The effect of age on hamstring passive properties after a 10-week stretch training

Area of Science:

• Gerontology
• Exercise Physiology
• Musculoskeletal Health

Background:

• Aging leads to degenerative musculoskeletal changes, reducing range of motion in elderly individuals.
• Stretch training is recommended for the elderly to counteract age-related mobility decline.
• Limited research exists on long-term stretch training's impact on passive muscle properties in older adults.

Purpose of the Study:

• To investigate hamstring elasticity in older adults after 10 weeks of stretch training.
• To compare these adaptations with those observed in a younger cohort.
• To understand the effects of aging on muscle passive properties and the response to stretching.

Main Methods:

• A 10-week static passive hamstring stretch training program was implemented.
• Participants included a younger cohort (mean age 24.0 years) and an older cohort (mean age 65.1 years).
• Hamstring passive properties were measured using an instrumented Straight Leg Raise Test.

Main Results:

• Both age groups showed increased range of motion, passive resistive force, and passive elastic energy after training.
• Passive elastic stiffness decreased in both groups.
• No significant differences in the changes of hamstring passive properties were observed between the younger and older groups.

Conclusions:

• While aging negatively affects muscle passive properties, older adults benefit from regular stretch training.
• Older individuals respond to stretch training similarly to younger individuals regarding hamstring passive properties.
• Consistent stretching can improve muscle elasticity and function across different age groups.