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Related Concept Videos

Isotonic and Isometric Muscle Contractions01:22

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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
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Related Experiment Video

Updated: Jun 28, 2025

Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research
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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research

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An Isometric and Functionally Based 4-Stage Progressive Loading Program in Achilles Tendinopathy: A 12-Month Pilot

Thøger Persson Krogh1,2,3, Thomas Theis Jensen2, Merete Nørgaard Madsen4

  • 1Diagnostic Centre, University Research Clinic for Innovative Patient Pathways, Silkeborg Regional Hospital, Silkeborg, Denmark.

Translational Sports Medicine
|April 24, 2024
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Summary
This summary is machine-generated.

This pilot study shows a new home-based Achilles tendinopathy (AT) rehabilitation program using isometric exercises and progressive loading is feasible and safe. Athletes experienced significant improvements in pain and tendon structure, suggesting potential for future trials.

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Area of Science:

  • Sports Medicine
  • Musculoskeletal Rehabilitation
  • Orthopedic Surgery

Background:

  • Achilles tendinopathy (AT) presents a significant clinical challenge in musculoskeletal rehabilitation.
  • Current management strategies for AT often yield suboptimal outcomes for athletes.
  • A novel, home-based rehabilitation approach is needed to address these limitations.

Purpose of the Study:

  • To evaluate the feasibility and safety of a new 4-stage, home-based rehabilitation program for Achilles tendinopathy (AT).
  • To assess preliminary clinical improvements, including pain and functional scores, in athletes with chronic AT.
  • To gather data supporting the design of a future randomized controlled trial (RCT) for this AT intervention.

Main Methods:

  • A pilot study involving ten recreational athletes diagnosed with chronic midportion Achilles tendinopathy (AT).
  • Implementation of a 4-stage home-based rehabilitation program incorporating isometric exercises and progressive loading.
  • Primary outcome: VISA-A score at 1, 2, 3, 6, and 12 months; Secondary outcomes: Tenderness and ultrasonographic changes at 6 months.

Main Results:

  • Significant improvements in VISA-A scores were observed at 6 months (+26.9 points, P=0.004) and 12 months (+35.4 points, P=0.006).
  • Reduced tendon tenderness (P < 0.001) and decreased ultrasound measures of inflammation (Color Doppler activity reduced by 50%, P=0.023) and structural changes (hypoechoic area reduced from 29.1% to 8.5%, P=0.001) were noted.
  • High adherence and no safety issues confirmed the program's feasibility.

Conclusions:

  • The 4-stage home-based rehabilitation program, featuring isometric training and progressive loading, demonstrated significant improvements in athletes with Achilles tendinopathy (AT).
  • This approach proved feasible and safe, with high adherence rates among participants.
  • The positive outcomes warrant further investigation in a larger randomized controlled trial (RCT).