Unstable surfaces during push-ups increase upper trapezius and middle trapezius muscle activation

Why It Matters

Understanding how different exercise surfaces affect muscle engagement is crucial for designing effective rehabilitation programs and training protocols. This knowledge allows for more targeted interventions to strengthen specific muscle groups and improve shoulder stability.

Key Finding

Using unstable surfaces during push-ups leads to greater activation of the upper trapezius muscle in standard and knee push-ups, and increased activation of the middle trapezius and serratus anterior muscles during the push-up plus variation.

Key Findings

• Unstable surfaces increased upper trapezius activity during standard and knee push-ups.
• Unstable surfaces increased middle trapezius and serratus anterior activity during the push-up plus exercise.

Research Evidence

Aim: To systematically review and meta-analyze the electromyography (EMG) data of scapular stabilizers during push-up exercises performed on unstable surfaces by individuals without scapular dyskinesis.

Method: Systematic Review and Meta-Analysis

Procedure: A systematic search of four databases was conducted for studies examining scapular muscle activity during push-ups on unstable surfaces. Methodological quality was assessed, and data were combined using a random-effects model to calculate standardized mean differences (SMD) for muscle activation.

Context: Exercise science, rehabilitation, biomechanics

Design Principle

Surface instability can be a variable used to modulate muscle recruitment patterns for targeted strengthening.

How to Apply

When developing a new fitness device or exercise program for shoulder stability, test the impact of different surface types (e.g., stability balls, BOSU trainers) on muscle activation using EMG.

Limitations

The study focused on individuals without pre-existing scapular dyskinesis, and the findings may not directly apply to populations with such conditions. The specific types of unstable surfaces used across studies varied.

Student Guide (IB Design Technology)

Simple Explanation: Doing push-ups on wobbly surfaces makes some of your shoulder muscles work harder, especially the muscles in your upper and middle back.

Why This Matters: This research helps you understand how to make exercises more effective by changing simple things like the surface you use, which is important for designing better fitness or rehabilitation tools.

Critical Thinking: How might the findings change if the participants had pre-existing scapular dyskinesis?

IA-Ready Paragraph: This study highlights that the use of unstable surfaces during push-up exercises can significantly increase the activation of key scapular stabilizing muscles, such as the upper and middle trapezius. This finding is relevant to the design of rehabilitation and training equipment, as it suggests that incorporating instability can be a strategy to enhance muscle engagement and improve shoulder girdle stability.

Project Tips

• When researching exercises, look for studies that use objective measurements like EMG.
• Consider how the environment or equipment can alter the biomechanics of a movement.

How to Use in IA

• Use this research to justify the choice of exercise or equipment in your design project, explaining how it targets specific muscle groups.

Examiner Tips

• Demonstrate an understanding of how external factors, like surface stability, influence human performance and muscle engagement.

Independent Variable: Surface type (stable vs. unstable)

Dependent Variable: Electromyography (EMG) activity of scapular stabilizer muscles (e.g., upper trapezius, middle trapezius, serratus anterior)

Controlled Variables: Participant's lack of scapular dyskinesis, type of push-up variation (standard, knee, push-up plus)

Strengths

• Systematic review and meta-analysis provide a robust synthesis of existing evidence.
• Inclusion of EMG data offers objective measures of muscle activity.

Critical Questions

• What are the long-term implications of increased upper trapezius activation on shoulder health?
• How does the degree of instability affect muscle activation?

Extended Essay Application

• Investigate the biomechanical effects of different types of unstable surfaces on a range of human movements relevant to a specific design problem.

Source

Electromyography of scapular stabilizers in people without scapular dyskinesis during push-ups: a systematic review and meta-analysis · Frontiers in Physiology · 2023 · 10.3389/fphys.2023.1296279