Does the angle of the pole affect the impulse force on the arms?

Yes—the angle of the pole significantly affects the impulse force on your arms. The key factor is how the force is transmitted from the ground to your body through the pole's shaft. Here's how it works:

The physics: impulse force

The impulse force is the peak force you feel when you plant the pole. It's a combination of the force you apply (pushing down) and the reaction force from the ground.

1. Vertical plant (90° angle)

• Force: The force is transmitted straight down the shaft.
• Effect: The force is directly transmitted into your wrist and forearm, creating a jarring impact.
• Impulse: This is the worst-case scenario for your wrists. The force is high and concentrated.

2. Slightly angled plant (10-20° forward)

• Force: The force is transmitted down the shaft, but some is absorbed by the pole's angle.
• Effect: The force is partially resolved into a forward push, reducing the impact on your wrist.
• Impulse: Significantly lower than a vertical plant. This is the recommended angle for walking.

3. Shallow angle (30°+ forward)

• Force: The force is transmitted at a shallow angle, meaning less of the impact is transmitted directly to your wrist.
• Effect: The pole tends to slide or bend, rather than transmit the impact.
• Impulse: Very low, but the pole may be less effective for support.

The key biomechanics

When you plant the pole at a slight angle (10-20° forward), the force is transmitted along the shaft. The angle allows some of the force to be absorbed by the ground and the pole's flex, reducing the peak force transmitted to your wrist. This is why many walkers are advised to plant the pole slightly ahead of their foot, rather than directly beside it.

The "right angle"

• Slightly angled (10-20°): The best angle for reducing impulse force.
• Vertical (90°): The worst angle for impulse force.
• Shallow (>30°): Low impulse, but less effective support.

Practical advice

• Plant the pole slightly ahead of your foot: This creates a natural 10-20° angle, reducing the impact on your wrists.
• Avoid planting the pole directly beside your foot: This creates a vertical angle and increases the impulse force.
• Use a relaxed grip: A tight grip increases the transmitted force.
• Adjust your length: A pole that is too short or too long can force you into an awkward angle.

The verdict

Yes, the angle of the pole significantly affects the impulse force on your arms. A slightly angled plant (10-20°) reduces the peak force, while a vertical plant (90°) maximises it. For best results, plant your pole slightly ahead of your foot and maintain a relaxed grip. This simple adjustment can significantly reduce wrist and arm fatigue over long walks.