Power training typically involves exercises which apply the maximum amount of force as fast as possible; on the basis that strength + speed = power. Jumping with weights or throwing weights are two examples of power training exercises. Regular weight training exercises such as the clean and jerk and power clean may also be considered as being power training exercises due to the explosive speed required to complete the lifts. Power training may also involve contrasting exercises such as heavy lifts and plyometrics, known as complex training, in an attempt to combine the maximal lifting exertions with dynamic movements. This combination of a high strength exercise with a high speed exercise may lead to an increased ability to apply power. Power training frequently specifically utilises two physiological processes which increase in conjunction with one another during exercise. These are deep breathing, which results in increased intra-abdominal pressure; and post-activation potentation, which is the enhanced activation of the nervous system and increased muscle fibre recruitment. Power training programmes may be shaped to increase the trainee’s ability to apply power in general, to meet sports specific criteria, or both.
Specific forms of power trainingEdit
There are various forms of power training which may be used singularly or in combination with one another.
Plyometrics and loaded plyometricsEdit
Plyometric training typically involves jumping exercises; these exercises may begin from the feet only or also involve taking off from the hands such as is found in a plyometric push up. Plyometric may also refer to exercises which involve similar quick movements of the body in a repetitive manner, such as repeatedly throwing a medicine ball in the air, catching it, and throwing it up again and so forth. Usually, an exercise is considered plyometric or not based upon its speed, the rapidity of its repetitions, and the extent to which it utilises the body’s stretch-shortening cycle. This cycle is where a muscle may be considered to alternately lengthen (an eccentric action) and then shorten (a concentric action) in quick succession during a repetition. The performance of repetitive jumps and sprinting both clearly emphasise the stretch shortening cycle.
Loaded plyometrics refers to the addition of a load, or weight, to jumping exercises. Jumping up and down with a trap bar for instance, or with a barbell held over the head. Loaded plyometrics may increase explosive power more so than unloaded plyometrics.
Ballistic training is based upon maximising the acceleration phase of an object and minimising the deceleration phase. This may involve throwing a weight, as the term ballistic implies, but may also involve jumping whilst holding a weight or swinging a weight. Examples include throwing a medicine ball, jumping with a trap bar, or swinging a weighted club.
Complex training, sometimes referred to as contrast training, involves alternating heavy lifts with plyometric exercises. Ideally, the exercises should move through similar ranges of motion. For example, a set of back squats at about 85-95% 1RM followed by a set of vertical jumps. The intention is to utilise the PAP effect from the heavy back squats in the jumping exercises and thereby increase the power with which the jumps are performed with. Over a period of training, this may increase the trainee’s ability to perform the plyometric exercise more powerfully without the preceding heavy lift being required.
Contrast loading involves the alternation of heavy and light loads in weight training exercises. The light lifts should be considerably lighter than the heavy lifts. For example, a bench press exercise at about 85-95% 1RM followed by a set at about 30-60% 1RM. The heavy lifts should be performed fast with the lighter lifts being performed as fast as possible. The joints should not be locked as this inhibits muscle fibre recruitment and reduces the speed at which the exercise can be performed. Weighted jumps or a throwing exercise may take the place of the lighter lifts.
Explosive power liftsEdit
Explosive power lifts are weight training exercises which require a very fast movement to be performed by the lifter in order to lift the weight. For instance, in a power clean, a barbell is quickly lifted from the floor and unto the upper chest; this must be performed fast in one dynamic movement otherwise it would not be possible to move the weight to this position. Similarly, in a clean and jerk, a lifter moves a barbell to a position above their head whilst they quickly lower their height to allow for the easier extension of their arms; this movement must be performed in one very quick fluid action. If the lifter attempted to press the weight above their head slowly then they would not be able to. It is the dramatic increase in speed which allows for the lift to be completed and it is therefore an essential component.
Related physiological processesEdit
Deep breathing and intra-abdominal pressureEdit
During exercise a person breathes deeper in order to meet higher oxygen requirements. This adoption of a deeper breathing pattern also serves a secondary function of strengthening the core of the body. This strengthening effect occurs because the thoracic diaphragm adopts a lower position than it does than when at rest; this generates increased intra-abdominal pressure which helps to strengthen the lumbar spine and the core of the body overall. For this reason, taking a deep breath, or adopting a deeper breathing pattern, is a fundamental requirement when lifting heavy weights.
Post-activation potentiation (PAP)Edit
The term post-activation potentiation is used to describe the increased performance or power output after performing a strength exercise.
During exercise the nervous system becomes increasingly active and an increased number of muscle fibres are recruited in order to aid the performance of the exercise. This effect is especially apparent during the lifting of heavy weights. Subsequently to the performance of the exercise, the increased nervous system activation and recruitment of muscle fibres continues for a period of time; this is referred to as post-activation potentiation, or the PAP effect, and may lead to an increased ability to apply power. For example, if a light weight is lifted, and then a heavy weight is lifted, and then the same light weight is lifted again, then the light weight will feel lighter the second time it is lifted; this is due to the PAP effect from the heavy lift. In complex training the PAP effect may be used to perform plyometric exercises more powerfully, or in contrast loading to perform resistance based exercises more powerfully. Ultimately, the usage of it in a training regime is to condition the trainee to perform with a heightened nervous system activation and increased muscle fibre recruitment; thereby resulting in the ability to move more powerfully as a standard.
Universal elements of power trainingEdit
The body’s core, sometimes referred to as the torso, helps all other movements of the body. In power movements this is especially the case as the core musculature is increasingly recruited in order to provide additional power. A stronger core also improves a person’s ability to balance. For these reasons core strength training is a fundamental part of power training.
A large amount of power can only be applied if the joints are strong enough to be able to cope with it and transfer it. If a joint is too weak then the power that can be applied by and through that joint is necessarily limited. This is especially the case in dynamic movements which require the rapid application of force to an external object and the absorption of impact forces by the body. For instance, a sprinter must have strong ankle joints in order for their foot to be able to apply leverage and transfer force to the ground, and also to help to absorb any impact forces when the foot is placed. Due to the requirements of any given stride, the ankle must be strengthened in all ranges of movement, including twisting. This can be achieved by hopping up and landing facing a different direction for example. A boxer would also need strong ankles but they would also have the added requirement of strong wrists in order to be able to transfer the power of their body adequately to their fists and hence to the target. An example of a wrist strengthening exercise is a one-handed barbell deadlift exercise, which requires increased utilisation of the wrist in order to stabilise the bar. Strong and flexible joints also help to prevent injury.
Proportions of strengthEdit
The body most efficiently produces power when its strength producing areas exist in particular proportions. If these proportions exist in the correct ratio to each other, then power generation can be optimised. Conversely, if one area is too strong, this may mean that it is disproportionately strong relative to other areas of the body. This may cause a number of problems: a weaker area of the body may be excessively strained by working in conjunction with the stronger area; and the stronger area may be slowed by working with the weaker area. Such problems hinder power development.
The optimum proportions of strength for power generation may be non-sports specific and based upon an ability to perform more powerfully in general, or sports specific and based upon the requirements of a particular sport. For example, a sprint cyclist may incorporate heavy back squats into their training regime in order to increase their leg strength, which can in turn help them to generate more power on the bike. However, this may lead to excessive leg strength being developed relative to their core strength. This may hinder any improvement to performance and increase the risk of injury. As such, they may incorporate forms of core training which helps them to perform their back squat more efficiently and reduce the risk of injury. The improved performance of the back squat would also mean it was more beneficial to the cycling action. In such examples the performance of the specific sport or exercise can be improved by ensuring that the involved areas of the body are trained to be in particular proportions of strength, as considered relatively to each other. It is notable that the performance of the sport or exercise alone does not necessarily lead to the body developing in its optimum proportions of strength in order to perform them more powerfully. As stated previously, this result is achieved with the aid of supplementary exercises which optimally influence the body’s proportions of strength so a more powerful performance can be achieved.
Leg spring and explosive powerEdit
A downward force applied by the torso to an already bent leg can help to generate a powerful springing potential in that leg. To activate this potential a sudden upward action which incorporates the straightening of the leg is undertaken. For instance, in a boxing stance where the left foot is positioned in front of the right foot, the boxer can position himself so his bodyweight is positioned forward over his lead left leg. If he then throws a lead left hook this will cause a fast and powerful straightening of the left leg which increases the punches overall power. If there was no downward pressure on the lead left leg prior to throwing the hook then this spring effect would be substantially reduced. This method of generating leg spring in order to increase power production can also be incorporated into jumps and this is usually done so instinctively. The jumper bends their legs, applys a downward pressure on their bent legs, and then powers upwards into the jump. Due to the spring potential generated prior to actually taking the jump, the leg straightening which is incorporated into the jump is more powerful than it would be otherwise. For rapid and repetitive sports, such as sprinting, it may be difficult for an athlete to consciously employ leg spring for every action. However, the instinctive usage of a leg spring action may be encouraged by specific training of the associated musculature, such as that of the legs, hips, and core. In this case, the athlete would be trained to emphasise the downward pressure on the bent leg prior to its straightening as part of the next step.
The sport of powerliftingEdit
Power training and the sport of powerlifting should be distinguished from one another, although there are some areas where they overlap. Powerlifting, as a sport, is often considered in regard to the three main lifts competitions are judged upon. These are the back squat, the deadlift, and the bench press. These exercises would not ordinarily be considered as power training exercises because they are not usually performed fast enough. The sport of powerlifting acquires its name due to the great amount of force that is required to lift very heavy weights. A major difference between the sport and power training is that in powerlifting competitions it is often required that the joints are locked for a lift to be registered as complete, whereas this would not usually be possible in power training because it would drastically inhibit the dynamic nature of the movements and lead to injury.
Historical examples of power-type trainingEdit
In terms of loaded plyometrics and ballistic training, jumping with weights, either handheld or in the form of armour, and throwing the discus and javelin featured as part of sport and military training regimes in Ancient Greece. Amongst the heaviest known throws in antiquity, was a one handed overhead throw of a stone weighing 140kg and which had a handle, by the Ancient Greek, Bybon. The record of this throw, which is sometimes translated as a lift, is inscribed onto the stone itself. Throwing a stone was also a popular pastime and military training method in the Medieval ages, with records of it including numerous depictions of a one-handed throw of a stone, roughly the size of a person’s head, from the shoulder.
Ancient Persian and Indian wrestlers used to swing heavy wooden clubs, called Meels in Persian, or stone-topped wooden clubs, called Gadas in India, in order to develop power. Notably, such exercises help to build strong and flexible joints.
In a similar vein to contrast loading, the Romans trained with weapons which were double the weight of ordinary weapons, in order that when they used the ordinary weapons they would feel lighter and easier to use.
In terms of heavy lifts, as a test of strength and manhood various societies, such as Celtic and Nordic ones, used to practice stone lifting. This involved lifting very heavy stones, usually over 100kg, either up to their waist or onto their shoulder. Two examples are the Menzies stone (115kg) in Scotland or the Husafell Stone (190kg) in Iceland.
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