DavidPT40
Contributor
It takes 5 to 7 days of no training before you begin losing running performance.
any runners?
- Thread starter littlewaywelt
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
prthd9
Contributor
If you post the type of diving you plan on doing you may get a little more help on this board. Things like planned depth, length, will you be surface swimming or boat diving, etc.
Dr Deco
Contributor
- Messages
- 2,384
- Reaction score
- 96
- # of dives
- I just don't log dives
Hello readers:
Exercise and NASA
In the NASA studies, I examined the effect of exercise during the decompression phase and during the pre-decompression phase. Within a couple of hours prior to depressurization, exercise was found to be a deleterious quantity as concerns DCS. [Ref 5]. This we attributed to micronuclei generation, but there is not any proof that this is the mechanism.
Light Exercise During Decompression
If it is not too strenuous, exercise during decompression will increase tissue blood flow and promote nitrogen washout. [Ref. 10]. This is beneficial to divers.
Exercise and Bubble Formation
While exercise as a negative effect when decompressing to altitude [equivalent to a saturation-excursion dive], it does not appear to be the case when diving. This is probably because bottom pressure will eliminate any large bubble nuclei generated by the prior exercise. Considerable work has been performed concerning altitude depressurization because of its association with astronauts and extravehicular activity. In particular are the relationships of activity levels during the low-pressure [decompression] phase of the activity.
In 1989, I hypothesized that the reason decompression sickness was observed in ground-based tests of astronaut decompression procedures and not in null gravity was the reduction in number of tissue micronuclei in space because of the reduced musculoskeletal activity. Prior to this hypothesis, only exercise effects while on the bottom were considered.
Exercise Prior to Decompression
The NASA work generated considerable interest in the hyperbaric research community. By serendipity, work has been focus in depressurization and exercise separated by many hours. Curiously, it has been found that this type of predive exercise is a mitigating factor for DCS. [Ref. 2, 3, 8, 9, 11, 14].
Nitric oxide has been implicated as playing a role [Ref. 12, 13]. A recent study also indicates that hyperbaric oxygen several hours before a dive is beneficial. [Ref. 4].
Dr Deco :doctor:
References :book3:
1. Berge VJ, Jorgensen A, Loset A, Wisloff U, Brubakk AO. Exercise ending 30 min pre-dive has no effect on bubble formation in the rat. Aviat Space Environ Med. 2005 Apr;76(4):326-8.
2: Blatteau J, Boussuges A, Gempp E, Pontier JM, Castagna O, Galland FM, Robinet C, Bourdon L. Hemodynamic changes induced by sub-maximal exercise prior to a dive and its consequences on bubble formation.
Br J Sports Med. 2006 Nov 30;
3: Blatteau JE, Gempp E, Galland FM, Pontier JM, Sainty JM, Robinet C. Aerobic exercise 2 hours before a dive to 30 msw decreases bubble formation after decompression. Aviat Space Environ Med. 2005 Jul;76(7):666-9.
4. Butler BD, Little T, Cogan V, Powell MR. Hyperbaric oxygen pre-breathe modifies the outcome of decompression sickness.Undersea Hyperb Med. 2006 Nov-Dec;33(6):407-17
5: Dervay JP, Powell MR, Butler B, Fife CE. The effect of exercise and rest duration on the generation of venous gas bubbles at altitude. Aviat Space Environ Med. 2002 Jan;73(1):22-7.
6: Dujic Z, Palada I, Valic Z, Duplancic D, Obad A, Wisloff U, Brubakk AO. Exogenous nitric oxide and bubble formation in divers.Med Sci Sports Exerc. 2006 Aug;38(8):1432-5.
7: Dujic Z, Obad A, Palada I, Ivancev V, Valic Z. Venous bubble count declines during strenuous exercise after an open sea dive to 30 m.Aviat Space Environ Med. 2006 Jun;77(6):592-6.
8: Dujic Z, Palada I, Obad A, Duplancic D, Bakovic D, Valic Z. Exercise during a 3-min decompression stop reduces postdive venous gas bubbles. Med Sci Sports Exerc. 2005 Aug;37(8):1319-23.
9. Dujic Z, Duplancic D, Marinovic-Terzic I, Bakovic D, Ivancev V, Valic Z, Eterovic D, Petri NM, Wisloff U, Brubakk AO. Aerobic exercise before diving reduces venous gas bubble formation in humans. J Physiol. 2004 Mar 16;555(Pt 3):637-42. Epub 2004 Jan 30.
10. Jankowski LW, Tikuisis P, Nishi RY. Exercise effects during diving and decompression on postdive venous gas emboli. Aviat Space Environ Med. 2004 Jun;75(6):489-95.
11. Loset A Jr, Mollerlokken A, Berge V, Wisloff U, Brubakk AO. Post-dive bubble formation in rats: effects of exercise 24 h ahead repeated 30 min before the dive. Aviat Space Environ Med. 2006 Sep;77(9):905-8.
12. Wisloff U, Richardson RS, Brubakk AO. Exercise and nitric oxide prevent bubble formation: a novel approach to the prevention of decompression sickness? J Physiol. 2004 Mar 16;555(Pt 3):825-9. Epub 2004 Jan 14.
13. Wisloff U, Richardson RS, Brubakk AO. NOS inhibition increases bubble formation and reduces survival in sedentary but not exercised rats. J Physiol. 2003 Jan 15;546(Pt 2):577-82.
14. Wisloff U, Brubakk AO. Aerobic endurance training reduces bubble formation and increases survival in rats exposed to hyperbaric pressure.
J Physiol. 2001 Dec 1;537(Pt 2):607-11.
The next class in Decompression Physiology for 2007 is August 18-19. :1book:
This class is at the USC campus in Los Angeles.
http://wrigley.usc.edu/hyperbaric/advdeco.htm
Exercise and NASA
In the NASA studies, I examined the effect of exercise during the decompression phase and during the pre-decompression phase. Within a couple of hours prior to depressurization, exercise was found to be a deleterious quantity as concerns DCS. [Ref 5]. This we attributed to micronuclei generation, but there is not any proof that this is the mechanism.
Light Exercise During Decompression
If it is not too strenuous, exercise during decompression will increase tissue blood flow and promote nitrogen washout. [Ref. 10]. This is beneficial to divers.
Exercise and Bubble Formation
While exercise as a negative effect when decompressing to altitude [equivalent to a saturation-excursion dive], it does not appear to be the case when diving. This is probably because bottom pressure will eliminate any large bubble nuclei generated by the prior exercise. Considerable work has been performed concerning altitude depressurization because of its association with astronauts and extravehicular activity. In particular are the relationships of activity levels during the low-pressure [decompression] phase of the activity.
In 1989, I hypothesized that the reason decompression sickness was observed in ground-based tests of astronaut decompression procedures and not in null gravity was the reduction in number of tissue micronuclei in space because of the reduced musculoskeletal activity. Prior to this hypothesis, only exercise effects while on the bottom were considered.
Exercise Prior to Decompression
The NASA work generated considerable interest in the hyperbaric research community. By serendipity, work has been focus in depressurization and exercise separated by many hours. Curiously, it has been found that this type of predive exercise is a mitigating factor for DCS. [Ref. 2, 3, 8, 9, 11, 14].
Nitric oxide has been implicated as playing a role [Ref. 12, 13]. A recent study also indicates that hyperbaric oxygen several hours before a dive is beneficial. [Ref. 4].
Dr Deco :doctor:
References :book3:
1. Berge VJ, Jorgensen A, Loset A, Wisloff U, Brubakk AO. Exercise ending 30 min pre-dive has no effect on bubble formation in the rat. Aviat Space Environ Med. 2005 Apr;76(4):326-8.
2: Blatteau J, Boussuges A, Gempp E, Pontier JM, Castagna O, Galland FM, Robinet C, Bourdon L. Hemodynamic changes induced by sub-maximal exercise prior to a dive and its consequences on bubble formation.
Br J Sports Med. 2006 Nov 30;
3: Blatteau JE, Gempp E, Galland FM, Pontier JM, Sainty JM, Robinet C. Aerobic exercise 2 hours before a dive to 30 msw decreases bubble formation after decompression. Aviat Space Environ Med. 2005 Jul;76(7):666-9.
4. Butler BD, Little T, Cogan V, Powell MR. Hyperbaric oxygen pre-breathe modifies the outcome of decompression sickness.Undersea Hyperb Med. 2006 Nov-Dec;33(6):407-17
5: Dervay JP, Powell MR, Butler B, Fife CE. The effect of exercise and rest duration on the generation of venous gas bubbles at altitude. Aviat Space Environ Med. 2002 Jan;73(1):22-7.
6: Dujic Z, Palada I, Valic Z, Duplancic D, Obad A, Wisloff U, Brubakk AO. Exogenous nitric oxide and bubble formation in divers.Med Sci Sports Exerc. 2006 Aug;38(8):1432-5.
7: Dujic Z, Obad A, Palada I, Ivancev V, Valic Z. Venous bubble count declines during strenuous exercise after an open sea dive to 30 m.Aviat Space Environ Med. 2006 Jun;77(6):592-6.
8: Dujic Z, Palada I, Obad A, Duplancic D, Bakovic D, Valic Z. Exercise during a 3-min decompression stop reduces postdive venous gas bubbles. Med Sci Sports Exerc. 2005 Aug;37(8):1319-23.
9. Dujic Z, Duplancic D, Marinovic-Terzic I, Bakovic D, Ivancev V, Valic Z, Eterovic D, Petri NM, Wisloff U, Brubakk AO. Aerobic exercise before diving reduces venous gas bubble formation in humans. J Physiol. 2004 Mar 16;555(Pt 3):637-42. Epub 2004 Jan 30.
10. Jankowski LW, Tikuisis P, Nishi RY. Exercise effects during diving and decompression on postdive venous gas emboli. Aviat Space Environ Med. 2004 Jun;75(6):489-95.
11. Loset A Jr, Mollerlokken A, Berge V, Wisloff U, Brubakk AO. Post-dive bubble formation in rats: effects of exercise 24 h ahead repeated 30 min before the dive. Aviat Space Environ Med. 2006 Sep;77(9):905-8.
12. Wisloff U, Richardson RS, Brubakk AO. Exercise and nitric oxide prevent bubble formation: a novel approach to the prevention of decompression sickness? J Physiol. 2004 Mar 16;555(Pt 3):825-9. Epub 2004 Jan 14.
13. Wisloff U, Richardson RS, Brubakk AO. NOS inhibition increases bubble formation and reduces survival in sedentary but not exercised rats. J Physiol. 2003 Jan 15;546(Pt 2):577-82.
14. Wisloff U, Brubakk AO. Aerobic endurance training reduces bubble formation and increases survival in rats exposed to hyperbaric pressure.
J Physiol. 2001 Dec 1;537(Pt 2):607-11.
The next class in Decompression Physiology for 2007 is August 18-19. :1book:
This class is at the USC campus in Los Angeles.
http://wrigley.usc.edu/hyperbaric/advdeco.htm
OP
littlewaywelt
Registered
Thanks very much for all the info here. Just thought I'd post what I ended up doing.
5-7 days doesn't seem like much, but I have very specific training cycles designed to peak at certain times of the year. If I skip a week or move my schedule a week it affects everything till November. I follow a 3 week on, 4th week rest/recovery cycle with several periods, each period being anywhere from 1-2 cycles to 4 cycles in length. The common wisdom currently is not 5-7 days, but about 1% per day.
Not wanting to take any chances, I ended up cutting out all my medium & long runs which are the most important (missing 1 makes a difference) and after my open water dives, I ended up deciding to only do 1 dive ~70ft per day and dive every other day, getting my runs in on the off dive days. I only got in 3 dives after the 4 ow cert dives, but I was able to not completely drop the running. It wasn't ideal for either activity, but I feel like I did both safely.
Being such a novice diver I didn't feel like taking any chances.
I really enjoyed the dives and they all went very well. All of the prereading here really helped. I felt neut boyant and completely at ease during all the dives.
5-7 days doesn't seem like much, but I have very specific training cycles designed to peak at certain times of the year. If I skip a week or move my schedule a week it affects everything till November. I follow a 3 week on, 4th week rest/recovery cycle with several periods, each period being anywhere from 1-2 cycles to 4 cycles in length. The common wisdom currently is not 5-7 days, but about 1% per day.
Not wanting to take any chances, I ended up cutting out all my medium & long runs which are the most important (missing 1 makes a difference) and after my open water dives, I ended up deciding to only do 1 dive ~70ft per day and dive every other day, getting my runs in on the off dive days. I only got in 3 dives after the 4 ow cert dives, but I was able to not completely drop the running. It wasn't ideal for either activity, but I feel like I did both safely.
Being such a novice diver I didn't feel like taking any chances.
I really enjoyed the dives and they all went very well. All of the prereading here really helped. I felt neut boyant and completely at ease during all the dives.
