lecture 10: biomechanics & gaits of the horse chapter 6
TRANSCRIPT
Lecture 10: Biomechanics & Gaits of the HorseChapter 6
Function is to contract – twitch◦ Neurotransmitter –Acetylcholine (ACh)
Actin & myosin
Due to an accumulation of waste products in cells.
1. CO22. Heat3. Lactic acid4. Decreased energy – glucose – ATP
Abnormality where there is constant contraction and disorientation of function.
Clostridium tetanae
Stride is the distance between successive imprints of the same foot.
Stride stance is the weight bearing phase.
Stride suspension is the non-weight bearing phase.
Normal foot fall
Winging in – toe out/ splay-footed.
Paddling – toe in/ pigeon-toed.
1. Walk – four beat gait – lateral
2. Trot – two beat gait – diagonal
3. Canter – three beat gait – lead with the unpaired fore; also a diagonal
4. Gallop – four beat gait – diagonal breaks into single
Diagonals Two beat Suspension
Three beat One diagonal Suspension Lead
https://www.youtube.com/watch?v=5MAw61kegd8
Four beat No pairs suspension
https://www.youtube.com/watch?v=scZbaTTAbCM&index=2&list=PLmllHxxWPzfyOmu_Y9dUJ7Oge0qifSUNz
Diagonal Trot
Slowly, it will be broken into a walk.
https://www.youtube.com/watch?v=H7C3uqTl98w (with jumping/backing)
https://www.youtube.com/watch?v=aoB6FFP7a84https://www.youtube.com/watch?v=B2jBYugBFvc
http://www.gaitedhorses.net/Articles/Rack/RackingGait.shtml
Two beat Lateral gait Suspension
https://www.youtube.com/watch?v=4dzz_--8Nj4
American Saddlebred Horse
Four beat; almost pace Back land first Lateral No overstep
https://www.youtube.com/watch?v=NmGP0yYw-58 (All 5 gaits SB)https://www.youtube.com/watch?v=QCR_OJyAvcI
Four beat Fast, vertical Lateral One Foot contact No overstride
Four beat Lateral Overstep/overstride Head nod
Four beat diagonal Trot behind Walk front Rolling motion Front first
Four beat Very rapid steps Slow forward speed Very smooth Paso llano, sobreandando Paso Fino, Corto, Largo, (trocha)
https://www.youtube.com/watch?v=4N_KtKEQUmE
5-gaited◦ Tolt◦ Flying Pace
https://www.youtube.com/watch?v=RV9P0w8vZi8
Scalping – toe of the front hits above coronary of back
Cross firing – interference of opposite feet in pacers.
Forging – toe of hind foot strikes sole of forefoot
Overreaching – toe of hind foot strikes front, frequently heel bulb
Brushing – the striding foot strikes the supporting leg.◦ Front with front◦ Hind with hind
Paddling – pigeon-toed.
Winding – plaiting crossing over the front legs.
Pounding – excessive weight coming down onthe foot.