Keywords

emid, collagen, muscle damage, tendon recovery

Abstract

The recovery of the musculotendinous unit (MTU) following eccentric exercise is a complex process influenced by mechanical, structural, and nutritional factors. The MTU encompasses interconnected systems, including the Achilles tendon and calf muscles, which respond dynamically to mechanical loading. The interplay of these systems is critical to understanding recovery and optimizing interventions for performance and rehabilitation. Despite advances in the field, gaps remain in assessing measurement reliability, identifying sensitive recovery markers, and evaluating the efficacy of nutritional strategies such as collagen supplementation.

This dissertation is organized into three interrelated studies. Study 1 presented in Chapter 2 investigated the reliability of imaging and mechanical assessments of the MTU, including Achilles tendon length and stiffness, calf muscle thickness, and isometric force. High test-retest reliability was observed for most markers, underscoring their utility in clinical and research settings. Study 2 presented in Chapter 3 examined the sensitivity of these markers to eccentric exercise-induced damage. Results revealed significant time-dependent changes in muscle soreness, tendon thickness, and muscle structure, providing critical insights into the dynamic nature of recovery. Study 3 presented in Chapter 4 explored the role of collagen supplementation in recovery, finding limited acute effects on recovery markers but suggesting potential Achilles tendon benefits.

Together, these studies highlight the importance of employing multimodal assessment tools to capture the complexities of recovery processes. The findings emphasize the need for standardized protocols to ensure reliability and reproducibility in both research and clinical applications. Additionally, the limited acute benefits observed for collagen supplementation suggest that its effects may be more pronounced in chronic adaptations, warranting further investigation.

Completion Date

2025

Semester

Spring

Committee Chair

Fukuda, David

Degree

Doctor of Philosophy (Ph.D.)

College

College of Health Professions and Sciences

Department

School of Kinesiology and Rehabilitation Sciences

Identifier

DP0029412

Document Type

Dissertation/Thesis

Campus Location

Orlando (Main) Campus

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