Image: NASA's Dr. Michael Duncan
Martin Mejia  /  AP
Dr. Michael Duncan, NASA's deputy chief medical officer, left, accompanied by other experts, speaks during a press conference outside San Jose mine in Copiapo, Chile, on Friday.
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updated 9/3/2010 9:00:17 PM ET 2010-09-04T01:00:17

A team of NASA doctors and engineers recommended Friday that Chilean authorities regulate the day-and-night sleep patterns of 33 trapped miners, boost their Vitamin D intake and phase in an exercise program as their nutrition improves.

The NASA team is in Chile to help rescuers develop plans for maintaining the health of miners, who have been buried nearly a half-mile underground since a mine collapse on Aug. 5. The miners organized themselves and rationed food for more than two weeks until they were discovered alive on Aug. 22.

Since then, the miners have been receiving food, water and medicine through three bore-holes.

The NASA team, which spoke at a news conference late Friday, said regulating sleep patterns requires establishing a "lighted community area" that is always lit and a "dark sleeping area" that is always shuttered. Regulating the time the miners eat and exercise would help them get in a pattern, NASA experts said.

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Geologists and engineers are working to open a rescue shaft to the workers, but the government has said it could take up to four months to drill the hole. Possible alternative plans, set to get under way over the next week, could be faster.

The team leader, Dr. Michael Duncan, said he is impressed by how Chilean rescuers are maintaining the men in the meantime and preparing them for what will be a harrowing rescue.

"They are basically writing the book on how to rescue this many people this deep and underground for so long," Duncan said.

Underscoring the unprecedented nature of the rescue, Duncan said the protective cages that will be used to bring the men up must be specially made, and his team will participate in the design.

The miners are also getting support from a group of former rugby players who survived more than two months of isolation in the Andes four decades ago.

Ramon Sabella, Pedro Alcorta, Jose Inciarte and Gustavo Servino were among 16 Uruguayans who survived a plane crash in the snow-covered peaks and waited 72 days to be rescued. Some were forced to eat the flesh of friends killed in the crash to stay alive.

The four ex-players arrived Friday in the Chilean capital, Santiago, and met with President Sebastian Pinera.

Sabella said the group would visit the San Jose mine in the northern town of Copiapo on Saturday to deliver a message of hope and support from Uruguayan children.

Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Photos: Chilean mine collapse

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  1. Carlos Galleguillos and Tabita Galleguillos, relatives of trapped miner Jorge Galleguillos, wait for news outside the San Jose Mine near Copiapo, Chile, on Monday, Oct. 11. The engineer leading Chilean rescue efforts, Andres Sougarett, said Monday his team successfully tested a rescue capsule nearly all the way down to where 33 miners are trapped. (Natacha Pisarenko / AP) Back to slideshow navigation
  2. Drill operators Jeff Hart, left, and James Staffel, both U.S. citizens, wave as the drill that made the hole reaching the miners is transported away from the mine on Monday. (Jorge Saenz / AP) Back to slideshow navigation
  3. Surrounded by media crews, onlookers and mine staff, the main rescue drill leaves the mine on Monday. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  4. Rescuers test a capsule similiar to the one that will be used to recover the trapped miners at the San Jose mine near Copiapo, Chile, on Sunday, Oct. 10. (Hugo Infante / AFP - Getty Images) Back to slideshow navigation
  5. A relative of one of the miners is hugged by a policeman after the drilling machine completed an escape hole at the mine on Oct. 9. (Ivan Alvarado / Reuters) Back to slideshow navigation
  6. Workers of the T-130 drill celebrate in the arid Atacama desert on Oct. 9. The crew drilling with the T-130 drill, part of an effort dubbed "Plan B" - one of three shafts attempting to reach 33 miners trapped deep underground - finally made contact with the miners' shelter. (Francesco Degasperi / AFP - Getty Images) Back to slideshow navigation
  7. A clown named Rolly shows a flag that was sent by the 33 trapped miners as a gift at the camp where relatives wait for news outside the San Jose mine in Copiapo, Chile, on Wednesday, Oct. 6. The words on the flag read in Spanish, "A souvenir for clown Rolly, from the San Jose mine, thanks for making our children laugh." Thirty-three miners have been trapped deep underground in the copper and gold mine since it collapsed on Aug. 5. (Natacha Pisarenko / AP) Back to slideshow navigation
  8. A helmet sits on a rock covered with the names of the 33 miners trapped in the collapsed San Jose mine. (Natacha Pisarenko / AP) Back to slideshow navigation
  9. Aurelia Navarro, a volunteer missionary, prays on Oct. 5 during a small ceremony marking the 60 days since miners became trapped. (Dario Lopez-mills / AP) Back to slideshow navigation
  10. A relative of one of the trapped miners writes a message on a Chilean national flag on Oct. 4. (Martin Bernetti / AFP - Getty Images) Back to slideshow navigation
  11. A team tests a possible rescue capsule designed by the Chilean Army's Shipyards on Sept. 30. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  12. Workers on Sept. 30 test a capsule that will be used to rescue trapped miners. (Chile's Presidency via AP) Back to slideshow navigation
  13. A worker checks part of a drill pulled from Rigg 421 on Sept. 24 at the San Jose mine near Copiapo, Chile, where 33 miners remain trapped. (Ivan Alvarado / AFP - Getty Images) Back to slideshow navigation
  14. Children play Oct. 2 as a worker hangs a sign identifying a module to be used as school room for relatives of the trapped Chilean miners trapped. Many of the families of the miners are living in what is called "Camp Esperanza" or "Camp Hope." (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  15. Relatives of the trapped miners watch a video of them at the San Jose mine on Saturday, Sept. 18. (Aliosha Marquez A / AP) Back to slideshow navigation
  16. A crane lifts a capsule that will be used as part of rescue operation for the miners at the San Jose copper and gold mine on Saturday, Sept. 25. (Ivan Alvarado / Reuters) Back to slideshow navigation
  17. Nelly Bugueno, mother of trapped miner Victor Zamora, checks her cell phone as she walks past the tents where families of the 33 trapped miners are living as they await rescue on Friday. (Stringer/chile / Reuters) Back to slideshow navigation
  18. Jesica Cortez, wife of Victor Zamora, one of the 33 miners trapped down in the shaft, rejoices as she reads a letter from her husband, at San Jose mine, near Copiapo, 800 km north of Santiago, on Wednesday, Sept. 18. (Martin Bernetti / AFP - Getty Images) Back to slideshow navigation
  19. Relatives of trapped miners Claudio Yanez and Dario Segovia write a message to them with painted stones outside the San Jose mine in Copiapo, Chile, Thursday, Sept. 23. (Photographer: Aliosha Marquez A / AP) Back to slideshow navigation
  20. Members of a folkloric ballet perform at the camp where relatives of trapped miners wait for news outside the San Jose mine in Copiapo, Chile, Wednesday Sept. 1. Thirty-three miners have been trapped alive deep underground in the copper and gold mine since it collapsed on Aug. 5. (Roberto Candia / AP) Back to slideshow navigation
  21. A composite image captured from a video on Tuesday, Sept. 1 shows four of 33 trapped miners waving at mine San Jose, near of Copiapo, Chile. (Codelco / Handout / EPA) Back to slideshow navigation
  22. A sample of what it will be the first hot meal the miners still trapped in the San Jose Mine will have since the accident, Tuesday, Sept. 1 near Copiapo, Chile. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  23. Evangelic Minister Javier Soto dedicates one of the 33 mini-bibles that will be given to the miners trapped in the San Jose mine, Monday. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  24. View of 33 Chilean national flags placed outside the San Jose mine by the relatives of the 33 trapped miners in Copiapo, 800 km north of Santiago on Monday. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  25. A worker checks the drill machine digging an escape hole for the 33 miners trapped underground in a copper and gold mine at Copiapo, north of Santiago, Chile, on Monday, Aug. 30. (Ivan Alvarado / Reuters) Back to slideshow navigation
  26. Work to rescue the trapped miners continues on Aug. 30 at the mine, which is located 450 miles north of Santiago. (Ivan Alvarado / Reuters) Back to slideshow navigation
  27. Samuel Avalo, left, and his wife Herminda Acuna, parents of Samuel Avalo Acuna, one of the trapped miners, sit outside the San Jose mine in Copiapo, on Aug. 30. (Roberto Candia / AP) Back to slideshow navigation
  28. Relatives of miners carry candles during a vigil outside the mine on Sunday, Aug. 29. (Roberto Candia / AP) Back to slideshow navigation
  29. Trapped miners wave at a camera from underground on Aug. 29. (Ivan Alvarado / Reuters) Back to slideshow navigation
  30. Chilean pianist Roberto Bravo performs during a show for the relatives of the trapped miners in Copiapo on Aug. 29. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  31. Relatives of those trapped underground in a copper and gold mine gather around a screen showing the miners inside the mine at Copiapo, north of Santiago, Chile, on Thursday, Aug. 26. (Ivan Alvarado / Reuters) Back to slideshow navigation
  32. Marion Gallardo, the granddaughter of trapped miner Mario Gomez, writes a letter to her grandfather on Wednesday, Aug. 25. The 33 miners trapped in the San Esteban gold and copper mine in Copiapo, north of Santiago, since Aug. 5 say they are "enduring hell" underground, putting urgency into the rescue operation. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
  33. A combined photo shows the 33 miners trapped in the mine in Copiapo, Chile. (Diario Atacama / Handout / EPA) Back to slideshow navigation
  34. Elias Sepulveda and her cousin Katherine embrace in front of a tribute to their relatives, Esteban Rojas and Pablo Rojas, two of the miners trapped in the collapsed mine. (Roberto Candia / AP) Back to slideshow navigation
  35. An officer stands in front of the machine that will be used to rescue the miners. The miners were trapped when the shaft they were working in collapsed. (Claudio Reyes / EPA) Back to slideshow navigation
  36. Relatives of the trapped miners wave to rescue workers outside the collapsed mine. Rescue teams bored a small hole down more than 2,000 feet and used a video camera to confirm the miners were alive on Aug. 22. (Roberto Candia / AP) Back to slideshow navigation
  37. Florencio Avalos, one of the trapped miners, is seen Aug. 23 in an image from video. The camera was lowered more than 2,000 feet into the copper and gold mine. (Reuters) Back to slideshow navigation
  38. Lilianette Ramirez, wife of trapped miner Mario Gomez, holds a letter from her husband outside the mine on Aug. 23. (Ivan Alvarado / Reuters) Back to slideshow navigation
  39. Relatives of trapped miners embrace after learning that the 33 miners were found alive Aug. 22. (Stringer/chile / Reuters) Back to slideshow navigation
  40. Chilean workers operate a drilling machine at the San Esteban gold and copper mine on Aug. 17. (Ariel Marinkovic / AFP - Getty Images) Back to slideshow navigation
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Gallery: Miner profiles, first moments of freedom

Read about each of the 33 miners as they are rescued.

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