Muscle Stretching Exercises - Science topic

March 31, 2025

A fundamental contradiction arises when considering the relativistic interpretation of spacetime curvature alongside the widely accepted notion of cosmic expansion. In general relativity, gravity is not treated as a force but as the manifestation of spacetime curvature caused by massive bodies. However, if spacetime itself is expanding—stretching at cosmological scales—then the very fabric that supposedly curves under gravitational influence is in a state of dynamic transformation.

This presents an unavoidable paradox: how can spacetime maintain a stable and well-defined curvature around massive bodies if it is simultaneously undergoing large-scale expansion? If spacetime curvature is a tangible, physical distortion as relativity claims, then it should be subject to deformation or attenuation as the fabric of spacetime stretches. This would imply that local gravitational wells formed by massive bodies should either weaken or morph unpredictably over time. Yet, no such effects are observed. Instead, gravitational interactions remain stable and consistent over cosmic timescales, a characteristic that aligns more with a classical gravitational field than a malleable spacetime fabric.

Moreover, if the curvature of spacetime were truly a fundamental and rigid aspect of general relativity, then the expansion of spacetime should also stretch or distort these curvatures in a manner that would be empirically measurable. However, relativists make no such allowances; they conveniently separate local spacetime curvature (due to gravity) from large-scale cosmic expansion, even though both supposedly affect the same underlying spacetime. This selective treatment of relativistic curvature exposes a significant inconsistency: spacetime curvature is treated as physically real when describing gravity, yet as an abstract mathematical construct when dealing with cosmic expansion.

In contrast, classical mechanics and ECM provide a more consistent framework where gravity operates through a force-based field that is not inherently tied to the expansion of space itself. This eliminates the paradox of having a dynamically stretching medium that simultaneously holds stable curvatures, reinforcing the idea that the relativistic model of spacetime curvature is an opportunistic construct rather than a physically coherent reality.

Hello all,

I work on piezoresistive nanocomposite elastomer. For my electromechanical characterization experiment, I stretch and relax the polymer specimen for various number of cycle. However, I have noticed, when store the samples for 12 or more hours and use it again for characterization, the resistance of the sample increases to double. I protect the contact pad to prevent dust deposition yet i am loosing my samples. Has anyone faced the similar issue and can anyone suggest me how to prevent it?

thank you

I am working with an adolescent (11-14 y) culinary skills intervention that includes a short 30 minutes of moderate physical activity. I remember previously reading that stretching is not needed based on the age of the participants, duration and intensity of the activity.

ACSM sources were not at all helpful.

we want to plan a research study to determine the  impact of latissimus dorsi extensibility on chronic mechanical low back pain, while intervene in combination with lumber segmental spinal joints mobilization.

Target segment will be T1 - L5.

need your feed back? 

A pilot study in my university, we are searching information about muscular strength in a multiforce for leg extension. 

I wanna know more about this and your opinions

Thank you.

Does anyone know a review on the benefits of static stretching pre- and post-exercise? I only find reviews that show what static stretch can't do (e.g. injury prevention and reduces short-time muscle power).

Dear collegues,

Few studies verified these effects. Please help me with this question.

Best regards,

Gabriel Costa e Silva

Is it different for streched mucles fibers to do the seat-and-reach test with legs open (12 cm), instead of performing with legs united? Is there any article that evaluated that? 

I have a personal problem with cramps that I can not figure out. I've been through "it all" with magnesium(both oraly and oil), zink, salts, electrolytes and the likes. I've also tried to stick to a more LCHF diet, gluten free products and so on. Still, when I do triathlons or especially cycling: Cramps set in between 1,5-2 hrs. I'm also troubled by cramps on a day to day basis, even without doing any exercise at all. 

It's some kind of a personal crusade this, but I am really interested in articles or anything at all that can help me. Thanks.

I am looking for any good publications.

For the purposes of writing the dissertation project. It would be helpful in defining the method.

Thank you.