 seconds less whilst trotting or cantering for muscles around the knee. 2) A reduction of stress or strain time in the order of 25 seconds per minute of activity whilst walking and 9 - 10 seconds less whilst trotting or cantering for ligaments around the knee. 3) A significant improvement in the E-score (less time exposed to stress and shock) and ST-score (lower force around the knee) whilst walking. 4) A considerable improvement in rider comfort and feeling of leg stability (self-assessment) compared with the owners current stirrups, whilst riding.

关键词： Stirrups Knee Stress Acoustic Myography Riders

Is Deep Time Geology Scientific?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第2期35卷 700-703页

作者： T.Mark harrison Department of Earth Planetary and Space SciencesUniversity of CaliforniaLos Angeles90095USA

We all know what car mechanics *** maintain and repair our automobiles according to established engineering *** all know what physicians *** maintain and repair our bodies according to established medical *** what is it that I do as a scientist?Indeed,am I a scientist?The answer to these questions depends on what we meant by“science”.

关键词： maintain Deep repair

Forward robust portfolio selection: The binomial case

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Probability, Uncertainty and Quantitative Risk 2024年第1期9卷 107-122页

作者： harrison Waldon Oaford-Man Institute of Quantitative Finance University of OafordEagle House Walton Well RoadOrfordOX26EDUK

We introduce a new approach for optimal portfolio choice under model ambiguity by incorporating predictable forward preferences in the framework of Angoshtari et al.[2].The investor reassesses and revises the model ambiguity set incrementally in time while,also,updating his risk preferences forward in *** dynamic alignment of preferences and ambiguity updating results in time-consistent policies and provides a richer,more accurate learning *** each investment period,the investor solves a worst-case portfolio optimization over possible market models,which are represented via a Wasserstein neighborhood centered at a binomial *** methods from Gao and Kleywegt[10];Blanchet and Murthy[8]are used to solve the optimization problem over a suitable set of measures,yielding an explicit optimal portfolio in the linear *** analyze the case of linear and quadratic utilities,and provide numerical results.

关键词： Forward robust portfolio selection Binomial case Optimal portfolio Forward performance processes Linear utilities Quadratic utilities Robust forward performance criteria

Acoustic Myography: Its Assessment of Ground Reaction Forces as Measured through Forelimb and Hind Limb of the Horse during Mild Exercise

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Veterinary Medicine 2022年第10期12卷 101-115页

作者： Diane Isbell Sebastian Laguna Jillian Costello Chavers Waqas Ahmed Vibeke Sødring Elbrønd Robert Bowker adrian harrison Equine Vet Practice Livermore USA University of La Salle Veterinary Sciences Bogota Colombia Magnolia Sport Horse Equine Lameness and Imaging PLLC Ocala USA Biomechanics & Rehabilitation Section for Pathobiological Sciences Dept for Veterinary and Animal Sciences (IVH) Faculty of Health & Medical Sciences University of Copenhagen Frederiksberg Denmark East Lansing MI & Corona Vista Equine Center Michigan State University East Lansing USA

Background: Fractures in the limbs of racehorses are common, resulting among other factors, as the result of repeated ground reaction forces on bones and joints, leading to catastrophic failure. Aim: To quantify ground impact transmission through the limb bones of un-shod healthy horses using the non-invasive technique of acoustic myography (AMG). Methods: Four sites were selected for AMG measurements at the walk and trot, hoof wall (site 1) and sites 2 - 4, metacarpal 3, carpals and the radius of the left forelimb of two healthy horses. Measurements were on both rubber and concrete. AMG of the equine hind limb suspensory system was made and analyzed (amplitude and timing) for the proximal suspensory ligament (PSL) and the SDFT/DDFT. Results: AMG signal amplitude at site 1 (1.5 ± 0.2 versus 1.1 ± 1.5) was not found to be significantly different at the trot compared to the walk;however, sites 2, 3 and 4 were all significantly different when compared between the two gaits;site 2 P = 0.008;site 3 P = 0.006;site 4 P = 0.005. AMG signals recorded on the rubber surface had smaller amplitude than the equivalent signal and site on the concrete surface. Ground Reaction Force (GRF) transmission in the equine forelimb was 22 m/sec, whilst that of the hind limb suspensory system was 25 m/sec. Conclusion: Findings indicate that GRFs are transmitted proximally along the limb at considerable speeds, that they are dampened by tissues and structures in the limb, and that the GRFs are present and detectable proximal to the fetlock joint.

关键词： Horse Foot Limb Acoustic Myography Suspensory System

Anon-Invasive Assessment of Ground Reaction Forces in the Human Leg in Response to Walking, Jogging, Running and Jumping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Orthopedics 2020年第7期10卷 152-160页

作者： Jessica Pingel adrian harrison Department of Neuroscience Faculty of Health & Medical Sciences University of Copenhagen K&oslash benhavn Denmark PAS Department of Physiology Faculty of Health & Medical Sciences University of Copenhagen Frederiksberg Denmark

Running is one of the most popular forms of exercise. Even though regular exercise is beneficial to human health, running is also often associated with an increased risk of injury. Lack of shock absorption in running shoes has often been stated as one of the main reasons for why running-related injuries have been on the increase. The aim of the present study was to assess the degree to which ground reaction forces (GRF) can be dissipated in the human leg in a barefoot subject, in connection with diverse physical activities. Acoustic myography (AMG), a non-invasive technique that records pressure waves from contracting muscles as well as the harmonic damping of ligaments, was applied to four anatomical sites on the subject’s leg, during barefoot walking, jogging, running and jumping. The data for walking on a hard surface show much lower ESTiTM parameters than those for the soft surface, and these lower values are observed mainly for sites 1 (toes;65%) and 2 (ankle;53%), respectively. AMG parameters for jogging reveal this gait to have very low ESTiTM parameters for site 1 and site 2 (ESTi 2 - 3), yet similar for both surfaces. The data for running on a hard and soft surface revealed much lower ESTiTM parameters (38%) than those for sites 3 (knee) and 4 (hip). The data from the big jump, reveal that on a hard surface, the lowest ESTiTM parameters were for sites 1 (toes;46%) and 2 (ankle;27%), compared to values on a soft surface. The speed with which GRFs were transmitted up the leg varied from site to site and also with the type of activity, ranging from undetectable to approx. 60 m/sec. The present study reveals that the ankle joint is exposed to the greatest forces during jumping and running. In addition, this study has confirmed that exercising on a hard surface does indeed increase the stress forces on the toes and ankles. It is interesting to note that the data reveal that toes and ankles absorb most of the GRF during

关键词： Muscle Activity Acoustic Myography

Contracture Development in Whales

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Marine Science 2020年第3期10卷 173-176页

作者： Jessica Pingel adrian harrison Department of Neuroscience Faculty of Health & Medical Sciences University of Copenhagen Frederiksberg C Denmark PAS Physiology Faculty of Health & Medical Sciences University of Copenhagen Frederiksberg C Denmark

It is well known that whales in captivity suffer from dorsal fin bending. However, the mechanisms behind this change are poorly understood. Humans can suffer from similar symptoms either after a period of immobilization or after suffering a brain lesion. Therefore, we here speculate whether the bent dorsal fins are reflecting contracture development in whales.

关键词： Dorsal Fin Cetaceans Contracture Immobilization CNS Lesion

The Effect of Aromatherapy on Equine Facial Expression, Heart Rate, Respiratory Tidal Volume and Spontaneous Muscle Contractures in M. Temporalis and M. Cleidomastoideus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Veterinary Medicine 2021年第2期11卷 87-103页

作者： Sofja Kosiara adrian Paul harrison PAS (Physiology) Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark

The ability to calm horses affects both the safety and well-being of human-horse relationships. However, not many natural calmatives are known, nor the efficacy of these in supporting a state of calmness in horses. This study used both qualitative and quantitative methods to test whether aromatherapy has a measurable and calming effect on equine facial expression and a range of physiological parameters. Nine horses of different ages, genders and breeds were included in a crossover design with humidified essential oils to determine the calming effect of vetiver (Vetiveria zizanioides), spikenard (Nardostachys jatamansi) and roman chamomile (Anthemis nobilis) in relation to water (negative control) and lavender oil (positive control) in horses standing still. The results revealed significantly lowered heart rate (P < 0.05 - <0.001) and respiratory tidal volume (P < 0.05 - <0.001) for the tested essential oils, while spikenard oil was best at inducing a relaxed facial expression (60% of the full-time scale for 8 horses;75% of the full-time scale for 7 horses) and roman chamomile oil was statistically most successful at reducing the incidence of spontaneous muscle contractures in M. Temporalis (P < 0.001) and M. Cleidomastoideus (P < 0.05) compared to the other aromatherapy treatments. It is concluded that aromatherapy has both qualitative and quantitative effects on physiological parameters in static horses, and moreover, that essential oils appear to have a calming effect.

关键词： Horse Essential Oil Calmative Behaviour Welfare

A Static Bioimpedance and Dynamic Acoustic Myography Preliminary Assessment of Low Frequency Therapeutic Ultrasound Treatment of the Shoulder Muscle Trapezius: An Equine Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Veterinary Medicine 2021年第4期11卷 125-135页

作者： Diane lsbell Sebastian Laguna adrian harrison Equine Vet Practice Livermore CA USA University of La Salle Veterinary Sciences Bogota Colombia Biomechanics & Rehabilitation Section for Pathobiological Sciences Faculty of Health & Medical Sciences Copenhagen Uni-versity Copenhagen Denmark

Background: In horses, therapeutic ultrasound has been shown to be beneficial for suspensory ligament injuries, and more generally to stimulate tissue repair and reduce localized pain. However, it has yet to be examined in relation to soft tissue injuries sustained during competition or in connection with rider/saddle interactions. Aim: The aim of the present study was to examine the efficacy of topical low-frequency therapeutic ultrasound on the shoulder muscles of injured horses. Methods: Muscle mass and cellular health was assessed for M. trapezius using non-invasive multi-frequency bioimpedance, and dynamic improvements in M. trapezius and M. latissimus dorsi were examined using acoustic myography (AMG). A total of 8 injured horses (painful to palpation and atrophied) were treated using an EQ Pro Therapy unit, following a set protocol that comprised treatment every other day for 10 treatments. Pre-treatment values were then compared with post-treatment measurements (1 & 6 months later). Results: The mfBIA results for M. trapezius showed a significant improvement (P 0.05) of EQ Pro Therapy treatment for the membrane capacitance (Mc) and phase angle (PA) parameters when comparing the Pre vs Post 1 and Post

关键词： Horse Skeletal Muscle Acoustic Myography Low Frequency Ultrasound