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| 2. |
- Egenvall, Agneta, et al.
(författare)
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Maximum and minimum peaks in rein tension within canter strides
- 2016
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Ingår i: Journal of Veterinary Behavior: Clinical Applications and Research. - : Elsevier BV. - 1558-7878 .- 1878-7517. ; 13, s. 63-71
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Tidskriftsartikel (refereegranskat)abstract
- Equestrians use reins to communicate with the horse. The aim of this study was to describe the amplitudes of rein tension oscillations at canter. Rein tension data were collected from 8 professional riders each riding 2-3 horses during a normal dressage training session using rein tension meters (128 Hz, logged by an inertial measurement unit sensor). Data were stride-split at the maximal positive vertical poll acceleration. Strides were categorized by canter lead, rider position (sitting/2 point), corners, circles, lateral movements, and stride length (collected/working/lengthened). Changes in head angle were determined from gyroscopic sensor data. Dependent data extracted from each stride and rein were maximal tension (MAX), minimal tension (MIN), and the absolute difference between them (CHANGE). Square-root transformed data were analyzed using mixed models with stride categorizations as fixed effects, and rider and horse included as random effects. Findings for rein tension were considered borderline if 0.050.001, but significant if P < 0.001. For the rider's position, the magnitudes were higher in sitting canter than 2-point seat (P < 0.0001), except for inside rein MIN value (n = 21,548 strides). For MAX (both reins), MIN (inside), and CHANGE (outside), the right circle had lower values than the left circle or no circle. For the outside rein, MAX and MIN values showed borderline differences with higher values for lengthened strides than working canter (P = 0.03/0.0014). Inside rein values in right half pass were significantly or borderline higher than left half pass or baseline, and for MIN values, this was found for both inside/outside reins. Both group effects and all pairwise comparisons evaluated were significant for MAX and CHANGE, except the comparison between inside and outside rein in right canter. MAX/MIN tensions were higher if the nose was moving caudally relative to poll at the MAX/MIN event, respectively. Young horses had the largest MAX and CHANGE values, whereas advanced horses had the highest MIN values. The horse contributed 7%, 27%, and 29% of the variation to MIN, MAX, and CHANGE models, respectively. The rider contributed 19% of the variation to the MIN value models but 0% to the MAX and CHANGE models, suggesting that the horse or the dyad (not statistically separable) is responsible for the basic rein tension pattern at canter. Overall results indicate that asymmetry, of riders and/or horses, plays a role in rein tension. (c) 2016 Elsevier Inc. All rights reserved.
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- Egenvall, Agneta, et al.
(författare)
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Modelling rein tension during riding sessions using the generalised additive modelling technique
- 2018
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Ingår i: Comparative Exercise Physiology. - 1755-2540 .- 1755-2559. ; 14, s. 209-221
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Tidskriftsartikel (refereegranskat)abstract
- General additive modelling (GAM-modelling) is an exploratory technique that can be used on longitudinal (time series) data, e.g. rein tension, over a period of time. The aim was to apply GAM-modelling to investigate changes in rein tension during a normal flatwork training session. Six riders each rode two or three of their horses (n=17 horses) during a normal flatwork/dressage training session with video recordings and rein tension measurements (128 Hz). Training sessions were classified according to rider position, stride length and whether horses were straight, bent to the left or bent to the right. The rein tension data were split into strides and for each stride minimal (MIN) and maximal (MAX) rein tension were determined and the area under the rein tension curve (AUC) was calculated. Using data on a contact the three outcome variables MIN, MAX and AUC rein tension were modelled by horse and rein (left/right), and time within the session was modelled as a smooth function. Two additional sets of models were constructed; one set using data within-rein with gait as a fixed effect and one set with rein and gait as fixed effects. Mean ± standard deviation values were MIN: 8.0±7.7 N, AUC: 180±109 Ns, and MAX: 49±31 N. GAM-modelling extracted visually interpretable information from the originally chaotic rein tension signals. Modelled data suggest that MIN, AUC and MAX follow the same pattern within horse. In general, rein tension was lowest in walk, intermediate in trot and highest in canter. Evaluating the entire ride, 12/17 horses systematically showed higher tension in the right rein. It is concluded that GAM-models may be useful for detecting patterns through time in biomechanical data.
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| 4. |
- Egenvall, Agneta, et al.
(författare)
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Rein tension during canter
- 2015
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Ingår i: Comparative Exercise Physiology. - 1755-2540 .- 1755-2559. ; 11, s. 107-117
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Tidskriftsartikel (refereegranskat)abstract
- Riders generally use reins as a means for communication with the horse. At present, the signalling pattern is poorly understood. The aim of this study was to illustrate and analyse the rein tension patterns in a number of rider/horse combinations across a variety of exercises in the canter gait. Our hypothesis was that some riders will follow the movement of the horse more closely than others. Data were collected from eight professional riders riding each three (in one case two) horses that were familiar to them in canter. Horses were instrumented with rein tension meters logged by inertial measurement unit technique (IMU). Inside and outside rein tension data were synchronised with the gait using the vertical acceleration IMU-signal at the poll. Stride-split data (0-100 percentages) were analysed using mixed models technique to elucidate the inside/outside and stride percentage interaction, taking into account the exercises performed. In general, tension was maximal just before the beginning of vertical stance, as defined by the maximal acceleration of the head, with the release closer to the suspension phase. The release was significantly more marked on the outside rein, but between riders and horses the pattern varied substantially. In total 26% of the variation was represented by riders and 21% by the horses. On average there were significant inside/outside rein differences, but at the same time in some horse/rider combinations these differences did not exist.
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| 5. |
- Egenvall, Agneta, et al.
(författare)
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Rein Tension During Transitions
- 2016
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Ingår i: Equine Veterinary Journal. - : Wiley. - 0425-1644 .- 2042-3306. ; 48, s. 26-26
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 6. |
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| 7. |
- Egenvall, Agneta, et al.
(författare)
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Stride-related rein tension patterns in walk and trot in the ridden horse
- 2015
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Ingår i: Acta Veterinaria Scandinavica. - : Springer Science and Business Media LLC. - 0044-605X .- 1751-0147. ; 57
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Tidskriftsartikel (refereegranskat)abstract
- Background: The use of tack (equipment such as saddles and reins) and especially of bits because of rein tension resulting in pressure in the mouth is questioned because of welfare concerns. We hypothesised that rein tension patterns in walk and trot reflect general gait kinematics, but are also determined by individual horse and rider effects. Six professional riders rode three familiar horses in walk and trot. Horses were equipped with rein tension meters logged by inertial measurement unit technique. Left and right rein tension data were synchronized with the gait.Results: Stride split data (0-100 %) were analysed using mixed models technique to elucidate the left/right rein and stride percentage interaction, in relation to the exercises performed. In walk, rein tension was highest at hindlimb stance. Rein tension was highest in the suspension phase at trot, and lowest during the stance phase. In rising trot there was a significant difference between the two midstance phases, but not in sitting trot. When turning in trot there was a significant statistical association with the gait pattern with the tension being highest in the inside rein when the horse was on the outer fore-inner hindlimb diagonal.Conclusions: Substantial between-rider variation was demonstrated in walk and trot and between-horse variation in walk. Biphasic rein tensions patterns during the stride were found mainly in trot.
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| 8. |
- Eisersiö, Marie, et al.
(författare)
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A snapshot of the training schedule for 8 professional riders riding dressage
- 2015
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Ingår i: Comparative Exercise Physiology. - 1755-2540 .- 1755-2559. ; 11, s. 35-46
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to document and categorise riding sessions, carried out by professional riders, by describing the riding sessions according to gait, ridden track, lateral movements, rider position in the saddle and rein length. These data were then analysed relative to horse and rider characteristics, e.g. educational level of horse and rider, time in training and laterality of the horse. Eight professional riders riding 3 familiar horses each participated in the study and the riders were asked to demonstrate their normal routine for flatwork/dressage with each horse. The whole training session was video recorded. Video recordings were scrutinised and data were categorised and analysed. Mixed models were used for the statistical analysis, including rider as random effect. The median length of the riding sessions were 31 min. The riders spent 38% of the riding session at the walk, 39% at the trot, 8% at left lead canter and 9% at the right lead canter. The riders devoted 28-29% of the riding session to riding straight, turning left and turning right and 8% to riding lateral movements. The ridden exercises performed and the duration of the exercises was to a large extent connected to the educational level of the horse and its time in training with the rider. More work at the canter and lateral movements at the trot were included for upper level horses compared to lower level horses. Horses in training for more than one year, compared to less than one year, were ridden for longer durations at the canter and shorter durations at the trot. The disposition of riding sessions needs further investigation. In particular, large scale epidemiological studies of orthopaedic injuries need to consider the daily riding sessions in detail.
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| 9. |
- Eisersiö, Marie, et al.
(författare)
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Rein tension in 8 professional riders during regular training sessions
- 2015
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Ingår i: Journal of Veterinary Behavior: Clinical Applications and Research. - : Elsevier BV. - 1558-7878 .- 1878-7517. ; 10, s. 419-426
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Tidskriftsartikel (refereegranskat)abstract
- Rein tension signals are commonly used to communicate the intended speed, direction, and head carriage to the horse during horseback riding. Rein tension has previously been recorded relative to gait, exercises, and turning maneuvers. The aim of this study was to target the between-gait and between-exercise variation in rein tension, controlling for riders and horses within riders, the between-rein variation, and the general within-gait or exercise variation, during entire riding sessions. Eight riders with 3 horses each were included in the study and each horse was fitted with a custom-made rein tension meter fastened on leather reins. Rein tension data and video films were collected during the riding session, and the video films were scrutinized and categorized according to ridden exercises. Statistics used to model rein tension in mixed models were "median", area under curve, averages of 2 and 25 percentiles ("low") and of 75 and 98 percentiles ("high"), and the difference between 98 and 2 percentiles ("range"). Fixed effects were rein, gait, rider's position, horse level, and type of ridden exercise, and random effects were horse-side, rider, horse, and trial within horse. The analyses demonstrate substantial variation between gaits, rider position within gait, and between riders and horses. Considering data on short reins, the major determinants found for amount of rein tension was gait (walk [median 12 N both reins] < trot [median 14-19 N left/right rein and sitting/posting] < canter [median 1324 N left/right rein and sitting/light seat]) as well as the rider's position in the saddle for trot (posting [median 14 N both reins] < sitting [median 17 N/19 N left/right rein]) and canter (light seat [median 1317 N left/right rein and left/right canter] < sitting [median 20-24 N left/right rein and left/right canter]). Regarding the 2 reins; the right rein was the highest in comparisons in the "high" and "range" models, whereas the inside rein was the highest in canter. Riders contributed to most of the variation in the "median" and "low" models, whereas horses contributed the highest relative variance estimates in the models associated with high rein tension ("high" and "range"). Our results suggest that variables to consider in rein tension studies are the gait of travel, the rider's position in the saddle, the ridden exercise performed, the educational level of horse, the rider and horse per se, and to some extent the left or right rein. (C) 2015 The Authors. Published by Elsevier Inc.
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| 10. |
- Hammarberg, Marie, et al.
(författare)
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Rater agreement of visual lameness assessment in horses during lungeing
- 2016
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Ingår i: Equine Veterinary Journal. - : Wiley. - 0425-1644 .- 2042-3306. ; 48, s. 78-82
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Tidskriftsartikel (refereegranskat)abstract
- Reasons for performing study Lungeing is an important part of lameness examinations as the circular path may accentuate low-grade lameness. Movement asymmetries related to the circular path, to compensatory movements and to pain make the lameness evaluation complex. Scientific studies have shown high inter-rater variation when assessing lameness during straight line movement. Objectives The aim was to estimate inter- and intra-rater agreement of equine veterinarians evaluating lameness from videos of sound and lame horses during lungeing and to investigate the influence of veterinarians' experience and the objective degree of movement asymmetry on rater agreement. Study design Cross-sectional observational study. Methods Video recordings and quantitative gait analysis with inertial sensors were performed in 23 riding horses of various breeds. The horses were examined at trot on a straight line and during lungeing on soft or hard surfaces in both directions. One video sequence was recorded per condition and the horses were classified as forelimb lame, hindlimb lame or sound from objective straight line symmetry measurements. Equine veterinarians (n = 86), including 43 with >5 years of orthopaedic experience, participated in a web-based survey and were asked to identify the lamest limb on 60 videos, including 10 repeats. The agreements between (inter-rater) and within (intra-rater) veterinarians were analysed with statistics (Fleiss, Cohen). Results Inter-rater agreement was 0.31 (0.38/0.25 for experienced/less experienced) and higher for forelimb (0.33) than for hindlimb lameness (0.11) or soundness (0.08) evaluation. Median intra-rater agreement was 0.57. Conclusions Inter-rater agreement was poor for less experienced raters, and for all raters when evaluating hindlimb lameness. Since identification of the lame limb/limbs is a prerequisite for successful diagnosis, treatment and recovery, the high inter-rater variation when evaluating lameness on the lunge is likely to influence the accuracy and repeatability of lameness examinations and, indirectly, the efficacy of treatment.
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