Overview[ edit ] Between and Malthus published six editions of his famous treatise, updating each edition to incorporate new material, to address criticism, and to convey changes in his own perspectives on the subject. He wrote the original text in reaction to the optimism of his father and his father's associates notably Rousseau regarding the future improvement of society. Malthus also constructed his case as a specific response to writings of William Godwin — and of the Marquis de Condorcet —
Lower abdominal myth Flexible hip flexors and strong abdominal muscles are particularly important before performing the Decline SitupRoman Chair SitupLeg Raises and Hip Raises since the hip becomes fully extended. As for having your feet anchored affecting movement from the origin rather than the insertion, this essentially does not affect its activation.
The muscle contracts through out itself, despite the end that moves origin or insertion. Are the forces through the Latissimus Dorsi somehow different in pullup as compared to the pulldown? Your old physics or biomechanics book will clarify the forces are indistinguishable.
Incidentally, the crest of the pubis is often referred to as the origin of the Rectus Abdominis, anyway. Obviously, man made classification systems do not perfectly fit all constructs; these semantics merely propitiate rhetorical arguments. In a horizontal position, the anchoring of the feet will allow you to stabilize the lower body without extending the legs to counter the leverage and momentive forces of the upper body during its extended leverage in the lower position.
Remember when the hips are extended the Psoas is activated more. In an incline motion, the anchoring of the feet Physics extended essay criteria you from sliding back, or falling on your head.
If a client has such weak abdominal that their psoas is pulling on the back, corrective exercise should be performed months before they start on intense hip flexor exercises. To say sit ups are bad, or any other exercise is bad is a gross over-generalization.
Also see Are Sit-ups Safe? Even Arnold Schwarzenegger as well as countless other weight trainers perform their cable rows with an articulating spine. The body adapts to specific stresses placed on the body as long as certain principles are followed.
Both the muscles and joint structures can adapt to progressive stresses. Even the elastic limit of a tendon or ligament can be enhanced by exercise and training and can be reduced by aging and inactivity Tendon and ligament adaptation.
Ligaments are not inert. During the seated row with spinal articulation you say, "Leaning over while returning, puts the stress solely on the ligaments of the spine since the musculature is relaxed.
Even if the exerciser deliberately relaxed the musculature with the spine completely flexed, the stretch in the lower back muscles would activate the muscle spindles, or stretch receptors, maintaining an involuntary contraction for several seconds.
As with any exercise, moving through the full range of a joint's motion is recommended, yet not beyond. Ironically, splinting the lower back during all movements can lead to the degeneration of the joint structures of the spine Nelson Including an exercise such as the Cable Seated Row that involves actual dynamic movement of joint structures and accompanying muscles are important for lower back integrity.
As the saying goes, "Use it or lose it". The Cable Seated Row with articulating spine, the Cable One Arm Twisting Rowas well as the Straight Leg Deadlift below offer more natural forces to entire kinetic chain as compared to Lever Back Extension and can be implemented progressively for those requiring high degrees of functionality such as certain athletes and manual laborers.
It is interesting to note that competitive rowers, including athletes at the Olympic level flex their spine throughout the rowing movement. Also see Low Back Debate.
The Cable Straight Back Seated Row has been included for those who desire less lower back involvement during this movement. Straight Leg Deadlift Fleck and Falkel cite a study that demonstrates compression forces are not excessive when the lumbar spine is flexed and the weight is held close to the body.
In addition, intra-abdominal pressures generated during heavy lifts reduce extensor movements, thus further reducing stresses on the lumbar spine. These techniques are used in the execution of straight leg deadlift.
Notice the weight is lowered to the top of the feet and not just beyond the feet. Illustrations in articles suggesting destructive forces on the spine are quite different than the straight leg deadlift.
According to the ExRx description and animation, the weight is kept very close to the body. Positioning the resistance away from the body subjects forces on spine structures much greater than the straight leg deadlift described.
Performing a movement with a weight or range of motion that is significantly beyond what they are accustomed greatly increases risk of injury, particularly with this movement, but that does not make it a dangerous exercise when performed with common sense guidelines.
Keep bar over top of feet, close to legs. Do not pause or bounce at bottom of lift. Do not lower weight beyond mild stretch throughout hamstrings and low back. Full range of motion will vary from person to person.
Choose platform height that allows contact with floor with slight stretch or set to height that allows bar to be lowered only millimeters from floor during warm up.
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This small reserve allows additional room to accommodate the hips loosen up and the grip to give slightly, but not so much that would increase risk of descending too far down, beyond a slight stretch.
Those with less flexibility may not even need to stand on platform. When finished with set, dismount by lowering weight with knees bent and low back straight.High School Scholarships Our new general application will go live November 26, !
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Or merely empiricism? [Back to Start] Note added April at the time I wrote this, I had no idea that . Concerned visitor, Muscular imbalance and inflexibilities may be attributed to injury, but the causes of lower back injury are poorly understood (Nelson ).
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It's theoretically possible, yes. The IB Extended Essay (or EE) is a 4, word structured mini-thesis that you write under the supervision of an advisor (an IB teacher at your school), which counts towards your IB Diploma (to learn about all of the IB diploma requirements, check out our other article).