One of the first things covered (and equally forgotten) in any anatomy book are the planes of motion and axis of rotation for all human movement. Not as sexy as energy systems or squatting position, it’s almost as if the reason these are forgotten is because no one can argue about their purpose or function.
The past months have been filled with a ton of research and discussions with coaches, physical therapists and other professionals over an array of training topics, including plyometrics, assessments or limiting factors. But there was a common theme? Multiplane movement, and lack there of in training.
@Cali brought up a coaching limiting factor in her article, ‘Shitty Coaching Trifecta’, that truly can put an athlete in danger, Lack of Knowledge! I have personally witnessed this limiting factor in coaches who have applied programs that lead to movement pattern overuse injuries. This experience introduced me to problems that may develop through training primarily in one plane of motion. These include repetitive stress disorder and cumulative trauma disorder.
Limiting an athlete’s field performance by exclusively training to a single plane of motion, which then leads to overload or overuse injuries, earns the ‘first one fired’ stigma that plagues the industry. All from forgetting one of the first lessons in anatomy!
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Planes of Motion
A plane of motion is an imaginary two-dimensional surface through which a limb or body segment is moved. There are three specific planes of motion in which the various joint movements are classified. These three planes are derived from the dimensions in space and are at right angles of each other. The point at which the three planes of the body intersect is the center of gravity of the athlete.
The planes that divide the body exactly into two halves are referred to as cardinal planes, which are further subdivided into the sagittal, frontal, and transverse planes. There are an infinite number of planes within each half that run parallel to the cardinal planes.
The sagittal plane bisects the body from front to back, dividing it into right and left symmetrical halves. Generally, flexion and extension movements such as sit-ups, Olympic lifts, and bicep curls occur in this plane.
Sit-ups involve the spine and are performed in the cardinal sagittal plane, also known as the mid-sagittal plane. Bicep curls and knee extensions are performed in para-sagittal planes, which are parallel to the mid-sagittal plane. Even though the latter examples are not in the cardinal plane they are still considered movements in the sagittal plane.
As Seen in Field Strong: 4 Way Dead Bugs , See Saw Walk to Burpee
The frontal plane bisects the body laterally from side to side, dividing it into front and back halves. Abduction and adduction movements include jumping jacks, spinal lateral flexion, and the body moving laterally through space.
The transverse plane divides the body into superior and inferior halves. Generally, rotational movements of the trunk plus internal and external rotation of the hips and shoulders occur here.
Diagonal Planes of Motion
Although each joint movement can be classified within one of the three planes of motion, movements are usually not plane-specific, and occur within multiple planes. Movements in combined planes are described as diagonal planes of motion. Most sporting movements fall somewhere between parallel and perpendicular to the previously described planes and thus occur in a diagonal plane.
Photo Source: Manual of Structural Kinesiology, 19th Edition. (McGraw-Hill Education, 2012.)
To breakdown further, diagonal plane movement occurs in a high diagonal plane or one of two low diagonal planes. The high diagonal plane is utilized for overhand movements in the upper extremity, such as hitting a volleyball or a football toss. The two low diagonal planes include upper-extremity underhand movements, like bowling or a golf swing, and lower-extremity diagonal movements like a kicking (soccer) or field goals in football.
Axes of Rotation and Primal Movements
Axes are lines, real or imaginary, along which movement takes place, and are named in relation to their orientation. As movement occurs in a given plane, the joint moves or turns about an axis 90-degrees to that plane.
At Power Athlete we pay particular attention to how the pelvis rotates along these axes. The pelvis is the major link between the spinal column and the lower extremities, and plays a vital role in the athlete’s ability to produce strength efficiently and safely. We generally refer to movements involving pelvic rotation along the X-Axis as squats, movements with Y-Axis rotation as lunges, and movements with Z-Axis rotation as step ups. Inappropriate orientation of the pelvis can lead spine or hip joint accommodations which provide an unstable base for activities through any plane of motion.
Frontal (X) Axis: Squat
If the frontal plane runs from anterior to posterior, its axis must run from side to side. The movements of flexion and extension take place about this axis.
The action of the pelvis along the X-Axis includes posterior and anterior tilt through the sagittal plane, and the rotation along the axis is found in movements such as the squat, deadlift, and power clean.
As Seen in Field Strong: Squat, Deadlift to Power Clean Complex
Vertical (Y) Axis: Lunge
The vertical axis runs straight down through the top of the head and is at a right angle of the transverse plane of motion. The movements of medial and lateral rotation, and horizontal abduction and adduction occur on this axis.
The action of the pelvis along the Y-Axis includes posterior and anterior tilt through the sagittal plane. The rotation along the Y-axis is found in movements such as running, kicking, and lunging.
As Seen in Field Strong: High Knee Lunge, Sandbag Walking Lunges
Sagittal (Z) Axis: Movement occurring in the frontal plane rotates about a sagittal axis. The movements of abduction and adduction take place about this axis.
The rotation of the pelvis about the Z-axis is associated with the tilting up or down of the left and right iliac crests. This rocking action of the pelvis is found in movements such as walking, climbing stairs, and Step Ups.
There are optimal patterns, principles and timing sequences of pelvic stabilization and movement in training. Many of you have experienced this while working through Field Strong. Take this same approach to building Power Athletes.
Ensure Primal movement deficiency is not a limiting factor for on-field performance. Develop mobility, stability and competency in all three Primals during the warm ups and dynamic movement prep. These should include movements through all three planes of motion, not just the sagittal plane.
Once competency and control are established, load spine and rotate the pelvis over all three axis of rotation. Movements over the X-Axis will likely load the heaviest and fastest, but never neglect the other two!
Primals and the pelvic rotation through the X-Y-Z Axes embraces skill transfer from the weightroom to the field. These different pelvic rotations occur at different phases of athlete action in all dimensions and planes they experience on the arena of competition. Mastering these Primals, then building strength, power and speed through each provide the capacity to withstand the unstable patterns and volume of forces athletes face to make a play.
Improve the proficiency of all three Primals through the three planes of motion. Continue to challenge athletes using resistance, reaction and combining/re-sequencing Primals and planes of motion. The CrossFit Football Coach’s Course features a lecture on how to optimally program these Primals for developing Power Athletes and the application of the Primal strength template.
Too much training is stuck in the sagittal plane, either not knowing how else to move or solely focusing on big numbers. Even if an athlete does not have to move through the other planes of motion or axes of rotation in their sport, these elements must still be included into training to avoid overuse and overload injuries.
MS, CSCS, SCCC, CHES
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Former collegiate lacrosse defensive midfielder, 4-year letter winner and 3-year team captain. Coached strength and conditioning collegiately with Georgetown University football, Men's and Women's lacrosse and Women's Crew, as well with the University of Texas at Austin's football program. Apprenticed under Raphael Ruiz of 1-FortyFour-1 studying proper implementation of science based, performance driven training systems. Head coached CrossFit Dupont's program for two years in Washington D.C. Received a Master's in Health Promotion Management from Marymount University in 2010, and has been a coach for Power Athlete since October, 2012.
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