Category Archives: competition

Biomechanics – The Balance and Reflex Relationship

Emma Dressage 049The horse’s head is the heaviest part of the body. It’s centre of gravity is not situated halfway between the nose and the tail, but just behind the withers.

In a natural position, the horse carries 60% of its weight on the forehand and 40% on its hind legs. Because the muscles over the hind quarters are big and strong, we need to educate the horse to be able to carry more weight on these muscles. This will result in the horse carrying 40% on the forehand and 60% on the hind quarters.

The nerves through which we communicate with the horse are situated in the skin. These send messages to the brain via the spinal cord and back to the muscles, causing contraction of the relevant muscles. This nervous impulse is called a reflex, which causes a quicker reaction in the muscle. There are two types of reflex – natural reflex (fright, flight and moving away), and conditioned reflex (trained reflex). We use the natural reflexes to bring about reactions that enable us to teach the horse to respond in a certain way, becoming a conditioned reflex.

The elevation of the neck causes a reflex reaction to the positioning of the hind leg, while the flexion at the poll causes a parallel reflex reaction to the flexion of the hock and stifle. The back muscles are also involved in the active role of the hind legs. A tight back leads to a stiff hind leg and high croup so the hind leg doesn’t come as far forward under the horses centre of gravity. The flexor muscles in the hind quarters are weaker than the extensors, which provide the propulsion and control the flexion of the hind limb when the leg is loaded. The hind quarters, assisted by the abdominal muscles, cause the loin to round, allowing the hind leg to come further forward under the body.

There are 4 types of reflex relationships between the head, neck and hind quarters :

  1. Neck down and nose out – hind leg out behind with an extended hock and stifle. Similar to how a race horse stretches out in a race.Race horse blog
  2. Neck down and poll flexed – commonly seen when the horse is ridden ‘long and low’. The hind leg is out behind but with hock and stifle flexing.horses-600212_1280
  3. Neck elevated and nose forward – hind leg drawn forward under the body but with relatively extended or straight hock and stifle joints.ride-201702_1280
  4. Neck elevated and poll flexed – seen in advanced schooling and highly collected work. The hind leg engaged with flexed hock and stifle.ride-201699_1280

The ‘effect of the aids’ is the result of a positive response, brought about through education and training. The ‘engagement of the hind leg’ is the effect of a positive response to the riders leg aid, causing the hind leg to step forward and under the body. This is also the reason why dressage test sheets include marks for the rider on ‘effectiveness of the aids’, ‘position and seat of the rider’ and ‘correct application of the aids’.

Timing is everything!

What are we really communicating to our horse?

horse to waterIf we watch horses in the wild, or just in a group turned out in a field together, how do they communicate their feelings to one another? Those who have a close relationship will nuzzle and groom each other. Some might put ears back or shove the other to move them out-of-the-way. Only if there is conflict does the ‘touch’ between two horses get hard or brutal even.

When we first start to train our horses, we give praise by either voice or a gentle pat. Even the great horse whisperer Monty Roberts says to ‘give your horse a gentle rub on the horse’s head as a reward.’ But why is it that in competition, the excitement of a great test or jumping round do we see some horses being slapped quite hard across the neck or even hit on the head?

Seeing the expression of shock on the horses face (even fear in some) makes me ask myself ‘What does that communicate to the horse?’ It must be confusing for a horse to jump to the best of its ability, and although sensing the riders pleasure with the effort, is subsequently hit around the head.

A horse can take firm pressure and quite enjoy it in the form of a massage or physiotherapy. But even when doing a massage we build up the pressure slowly, starting with long gentle strokes to relax the horse and the muscles. We don’t dive straight in with firm pressure, as this just causes tension and discomfort for the horse.

It has certainly made me look at the way I praise my horses. I do still pat them on the base of the neck or shoulder but in a gentle way, sometimes choosing just a long stroke down the neck and a friendly scratch on the withers. When I start off the young horses they are patted all over with a cupped hand (which makes noise but will only send a gentle vibration through the muscle) to help desensitise them. Firm pressure is only used to reprimand unruly behaviour and should be used sparingly but in a sympathetic manner.

Your Thoughts?sonicschool smile 02