Effects of sixteen weeks of two high-intensity flexibility training methods (dynamic versus static) on joint range of motion (ROM) in older adults: a comparative quasi-experimental study

Imagine your body as a rusty old garden gate. Over the years, the hinges get stiff, the wood swells, and the gate just won't swing open as wide as it used to. For older adults, this "rust" is a loss of Range of Motion (ROM)—the ability to twist, reach, and stretch. When the gate gets stuck, simple things like putting on shoes or looking over your shoulder become a struggle, and the risk of tripping and falling goes up.

Two groups of older women (all 60+) decided to try and oil those hinges. They didn't just do a little gentle stretching; they went for a 16-week high-intensity workout, three times a week. But they tried two very different tools to get the job done.

The Two Teams: The Stick vs. The Mat

Team Dynamic (The Stick Assist):
This group used a long stick to help them. Think of it like having a friend push the gate open for you. They did dynamic movements, using the stick to mechanically assist them in reaching further. The idea was that the stick would act as a lever, helping them get a better stretch.

Team Static (The Mat Hold):
This group didn't use any tools. They got on a mat and held their positions still. Imagine finding the perfect spot to stretch and then just staying there, holding the gate open with your own muscles until it got used to the new angle.

Both groups pushed hard. They didn't just stretch; they stretched until it felt like "tolerable pain" (a score of 81–90 on a special scale called PERFLEX). They were both working at the same high intensity.

The Big Surprise: The Stick Didn't Help

After 16 weeks, the researchers measured the gates again with a precise tool called a goniometer (basically a fancy protractor for joints). Here is what happened:

1. The Static Group (Mat) Won the "Hip Extension" Race
The women on the mats made real progress. Their hip extension (how far they could swing their leg backward) improved by +5.2°.

• The Verdict: The static method was significantly better than the stick method for this specific move. In fact, the stick group actually saw their hip extension worsen slightly (by -5.3°), though that drop wasn't statistically huge.
• The Takeaway: The mechanical help from the stick did not translate into better results. In fact, holding the stretch still on the mat was the superior strategy for the hips.

2. The Static Group Also Won the "Neck Twist"
The mat group also saw a nice improvement in cervical rotation (turning the head), gaining +5.4°. The stick group? They barely moved, gaining only +0.6°, which wasn't a real change.

3. The "Gate Closing" Effect
Here is the weird part. While some joints opened up, others actually got stiffer. Both groups saw a reduction in how far they could move their shoulders (horizontal flexion and adduction/abduction) and their hips (flexion).

• What this suggests: The authors suspect that pushing so hard (into that "tolerable pain" zone) might have triggered a protective response in the body. It's like the gate's hinges got scared of the force and clamped down tighter to protect themselves. This suggests that while high-intensity training works for some moves, it might be risky for others in older adults.

The Numbers Don't Lie (But They Are Careful)

The study involved 87 women in the stick group and 98 women in the mat group.

• Hip Extension: The difference between the two groups was clear. After adjusting for where they started, the mat group was still ahead with a statistical "p" value of 0.002. That's a very strong signal that the mat method really did work better for the hips.
• Neck Rotation: The mat group's gain of +5.4° was also a solid win (p < 0.001).

What This Means (And What It Doesn't)

The paper is very clear about what it rules out: It explicitly argues against the idea that using a stick to mechanically assist a stretch is better than just holding a static stretch. The "helper" tool didn't help; in fact, the simple, still method won.

However, the authors are also careful about what they don't know.

• They suggest that the high intensity might have caused the shoulder and hip flexion to get worse, but they didn't measure the "why" directly.
• They caution that these results are "preliminary." Because this wasn't a perfectly randomized experiment (people chose their groups based on how the program was run), and because there was no "do nothing" control group, we can't say this is a 100% proven fact for everyone.
• They did not test if these women actually fell less or could walk better in real life. They only measured the angles of the joints.

The Bottom Line

If you want to open up your hip and neck joints after 16 weeks of hard work, holding a still stretch on a mat seems to be the winner over using a stick to push you. But be careful: if you push too hard, too fast, your body might decide to lock up your shoulders and hips instead of opening them.

The study shows that for older women, sometimes the best way to oil the hinges is to hold the gate open gently but firmly, rather than trying to force it open with a lever. But because the study had some limitations (like only including women and not being a perfect random experiment), the authors say we need more research to be absolutely sure.