What is a muscle line?
V-cut abs are a coveted shape for many people looking to define their abs. The V-shape or line is located where the obliques meet the transversus abdominis muscles. This line can be a physical display of hard work in the gym and discipline in the kitchen. To develop V-cut abs, target your lower abs and obliques.
What is the line of action of a muscle?
The lines of action approximate the position and the orientation of each muscular group according to the body movement. The endpoints of the line are calculated in the centroid of the origin and insertion points of each muscle (see Figure 12).
What is angle of pull and its importance?
The angle formed between the line of pull of a muscle and the longitudinal axis of the bone in which the muscle is acting. The line of pull is usually indicated by the joint angle. It affects the strength of muscle action; at only certain angles of pull can a muscle exert maximal tension.
What is angle of pull Slideshare?
1. The angle of pull may be defined as the angle between the line of pull of the muscle and the bone on which it inserts. Uniarticular muscles cross and act directly only on the joint that they cross.
What are the 4 types of muscle contractions?
Key TermsIsometric: A muscular contraction in which the length of the muscle does not change.isotonic: A muscular contraction in which the length of the muscle changes.eccentric: An isotonic contraction where the muscle lengthens.concentric: An isotonic contraction where the muscle shortens.
What are the 3 muscle actions?
There are three types of muscle contraction: concentric, isometric, and eccentric.
At what angle is your arm the strongest?
The results of the present study showed that muscle strength and muscle activation of the biceps were highest at the joint angle of 56°, whereas for the triceps, the highest muscle strength and muscle activation were found at the joint angle of 84°.
What is the muscles best angle to produce motion?
Rotary component: a force of a muscle contributing to bone's movement around a joint axis; greatest when muscles angle of pull is perpendicular to bone (ie: 90 degrees).
What are some causes of muscle fatigue?
Exercise and other physical activity are a common cause of muscle fatigue....Causes of muscle fatigueAddison's disease.age.anaerobic infections.anemia.anxiety.botulism.cerebral palsy.chemotherapy.More items...•
What is Arthrokinematics and Osteokinematics?
Introduction. 'Arthrokinematics' refers to the movement of joint surfaces. Arthrokinematics differs from Osteokinematics - in general Osteokinematics means bone movement and Arthrokinematics joint movement. The angular movement of bones in the human body occurs as a result of a combination of rolls, spins, and slides.
What is Rotary force?
Rotary motion occurs when a force is applied to one section of an object, and another section (such as the other end) remains fixed. In the body, this happens when a muscle pulls on one end of the bone and the other end is fixed (held still). The result is movement of the non-fixed end.
What is knee angle?
The knee angle is defined as the angle between a straight line joining the lateral malleolus – fibula head and a straight line joining the lateral femoral epicondyle – great trochanter.
What is the line of pull of a muscle?
The line of pull of a muscle is the long axis of the muscle. The angle of pull is the angle between the long axis of the bone (lever arm) and the line of pull of the muscle. The angle of pull and moment arm of the muscle both change as the joint goes through its range of motion. As demonstrated in figure 3.12, the maximal amount of torque is produced when the angle of pull of the muscle is 90° and the moment arm is at its greatest length. In this position all the muscle’s force is directed to produce only rotation. As the muscle’s angle of pull increases or decreases from 90°, the part of the force that contributes to rotational motion (rotational force) decreases, and the part that does not contribute to rotation (nonrotational force) increases, so the ability to produce rotational motion—or torque—diminishes. How much of a mus-cle’s force is used as rotational force (vector) and how much is used as nonrotational force (vector) depend on the angle of pull and the moment arm length at that angle. The muscle’s nonrotational force will tend to either stabilize the joint by providing compression, or it will destabilize the joint by providing a distraction force, depending on the angle of pull. The farther the angle of pull is from 90°, the more of the muscle’s force stabilizes or destabilizes the joint and the less of the muscle’s force rotates the joint. For example, the biceps, seen in figure 3.13, has a nonrotational force component that is pulling the ulna into the elbow and provides stability to the joint. It also has a rotational force component moving the forearm through its arc of
How does a muscle work?
When the muscle does not produce all its force for joint motion, some of its force is directed at either com-pressing or distracting the joint. Forces compressing the joint make it more stable, while forces distracting it make it less stable. However, there are occasions such as with arthritis when compressing a joint may be painful and therefore undesirable. Clinicians must be aware of forces created by muscles so they can modify the movement to meet patient needs.
Major pulling muscles in the human body
Here you will find a brief description of all the major muscles in the human body that help generate pulling movements. Muscles that help pull are the following: latissimus dorsi, hamstrings, trapezius and rhomboids, biceps brachii and forearms.
Trapezius and Rhomboids
Considered part of your upper back, the trapezius is a flat, triangle-shaped muscle that begins at the base of your skull and attaches itself to the back of your collarbone and shoulder blades. Underneath your trapezius are your rhomboids. You will find them easily in the middle of your upper back, right between your shoulder blades.
Latissimus Dorsi
Your lats – the largest muscles of your back – are a set of fan-shaped muscles that start low on your spine, spread across the width of your back, and taper off at your upper arm bones (where they meet your shoulders).
Biceps Brachii
You will find biceps brachii in the front of your upper arm. It’s made up of two separate heads that each attach at your shoulder socket and insert onto your radius – one of the two bones of your forearm. Wedged between your biceps and upper arm bone is the brachialis, a thin muscle that attaches to your ulna – the other bone of your forearm.
Forearms
The real estate between your elbows and your hands – otherwise known as your forearms – contains two sets of muscles: your wrist extensors and your wrist flexors. If you want your arms to look bigger, pay attention to your forearms.
Hamstrings
Your hamstrings are made up of three separate muscles comprising the entire back of your thigh – the biceps femoris (found on the outer rear portion of your thigh) and the semitendinosus and semimembranosus (the two muscles that make up the bulk of your inner rear thigh).
Putting it together: The muscles that help pull
In any pulling exercise your muscles pull the weight toward the body during the concentric portion of the movement and then lengthens as the weight moves away from the body during the eccentric portion of the exercise. Pulling exercises use prime movers such as the hamstrings, latissimus dorsi, trapezius and rhomboids, biceps, and forearm muscles.
How to reduce the risk of pulling a muscle?
You may be able to lower your risk of pulling a muscle by: Avoiding strenuous activities when your muscles are already fatigued or weakened. Cross-training with a variety of activities. Maintaining physical conditioning, flexibility, strength, and a healthy body weight.
What causes a pulled muscle?
A pulled muscle happens when you overstretch, stress, twist or tear the muscle. This damage can be acute or chronic and these two scenarios have different causes. Chronic muscle strains and pulls develop gradually over time.
What causes one group of muscles to overcompensate for another group?
Muscle imbalance, which causes one group of muscles to overcompensate for another group. Overcompensation is overworking and straining the muscle. Muscle tightness. Muscle fatigue or weakness from overuse or underuse. Poor conditioning.
What causes muscle strains and pulls?
Examples of causes include: Direct blow to the muscle. Excessive contraction of the muscle.
What are the complications of muscle strain?
Other complications include chronic pain, disability, loss of mobility, weakness, and poor quality of life.
What to do if you have a muscle strain?
See prompt medical care if you suspect a mild or moderate muscle strain. Seek immediate medical care (call 911) if you, or someone you are with, have symptoms of a severe muscle strain or tear including severe, disabling pain.
Why do muscles and tendons work together?
Muscles and tendons work together to enable movement. It’s common to injure both types of tissue during a strain. A similar injury—a sprain—affects ligaments, which hold bones to other bones at a joint. Some muscles are more susceptible to strains than others. It’s common to have a pulled neck muscle, pulled back muscle, or pulled calf muscle.
Line Pull
Written By Dave Decker, President, Becket Training & Consulting in CraneWorks Magazine
Understanding line pull
For each layer of wire rope on the hoist drum, the effective diameter of the drum increases by approximately twice the wire rope diameter. For example, if the wire rope diameter is 3/4″, the effective drum diameter will increase by 1 1/2″ for each layer on the drum.
Line Pull-Dealing with the problem
Remove any excess wire rope if possible. If this is not practical, then how can we test the crane? If the crane has the same capacity at a longer boom length, perform the test with the boom extended. If the crane still cannot lift the test load, check the allowable line pull for the particular hoist and layer of rope.
How to do the rack pull
The rack pull is fairly simple to set up and perform, although it does require a few essential pieces of equipment.
How the rack pull compares with a traditional deadlift
Traditionally, the deadlift is performed by strategically lifting a loaded barbell from the floor, with a slightly wider than shoulder-width grip, until the hips and knees are fully extended.
Benefits of the rack pull exercise
Regularly performing the rack pull comes with several potential benefits. Here are the most notable ones.
Muscles worked in the rack pull
The rack pull is a compound exercise that stimulates several muscle groups simultaneously.
Precautions and considerations for the rack pull
While the rack pull comes with several potential benefits, there are a couple precautions you should consider when performing the movement.
Who should do the rack pull
Considering its adaptable level of difficulty, the rack pull is suitable for almost all trainees — from those just getting started to those who are more advanced.
How to add it to your workout
The rack pull can be added to your workout routine as a stand-alone exercise or a deadlift accessory.
What Is the Rack Pull?
The rack pull is a variation of the regular deadlift, in which you have elevated the bar (in a rack or on a pair of blocks) in order to start the lift at a higher position. This makes the rack pull a partial deadlift with a shorter range of motion.
Strength in the Rack Pull vs Deadlift
How much stronger are you in the rack pull compared to a deadlift off the floor? While this of course varies between individuals, a study from 2012 gives us a hint of the general ratio. 1
What is the Difference Between Rack Pulls and Block Pulls?
Rack pulls and block pulls are the same exercise. The only difference is whether the barbell is resting on a rack or on a pair of blocks (or weight plates). Which one you use doesn’t affect you and your muscles at all.
What is the Proper Height for Rack Pulls?
How high should you place the barbell in the starting position? Should you do rack pulls above or below your knee?
Are Rack Pulls Bad for My Lower Back?
All forms of deadlifts can be both good and bad for your back – it all comes down to factors such as technique, load, and training volume.
Do Rack Pulls Build Mass?
Yes, rack pulls are excellent for building mass in especially your back, trapezius, glutes, and hamstrings.
Want to Build Strength and Mass Using Rack Pulls?
Want to try a deadlift program in which rack pulls and deficit deadlifts are the two primary drivers of strength and muscle? Check out our hypertrophy deadlift program Deadlift Builder. It is a program aimed at increasing the strength and mass in all of your most important deadlift muscles while building a back that resembles an old iron oak.
Which muscle region is activated during a rack pull movement?
Hamstrings. The ham region gets activated during a rack pull movement in a similar fashion to the gluteal. But significant results become possible based on the rack pull’s positioning. And just like quadriceps, the lower the starting height, the higher chance of hamstring extension and flexion work.
What muscles do rack pulls target?
Rack pulls work towards activating several muscle groups in each rep set. These pull target glute and hamstrings, trapezius, lumbar, and other body parts at the same time, offering more benefits for less.
Why do weightlifters use rack pulls?
Many weightlifters use rack pull to increase the weight and perfecting the lockout part of deadlift training. To start, aim for a similar amount of weight you use for a regular deadlift.
What is rack pull?
The rack pull is a variation of conventional deadlift with a focus on improving drag strength and hip/back development. The training routine also helps improve advanced deadlifting movements for professional weightlifters. You will need a squat rack or power rack and a barbell to perform this training exercise.
What is the upper back involved in?
The upper back is involved in the rack pull routine. With such involvement, ideal upper back tension for increased build potential is achievable. New muscle growth is the primary target of rack pull in this area for enhanced girth and loading potential.
Does a lower rack help with glutes?
Some may also work a set of pulls across all possible heights for significant results across all active muscle areas. Setting the rack to a lower position will help to elicit more glutes and hamstring involvement, bringing greater lower body strength. Placing the rack at a higher position improves lumbar better.
Can you lift too much weight during rack pulls?
Lifting too much weight during rack pulls, particularly at a beginner level, could be damaging. With too much weight lifted, the chances of muscle strain and injury get significant spikes.
