Detection of exercise load-associated differences in hip muscles by texture analysis.

Area of Science:

• Sports Medicine
• Radiology
• Biomedical Engineering

Background:

• Understanding the relationship between physical activity and muscle structure is crucial for sports science and injury prevention.
• Magnetic resonance imaging (MRI) offers detailed insights into soft tissues, but its application in quantifying exercise-induced muscle adaptations requires further exploration.
• Muscle texture parameters derived from MRI may serve as objective biomarkers for evaluating the effects of different exercise regimens.

Purpose of the Study:

• To investigate the association between specific physical exercise loading types and texture parameters in hip muscles using MRI.
• To determine if MRI-derived muscle texture analysis can differentiate between athletes engaged in various impact and magnitude exercise categories and non-athletic controls.
• To identify which hip muscles exhibit significant textural changes in response to distinct long-term exercise stimuli.

Main Methods:

• Ninety-one female athletes from five distinct exercise-loading groups (high-impact, odd-impact, low-impact, nonimpact, high-magnitude) and 20 non-athletic controls underwent hip MRI scans.
• Texture parameters were quantitatively computed from MRI images of the gluteus maximus, gluteus medius, iliopsoas, and obturator internus muscles.
• Statistical analysis (Mann-Whitney U-test) was employed to compare muscle texture differences between athlete groups and the control group.

Main Results:

• Significant textural differences were observed in multiple hip muscles (gluteus medius, iliopsoas, obturator internus) between high-impact athletes (jumpers) and controls.
• Odd-impact athletes (soccer, squash) showed significant textural variations in the gluteus maximus, gluteus medius, and obturator internus compared to controls.
• Low-impact athletes (endurance runners) exhibited significant textural differences across all studied hip muscles, while nonimpact athletes (swimmers) showed differences only in the gluteus medius. Powerlifters (high-magnitude) displayed no significant differences.

Conclusions:

• MRI texture analysis is a quantitative tool capable of detecting exercise-associated textural alterations in hip muscles.
• Specific types of long-term physical loading, particularly high-impact and low-impact exercises, induce discernible changes in hip muscle texture.
• The findings suggest that MRI texture parameters can serve as objective indicators of exercise-induced adaptations in skeletal muscle morphology.