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Geoff Lovell and Mike Lauder

Context:

Anecdotal evidence suggests a relationship between strength imbalances and injury incidence.

Objective:

To examine the relationship between bilateral strength imbalance and incidence of injury.

Participants and Design:

Thirty national- or international-standard flatwater kayakers were classified as noninjured, trunk injured, or upper-limb injured based on the number of days lost from training over the last 6 months. Bilateral strength imbalance was measured using a kayak ergometer, producing data for peak force and force impulse for each side of each stroke. Bilateral strength imbalance was then compared between the noninjured, trunk-injured, and upper-limb-injured groups by means of 2 one-way ANOVAs. No participants reported training days lost through lower-limb injury.

Results:

A significantly elevated bilateral peak-force strength imbalance was observed between the upper-limb-injured and the noninjured groups.

Conclusion:

These data support the existence of a relationship between strength imbalance and incidence of injury.

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Jason Lake, Mike Lauder, Neal Smith and Kathleen Shorter

This study compared differences between ballistic jump squat (B) and nonballistic back squat (NB) force, velocity, power, and relative acceleration duration, and the effect that the method used to identify the positive lifting phase had on these parameters. Ground reaction force and barbell kinematics were recorded from 30 resistance trained men during B and NB performance with 45% 1RM. Force, velocity, and power was averaged over positive lifting phases identified using the traditional peak barbell displacement (PD) and positive impulse method. No significant differences were found between B and NB mean force, and mean power, but B mean velocity was 14% greater than the NB equivalent. Positive impulse mean force was 24% greater than PD mean force, and B relative acceleration duration was 8.6% greater than the NB equivalent when PD was used to identify the end of the positive lifting phase. These results challenge common perceptions of B superiority for power development.