Isometric exercise

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The 'plank' is a type of isometric hold which can intensively activate the body's core musculature. It may also be performed by balancing on the forearms. Plank.jpg
The 'plank' is a type of isometric hold which can intensively activate the body's core musculature. It may also be performed by balancing on the forearms.
The 'side plank' is a variation designed to strengthen the muscles on the side of the core, such as the obliques. Side Plank.jpg
The 'side plank' is a variation designed to strengthen the muscles on the side of the core, such as the obliques.

An isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint. The term "isometric" combines the Greek words isos (equal) and -metria (measuring), meaning that in these exercises the length of the muscle and the angle of the joint do not change, though contraction strength may be varied. [1] This is in contrast to isotonic contractions , in which the contraction strength does not change, though the muscle length and joint angle do.

Contents

The three main types of isometric exercise are isometric presses, pulls, and holds. They may be included in a strength training regime in order to improve the body’s ability to apply power from a static position or, in the case of isometric holds, improve the body’s ability to maintain a position for a period of time. Considered as an action, isometric presses are also of fundamental importance to the body’s ability to prepare itself to perform immediately subsequent power movements. Such preparation is also known as isometric preload.

Overcoming and yielding isometrics

An isometric action is one where the observable angle of the joints is maintained. While this definition always applies there are various sub-definitions which exist in order to emphasise how effort is being applied during specific isometric exercises. In a yielding isometric exercise the ambition is to maintain a particular body position; this may also be called maintaining an isometric hold. In an overcoming isometric exercise the ambition is to push or pull against either another part of the self, which pushes or pulls back with equal force, or to move an immovable object. On this basis, an overcoming isometric may additionally be referred to as being an isometric press or an isometric pull.

Unweighted isometrics

In unweighted isometrics the exerciser uses only themselves for resistance. For example, holding a crouched position, or pressing the palms of the hands against each other. Where by the self presses against itself, this is also referred to as self-resistance or Dynamic Tension training.

Weighted isometrics

Weighted isometrics involve the additional holding of a weight, and the pressing or pulling of an immovable weight or structure. For example, in a bench press set-up the barbell can be held in a fixed position and neither pushed upwards or allowed to descend. Alternatively, in a mid-thigh pull set-up, a person can attempt to pull a fixed, immovable bar upwards.

Isometrics in combination with dynamic exercise

As this weight lifter completes his lift he will combine dynamic leg movement with an isometric holding of the barbell. Ryvok 155 kg 2.jpg
As this weight lifter completes his lift he will combine dynamic leg movement with an isometric holding of the barbell.

Isometric training is rarely used by itself and it is usually incorporated into a wider training regime. For instance, an isometric plank may be incorporated into a plyometrics regime. In addition, when a subject performs a dynamic movement, supportive muscle groups can work isometrically. For example, if a person squats while holding a dumbbell in front of their chest, then their arm action will be relatively isometric, whilst their leg action will be dynamic. Such a relationship between an isometric hold and a dynamic movement is often found in weightlifting: participants commonly hold a barbell overhead with straight arms whilst straightening their legs as they stand up from a squat position. This allows for the legs to be primarily responsible for the lifting of the weight.

In most sporting contexts, however, the use of a pure isometric action is rare. In skiing, for example, the skier consistently maintains a crouched position. Whilst this may be considered to be an isometric hold, there is also an amount of dynamic movement as the skier alters how deep the crouch is during their travel. Thus, isometrics can be said to be involved in and supportive of the overall skiing action, even though it is not solely isometric in nature.

In weight training and calisthenics, it is often the case that one phase of the exercise is more difficult to perform than others. If the exerciser tends to fail at this point then it is referred to as a sticking point. An isometric hold may be incorporated to strengthen the exerciser's action at this point. For instance, a sticking point in a heavy back squat is usually the lowest position reached. An isometric hold can be adopted in this position in order to strengthen the lifter's ability to hold the weight there. Over a period of training this can help them to lift the weight more easily from this position and thereby eliminate the sticking point. [2]

Isometric presses as preparation for explosive power movements

The isometric preloading of muscles is instinctively performed in order to generate power to be used in subsequent dynamic movements: a fundamental element of this muscular preloading is the performance of an isometric press action. An everyday example is a person getting up off a chair. They first raise their posterior off the chair and then perform a pressing action downwards on their bent legs. As the bent legs resist the downward force upon them in equal measure, an isometric press is generated. From this point, the person then straightens and stands up. A more dynamic example is a vertical jump. Here, the jumper crouches down and adopts a similar isometric press before powering upwards into the jump. [3] The employment of isometric presses in order to aid explosive power movements is also found in sports such as boxing. Here, the boxer may bend their lead leg, while positioning their torso and its respective bodyweight over it, so there exists equal forces between the upwards force of the bent leg and the downward force of the torso. The boxer then throws a lead hook from this position and the forces from the isometric press are channelled into the punch and help to increase its overall power. [4] Such a channelling of force fundamentally represents the purpose of an isometric preload: which is as a preparatory action to aid a subsequent power movement.

Force measurement devices for isometric actions

History

Müller and Hettinger

In the 1950s, German scientists Dr. Erich Albert Müller [6] and Theodor Hettinger [7] "observed that contractions involving less than about one third of maximum strength do not train the muscle. If the contraction of a muscle exceeds one third of its maximum strength, its mass grows and hence also its strength". [8] The study at the Max Planck Institute consisted of over 200 experiments over a ten-year period. Theodor Hettinger published his book Physiology of Strength. [9] They both developed a training program based on isometrics exercise. [10]

In the 1960s, professor James A. Baley put isometrics to the test with a class of 104 college students at the University of Connecticut to study the results on tests measuring increases in strength, endurance, coordination, and agility. The original article showed significant gains after a 4 week program of isometric exercises. [11] Isometric exercises were first brought to the modern American public's attention in the early days of physical culture, the precursor to bodybuilding. Many bodybuilders had incorporated isometric exercises into their training regimens. [12]

Medical uses

Isometric exercises can also be used at the bedside to differentiate various heart murmurs; the murmur of mitral regurgitation gets louder [13] as compared to the quieter murmur of aortic stenosis. [14] They can also be used to prevent disuse syndrome in a limb that has been immobilized by a cast following a fracture.

Isometric exercises are recommended in case of injury. The exercises help maintain strength and promote recovery. [15]

NASA studies

NASA has researched the use of isometrics in preventing muscle atrophy experienced by astronauts as a result of living in a zero gravity environment. Isometrics, muscle lengthening and muscle shortening exercises were studied and compared. The outcome showed that while all three exercise types promoted muscle growth, isometrics failed to prevent a decrease in the amount of contractile proteins found in the muscle tissue. The result was muscle degradation at a molecular level. As contractile proteins are what cause muscles to contract and give them their physical strength, NASA concluded that isometrics may not be the best way for astronauts to maintain muscle tissue. [16]

See also

Related Research Articles

<span class="mw-page-title-main">Calisthenics</span> Form of strength training exercises

Calisthenics or callisthenics (/ˌkælɪsˈθɛnɪks/) is a form of strength training consisting of a variety of movements that exercise large muscle groups, such as standing, grasping, pushing, etc. These exercises are often performed rhythmically and with minimal equipment, as bodyweight exercises.

<span class="mw-page-title-main">Push-up</span> Calisthenics exercise

The push-up is a common calisthenics exercise beginning from the prone position. By raising and lowering the body using the arms, push-ups exercise the pectoral muscles, triceps, and anterior deltoids, with ancillary benefits to the rest of the deltoids, serratus anterior, coracobrachialis and the midsection as a whole. Push-ups are a basic exercise used in civilian athletic training or physical education and commonly in military physical training. They are also a common form of punishment used in the military, school sport, and some martial arts disciplines. Variations of push-ups, such as wide-arm push-ups, diamond push-ups target specific muscle groups and provide further challenges.

<span class="mw-page-title-main">Muscle contraction</span> Activation of tension-generating sites in muscle

Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state.

<span class="mw-page-title-main">Strength training</span> Performance of physical exercises designed to improve strength

Strength training or resistance training involves the performance of physical exercises that are designed to improve strength and endurance. It is often associated with the lifting of weights. It can also incorporate a variety of training techniques such as bodyweight exercises, isometrics, and plyometrics.

<span class="mw-page-title-main">Plyometrics</span> Maximum-intensity explosive exercises

Plyometrics, also known as jump training or plyos, are exercises in which muscles exert maximum force in short intervals of time, with the goal of increasing power (speed-strength). This training focuses on learning to move from a muscle extension to a contraction in a rapid or "explosive" manner, such as in specialized repeated jumping. Plyometrics are primarily used by athletes, especially martial artists, sprinters and high jumpers, to improve performance, and are used in the fitness field to a much lesser degree.

<span class="mw-page-title-main">Kettlebell</span> Cast iron or cast steel ball with a handle attached to the top

In weight training, a kettlebell is a cast-iron or cast-steel ball with a handle attached to the top. It is used to perform many types of exercises, including ballistic exercises that combine cardiovascular, strength and flexibility training. Kettlebells are the primary equipment used in the weight-lifting sport of kettlebell lifting.

Super Slow is a form of strengthening physical exercise popularized by Ken Hutchins. Super Slow is Hutchins' trademarked name for the High intensity training approach advocated by Arthur Jones. It is based on ideas from the 1940s and 1960s called 10/10 "muscle contraction with measured movement" and implemented using fixed weight Nautilus machines. In more recent times, such "Time Under Load" ideas have seen a renaissance with Dr Doug McGuff's best selling Body by Science.

<span class="mw-page-title-main">Vertical jump</span> Jump vertically in the air

A vertical jump or vertical leap is the act of jumping upwards into the air. It can be an exercise for building both endurance and strength, and is also a standard test for measuring athletic performance. It may also be referred to as a Sargent jump, named for Dudley Allen Sargent.

<span class="mw-page-title-main">Pull-down (exercise)</span> Strength training exercise

The pull-down exercise is a strength training exercise designed to develop the latissimus dorsi muscle. It performs the functions of downward rotation and depression of the scapulae combined with adduction and extension of the shoulder joint.

Bullworker is a product and fitness company that specializes in isometric exercise. The original portable home fitness device was invented by Gert F. Kölbel in 1962.

<span class="mw-page-title-main">Outline of exercise</span> Overview of and topical guide to exercise

The following outline is provided as an overview of and topical guide to exercise:

<span class="mw-page-title-main">Diastasis recti</span> Medical condition

Diastasis recti, or rectus abdominis diastasis, is defined as a gap of about 2.7 cm or greater between the two sides of the rectus abdominis muscle. The distance between the right and left rectus abdominis muscles is created by the stretching of the linea alba, a connective collagen sheath created by the aponeurosis insertions of the transverse abdominis, internal oblique, and external oblique. This condition has no associated morbidity or mortality. Physical therapy is often required to repair this separation and surgery is an option for more severe cases. Standard exercise rarely results in complete healing of the separated muscles.

<span class="mw-page-title-main">Roman chair</span> Exercise equipment

The Roman chair is a piece of exercise equipment. The equipment is mainly used for the lower back, but can also target the gluteal muscles, hamstring, and abdominal. The definition of the equipment, and what 'Roman chair exercise' specifically means, is not clear.

An isometric exercise tool is a device used to exercise most body parts including the wrist and is often used as part of physical therapy or in order to build muscle strength in a low impact manner. Devices can range in size from large bulky machines used by physicians to small hand-held devices that can be used by an individual. Isometric devices have been used for centuries. The first devices did not display the users' output; nowadays there are devices that can digitally output the users force. Before that some devices used an analog format.

Eccentric training is a type of strength training that involves using the target muscles to control weight as it moves in a downward motion. This type of training can help build muscle, improve athletic performance, and reduce the risk of injury. An eccentric contraction is the motion of an active muscle while it is lengthening under load. Eccentric training is repetitively doing eccentric muscle contractions. For example, in a biceps curl the action of lowering the dumbbell back down from the lift is the eccentric phase of that exercise – as long as the dumbbell is lowered slowly rather than letting it drop.

Football strength is a training regime, considered the most complex physical quality to be developed by an athlete. The training regime, exercises used, how the exercises are performed, and the types of equipment all play important roles in achieving desired results.

Street workouts are a physical activity performed in outdoor parks or public facilities. The movement behind street workouts became popular in Russia, Israel, Myanmar, Morocco, Eastern Europe, and the United States, especially in New York City, Los Angeles, Chicago, Philadelphia, Miami, Baltimore, Washington, D.C., and other urban East Coast neighborhoods. It is a combination of athletics, calisthenics, and sports. "Street workout" is a modern name for calisthenics in outdoor parks. There are also street workout teams and organized competitions for exercises such as pull-ups, chin-ups, push-ups, dips, rows, muscle-ups, sit-ups and squats. A street workout also involves static (isometric) holds such as the human flag, front lever, back lever, L-sit and planche.

<span class="mw-page-title-main">Power training</span> Common type of speed and strength training

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.

<span class="mw-page-title-main">History of physical training and fitness</span> History of physical training

Physical training has been present in human societies throughout history. Usually, it was performed for the purposes of preparing for physical competition or display, improving physical, emotional and mental health, and looking attractive. It took a variety of different forms but quick dynamic exercises were favoured over slow or more static ones. For example, running, jumping, wrestling, gymnastics and throwing heavy stones are mentioned frequently in historical sources and emphasised as being highly effective training methods. Notably, they are also forms of exercise which are readily achievable for most people to some extent or another.

References

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  4. Dempsey, Jack, 'Stance' in Championship Fighting Explosive Punching and Aggressive Defense, 1950
  5. "Isometric Mid-Thigh Pull (IMTP) - Science for Sport". 13 October 2018.
  6. Erich A. Mueller, "The Regulation of Muscular Strength", Journal of the Association for Physical and Mental Rehabilitation, 11 (March–April, 1957): 41-47.
  7. Hettinger, T., & Müller, E. A. (1953). Muskelleistung und muskeltraining. Arbeitsphysiologie, 15(2), 111-126.
  8. Sweating in the Service of Science, Occupational Physiology
  9. Physiology of Strength. Theodor Hettinger, M.D. Edited by M. H. Thurwell. Springfield, Illinois, Charles C. Thomas, 1961
  10. Crakes, J. G. (1957). An analysis of some aspects of an exercise and training program developed by Hettinger and Mueller. Unpublished master's thesis, University of Oregon.
  11. Baley, James A. (1966-10-01). "Effects of Isometric Exercises Done with a Belt upon the Physical Fitness Status of Students in Required Physical Education Classes". Research Quarterly. American Association for Health, Physical Education and Recreation. 37 (3): 291–301. doi:10.1080/10671188.1966.10614754. ISSN   1067-1188.
  12. "Strength Training - Isometric Exercise". SPMESSENGER.com. Archived from the original on 2008-01-29. Retrieved 2008-11-10.
  13. Ching, W. "Evaluation of Cardiac Murmurs in the Clinic Setting" (PDF). University of Chicago. Archived from the original (PDF) on 2008-12-17. Retrieved 2008-01-10.
  14. Cassidy J, Aronow WS, Prakash R (1975). "The effect of isometric exercise on the systolic murmur of patients with idiopathic hypertrophic subaortic stenosis". Chest. 67 (4): 395–397. doi:10.1378/chest.67.4.395. PMID   1168115.
  15. Allen, Trevor J.; Jones, Tyson; Tsay, Anthony; Morgan, David L.; Proske, Uwe (2018). "Muscle damage produced by isometric contractions in human elbow flexors". Journal of Applied Physiology. 124 (2): 388–399. doi: 10.1152/japplphysiol.00535.2017 . PMID   29074710. S2CID   3465982.
  16. Barry, PL; Phillips, T (2004-10-12). "Why do Workouts Work?". NASA . Retrieved 2008-01-10.

Further reading