Muscles Remember Training and a Black Hole Made a Star Explode
Curiosity Weekly
Warner Bros. Discovery
4.6 • 963 Ratings
🗓️ 12 October 2021
⏱️ 11 minutes
🧾️ Download transcript
Summary
Learn how quickly previously trained muscles bounce back after inactivity; and how a black hole made a star explode.
Previously trained muscles bounce back after inactivity by Grant Currin
- Seaborne, R. A., Strauss, J., Cocks, M., Shepherd, S., O’Brien, T. D., van Someren, K. A., Bell, P. G., Murgatroyd, C., Morton, J. P., Stewart, C. E., & Sharples, A. P. (2018). Human Skeletal Muscle Possesses an Epigenetic Memory of Hypertrophy. Scientific Reports, 8(1). https://doi.org/10.1038/s41598-018-20287-3
- Prior training can accelerate muscle growth even after extended idleness. (2021, August 18). EurekAlert! https://www.eurekalert.org/news-releases/925769
- Wen, Y., Dungan, C. M., Mobley, C. B., Valentino, T., von Walden, F., & Murach, K. A. (2021). Nucleus Type-Specific DNA Methylomics Reveals Epigenetic “Memory” of Prior Adaptation in Skeletal Muscle. Function, 2(5). https://doi.org/10.1093/function/zqab038
- Episode about previous research: https://www.curiositydaily.com/individuals-really-can-slow-climate-change-muscle-memory-is-real-and-penguin-waddles/
A black hole collided with a star and made it explode in a merger-triggered supernova by Briana Brownell
- Dong, D. Z., Hallinan, G., Nakar, E., Ho, A. Y. Q., Hughes, A. K., Hotokezaka, K., Myers, S. T., De, K., Mooley, K. P., Ravi, V., Horesh, A., Kasliwal, M. M., & Kulkarni, S. R. (2021). A transient radio source consistent with a merger-triggered core collapse supernova. Science, 373(6559), 1125–1129. https://doi.org/10.1126/science.abg6037
- Stellar collision triggers supernova explosion. (2021, September 2). EurekAlert! https://www.eurekalert.org/news-releases/927166
- A Black Hole Triggers a Premature Supernova – First Observation of a Brand-New Kind of Supernova. (2021, September 5). A Black Hole Triggers a Premature Supernova – First Observation of a Brand-New Kind of Supernova. SciTechDaily. https://scitechdaily.com/a-black-hole-triggers-a-premature-supernova-first-observation-of-a-brand-new-kind-of-supernova/
- Plait, P. (2021, September 6). So, a star may have eaten a black hole and exploded. SYFY WIRE; SYFY WIRE. https://www.syfy.com/syfywire/so-a-star-may-have-eaten-a-black-hole-and-exploded
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Transcript
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| 0:00.0 | Hi, you're about to get smarter in just a few minutes with Curiosity Daily from |
| 0:04.9 | Curiosity.com. I'm Cody Gough. And I'm Ashley Hamer. Today you learn about how |
| 0:09.3 | quickly previously trained muscles bounce back after inactivity and how a black hole made a |
| 0:14.9 | star literally explode. Let's literally satisfy some curiosity. |
| 0:20.0 | It's hard to start working out, but it is incredibly easy to stop. |
| 0:27.0 | Just ask your average ex-high school athlete, or a person who, I don't know, has lived through a pandemic or me specifically. |
| 0:35.8 | Well here's the good news. |
| 0:37.8 | It's a lot easier to build muscles you once had than it is to train for the first time and researchers in Arkansas |
| 0:45.6 | have uncovered a little bit more about why that's the case. In the last few years |
| 0:51.1 | researchers have made some exciting discoveries about this phenomenon. |
| 0:55.0 | Like, a study in 2018 had men undergo a grueling resistance training program |
| 1:01.0 | and then stop for a few weeks and then start their workouts again. |
| 1:05.3 | Researchers biopsied their muscles and they found that certain locations on their DNA |
| 1:10.3 | were marked with chemical tags that determined how they were expressed. |
| 1:15.0 | And those tags seemed to help them get stronger, faster the second time around. |
| 1:21.0 | But the method those researchers used was pretty general. There was no way to know |
| 1:26.0 | whether the DNA they were looking at came from the specialized nuclei-f muscle cells or from cells outside the muscle. |
| 1:34.0 | So these Arkansas researchers decided to zoom in directly on muscle DNA. |
| 1:39.5 | And for that they used mice. |
| 1:42.1 | For the experiments, one group of mice spent eight weeks training on a wheel |
| 1:46.8 | and then took about three months off. After the break, it went back on the wheel, |
| 1:51.9 | but this time more mice joined in. The second group |
... |
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