Single-Leg RDL Machine With Pivot Hip Stabilization
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Solution Overview
Problem
Existing Single-Leg RDL exercises suffer from misalignment, uneven rotational loading on the lower back, and reduced relative resistance due to lateral support mechanisms that compromise the unilateral nature of the exercise, posing risks of injury and limiting effective muscle recruitment.
Innovation Solution
A training apparatus providing lateral stability through a pivot joint structure that anchors the weight-bearing leg, allowing sagittal plane stability and maintaining hands-free weight loading, thereby distributing load evenly and enhancing muscle recruitment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lateral support mechanisms are used to provide stability, then stability is improved, but relative resistance on the target side decreases
Solution Approach 1:
The apparatus divides support functions into separate segments: the hip stabilizing piece provides lateral support while the pivot joint structure provides rotational support, allowing each component to address specific stability needs without interfering with the unilateral loading on the target muscles
Solution Approach 2:
The pivot joint structure acts as an intermediary between the hip stabilizing piece and the user's hip, allowing rotational movement while maintaining lateral stability. This intermediary mechanism transfers only the necessary stabilizing force without reducing the resistance on the target side
2Stability of the object's composition
If kickstand or bench variations are used for stability, then lateral stability is improved, but the exercise is no longer truly unilateral
Solution Approach 1:
The apparatus extracts the stability function from the supporting leg (as in kickstand or bench variations) and provides it through dedicated apparatus components (hip stabilizing piece and pivot joint), allowing the supporting leg to remain passive and the exercise to maintain its unilateral nature
Solution Approach 2:
The apparatus structure itself provides the lateral stability through its built-in hip stabilizing piece and pivot joint, eliminating the need for the user to actively engage the supporting leg for balance, thus maintaining true unilateral conditioning
3Stability of the object's composition
If hands are placed against fixed objects for stability, then misalignment and stability are improved, but rotational forces on the lower back increase
Solution Approach 1:
The pivot joint structure serves as an intermediary that allows the hip stabilizing piece to rotate with the hip movement, accommodating the natural rotation that occurs during the exercise while maintaining lateral stability, thereby preventing harmful rotational forces on the lower back
Solution Approach 2:
The pivot joint introduces dynamic rotational capability to the previously static hip support, allowing the apparatus to adapt to the changing angles of hip rotation during the exercise while maintaining proper alignment and reducing harmful forces
4Force
If higher absolute weight is used in bilateral RDL, then loading is improved, but evenness of load distribution on low back decreases
Solution Approach 1:
The apparatus segments the loading function by providing independent lateral support for each side through the hip stabilizing piece and pivot joint, allowing the user to load each side independently and evenly, unlike bilateral RDL where both sides share the load
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and effective muscle isolation with enhanced stability, allowing for heavier weights and optimal muscle recruitment without compromising the unilateral nature of the exercise, reducing the risk of injury and improving exercise efficacy.
Implementation Method 1
the hip stabilizing piece including a pivot joint structure that adjoins it to the end of the width-adjusting cantilever, while the users hip/pelvic region is pressed against the apparatus hip stabilizing piece (to negate lateral forces and alignment compensations), the pivot joint's rotating function will allow for the hip stabilizing piece to rotate along the sagittal plane
Data Source
AI summary
The Single-Leg Romanian Deadlift (Single-Leg RDL) machine is an exercise training invention which is used to stabilize a person's body while they carry out the Single-Leg RDL exercise. It enhances lateral stabilization while leaving the hips and torso free enough to execute the Single-Leg RDL exercise. Secondly, it optimizes recruitment of the hip extensor muscles by providing better stabilization of the “exercise target leg” along the sagittal plane. The former is accomplished by way of the apparatus providing the user's hip opposite the exercise target leg with a rotating hip stabilizing-pivot joint structure, that moves along the sagittal plane with the user so as to follow the changing angle of the user's hip as the user carries out the Single-Leg RDL. The latter is accomplished by the apparatus rigid frame which sturdily supports sagittal plane forces without tipping over and by way of lower leg supporting pads that anchor the user's exercise target leg thereby allowing the user to get optimal eccentric phase movement with minimal technique and balance demands. The apparatus also enables both hands to be free which results in heavier weight loading capacity and equal distribution on the low back muscles during the exercise.