The Rowing Stoke

1. The Rowing Stoke Biomechanics Unit Summative Kellen Brenchley PSE 4U1

2. Focus Point: The Handle • When analyzing the rowing stroke we will be focused on the handle of the erg. • The handle is most important because when your in a boat the speed of the handle directly relates to the speed of your boat.

3. Preliminary Movement • Since the stroke is a cycle we will start the movement at the catch. • Muscles involved: - Flexion of the phalanges - Contraction of gastrocnemius and soleus - Contraction of the hamstrings

4. Critical Instant • The oar entering the water this is the critical instant, as this if the moment when the force is applied. • The muscles begin to contract explosively and this begins the stroke. • Muscles involved: - Rhomboids - Quadriceps - Hamstrings - Gastrocnemius - Soleus

5. Force Producing Movement • The force producing movement in the rowing stroke is the drive. • This uses all the major joints in the body from largest to smallest, creating the maximum velocity and force. • Muscles involved: - Trapezius - Hamstrings - Deltoids - Gastrocnemius - Triceps - Soleus - Rhomboids -Quadriceps - Pectoralis Major - Wrist Extensors and Flexors - Rectus Abdominus - Gluteus

6. Recovery/Follow-through/Backswing • The rowing stroke has two main components, the drive and the recovery. The recovery, the follow-through and the backswing are all part of the recovery. • Muscles involved: - Deltiods - Hamstings - Triceps - Quadriceps - Biceps - Pectoralis Major - Rectus Abdominus - Internal and External Obliques - Wrist extensors and flexors

7. Planes and Axis Used • A rower always moves in a straight line. When the boat is moving through the water and when the rower is moving up and down the slide he will aways be moving through the sagittal plane. • The rower might tip from side to side if s/he is unbalenced this would be movement through the frontal plane • The axes used is that of the antereoposterior axes. The rotation occours in the hip joint and in knee joint

8. Levers • The main lever used in the rowing stroke is that of the oar in the water, this is a first class lever.

9. Free Body Diagrams

10. Velocity and Acceleration

11. Logger Pro Graph

12. 7 Principles Biomechanics • Five of the seven priciples are used in the rowing stroke • Stability – Keeping the boat steady and level. • Maximum Effort – Joints used: Ankle, knee, hip and shoulder • Linear Motion 1 – Pulling the oar through the water, the harder you pull the faster you go • Linear Motion 2 – The movent occours because of the high force applied to the oar.This force results in movement in the opposite direction • Angular motion – In order to have a powerful stroke you must swing through your hips.

13. Newton's Laws • The Law of Inertia • Objects that are in motion tend to stay in motion unles an external force is applied to it • Eg. The force from the oars move boat, but water apposes the movement of the boat • The Law of Acceleration • A force applied to a body causes an acceleration of that body of a magnitude proportional to the force, in the direction of the force, and inversely proportional to the body’s mass • Eg. The harder you pull the oar the faster you can move the boat • The Law of Reaction • For every action there is an equal and opposite reaction. • Eg. Push the water with your oars and the water pushes back just as hard.

14. Final Analysis • Tecnical improvements from the Video • Explode out of the catch • More lay-back • Straighter back