Members
 Register


Rules | Articles | Arcade | Members List

 
Go Back   Bodybuilding Dungeon > Nutrition / Training > Training
 

Reply
 
LinkBack Thread Tools
Math For Dumbbells
Old 07-31-2005, 06:40 PM   #1
StayBig
Banned

 
StayBig's Avatar
 
Join Date: Jun 2005
Location: Planet Muscle
Posts: 897
Rep Power: 0StayBig is an unknown quantity at this point

StayBig is offline
  Reply With Quote

It's kinda a joke, I hope you get it. Anyways, do you guyz (gals) know the conversions for dumbbells. For example. If I am benching with 100lb. dumbbells on the flat bench, does that equivalete to 220lb.s I'm pretty sure that the dumbbells add an extra twenty lbs. to whatever exercise that your doing. Is this correct.

Furthermore, are they all the same, incline, decline, flat, seated dumbbell shoulder press and dumbbell rows? Thanks geniuses. Einsteins.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by StayBig
 
 
Old 07-31-2005, 06:54 PM   #2
StayBig
Banned

 
StayBig's Avatar
 
Join Date: Jun 2005
Location: Planet Muscle
Posts: 897
Rep Power: 0StayBig is an unknown quantity at this point

StayBig is offline
  Reply With Quote

...Bump
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by StayBig
 
 
Old 07-31-2005, 07:13 PM   #3
Dogg
NPC Lightweight
 
Join Date: Jun 2005
Location: Canada
Posts: 36
Rep Power: 0Dogg is an unknown quantity at this point

Dogg is offline
  Reply With Quote

You might need to clarify what you are asking.

When using dumbells the weight is going to be perceived as being heavier than it actually is because there is some instability that comes into play, so your brain makes it feel heavier.

If that's what you are refering to then it would not be the same for all exercises. It would all depend on how much perceived stability is added by using the barbell instead.

On the other hand, if you're talking about the handle's of the dumbells not being included in the weight that is labelled on them then it all depends on how the dumbells are manufactured. Some would include this weight, some wouldn't.

In the end it really doesn't matter, dumbell exercises don't replace barbell exercises, and if something is too heavy/light then change it up for the next set.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Send a private message to Dogg Find More Posts by Dogg
 
 
Old 07-31-2005, 07:26 PM   #4
StayBig
Banned

 
StayBig's Avatar
 
Join Date: Jun 2005
Location: Planet Muscle
Posts: 897
Rep Power: 0StayBig is an unknown quantity at this point

StayBig is offline
  Reply With Quote

Well, I kinda agree and disagree. I use dumbbells at home and the bar itself with the clips weighs 5 lbs. so I always add that, so 4 10lb. plates (2 on each side) would come out to a 45lb. dumbbell. But what I'm saying is. I have pretty much figured out that dumbbells add 20 lbs. to the barbell, (10lbs. each side.) A good explanation would be that my max is 180lbs. on the flat barbell bench press. So I have maxed out with 80lb. dumbbells on the flat bench. That comes out to 160lbs., so I am adding 20lbs. becuase that is what my max is plus my friend has noticed the same thing. So I'm just asking if you or anyone else have noticed this 20lbs. As for rows, you're probably right it could be more or less because I can do 12 good reps with 155lbs. on the barbell for rows, but with one arm db rows I can do 80lbs. for a good 10 reps. Which would be 180lbs. if you added the 20. So I'm guessing this only applies to incline, decline and flat benching. In theory when I do barbell shoulder presses (seated,) I can do 120lbs. for about 6 reps. When I use the dumbbells I can do 55lb. dumbbells for 6 reps which would come out to 130lbs. if you added the twenty. So I'm confused as to why the dumbbells are easier than the barbell on the shoulder press but not the bench. I know that this is a lot to read, but if someone knows what I'm talking about, give a post and we can discuss more. I'm just guessing this applies to benching only? And thanks for reading.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by StayBig
 
 
Old 07-31-2005, 07:27 PM   #5
StayBig
Banned

 
StayBig's Avatar
 
Join Date: Jun 2005
Location: Planet Muscle
Posts: 897
Rep Power: 0StayBig is an unknown quantity at this point

StayBig is offline
  Reply With Quote

Oh, and just as a side note Dogg, I have replaced the barbell with dumbbells for every exercise I do, I just fell that it gives a better workout and puts less stress on your joints. Just my opinion though. Maybe barbells work better for others.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by StayBig
 
 
Old 07-31-2005, 11:37 PM   #6
Q80_MuscleHed
Banned
 
Join Date: Apr 2005
Posts: 8,209
Rep Power: 0Q80_MuscleHed is an unknown quantity at this point

Q80_MuscleHed is offline
  Reply With Quote

did u mean that your benching more in dumbells than barbell ?
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by Q80_MuscleHed
 
 
Old 07-31-2005, 11:49 PM   #7
eli80cal
Banned

 
eli80cal's Avatar
 
Join Date: May 2005
Location: Arizona
Age: 27
Posts: 585
Rep Power: 0eli80cal is an unknown quantity at this point

eli80cal is offline
  Reply With Quote

Stay big-----Not sure of the exact conversion, but yeah, you can always lift more on a barbell movement than a dumbell. With dumbell bench, both arms have to work individually, and allthe stabilizer muscles must work more also. When you switch to barbell, there is only one item to focus on, its more stable, etc. This also holds true for other things, like how you can do lateral raises with more weight if you do one arm at a time. etc. I dont think there is any conversion factor that would be constant from person to person. With dumbells to, you have to factor in the taking them off the rack, to your thighs, to starting position.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by eli80cal
 
 
Old 07-31-2005, 11:51 PM   #8
eli80cal
Banned

 
eli80cal's Avatar
 
Join Date: May 2005
Location: Arizona
Age: 27
Posts: 585
Rep Power: 0eli80cal is an unknown quantity at this point

eli80cal is offline
  Reply With Quote

Quote:
Originally Posted by StayBig
. on the barbell for rows, but with one arm db rows I can do 80lbs. for a good 10 reps. Which would be 180lbs. if you added the 20.
One arm exercises would be the same as a barbell exercise, as there is only one item fo rth ebody to stabilize and focus on.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by eli80cal
 
 
Old 08-01-2005, 01:47 AM   #9
Q80_MuscleHed
Banned
 
Join Date: Apr 2005
Posts: 8,209
Rep Power: 0Q80_MuscleHed is an unknown quantity at this point

Q80_MuscleHed is offline
  Reply With Quote

same thing to me .. i can do 10 reps by 100 kilo barbell row but with one arm dumbell i do more than 10 reps ..
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by Q80_MuscleHed
 
 
Old 08-02-2005, 06:57 PM   #10
StayBig
Banned

 
StayBig's Avatar
 
Join Date: Jun 2005
Location: Planet Muscle
Posts: 897
Rep Power: 0StayBig is an unknown quantity at this point

StayBig is offline
  Reply With Quote

I don't know if you guys understand what I am saying. I'll try to explain it as easily as possible.

Lets say that you max out on the flat barbell bench press with 200lbs. Then you would max out with 90lb. dumbbells on the flat bench press. So I have noticed this with me, so I added 20lbs. to the total of the dumbbells weight. So if I never use a barbell again, I will know where I stand by using dumbbells and adding twenty lbs. Now you might think that maybe their is a percentage ratio that comes into play.. example being that the heavier the dumbbells get, the harder the weight becomes and it could be more than adding just 20lbs. However, my friend can bench press 275lbs. for a good 8 reps, with the dumbbells he can do 125lb. dumbbells for 8 reps. Which would come out to 270lbs. pretty much if you added the twenty.

So my question is..

a.) do you guys notice this, and how much weight do you add on top of the dumbbells total weight to figure out what your actually benching if it were on the barbell

b.) have you noticed that you can seated shoulder press more with dumbbells thatn what you normally could a barbell

c.) do other exercises have different lbs. added to them, like one arm db rows for example, I can do WAY more than what I could with the barbell

and Eli also said that it's easier to do side laterals with one arm at a time, but I find it easier to do it with both arms simultaneously (together?)

I think this is a good argument, and someone please jump in if you know what I'm talking about. Thanks.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Find More Posts by StayBig
 
 
Old 10-05-2005, 11:43 PM   #11
dirtypool
NPC Lightweight
 
Join Date: Sep 2005
Age: 22
Posts: 17
Rep Power: 0dirtypool is an unknown quantity at this point

dirtypool is offline
  Reply With Quote

there's no magic formula staybig, that's ridiculous. generally people can't put up as much weight on the "same" exercise using DBs as they can with a barbell, true...but as far as adding twenty lbs it's different for everyone. For example, some people may have stronger stablizer muscles than others or have anatomical problems with the way they're forced to do the exercise with a barbell. I'm sure there are several factors that could throw off your "formula". If there was a perfect formula to figure it out, it's much more likely it would be a ratio (180 is 90% of 200, while 230 is 92% of 250, 280 is 93% of 300) and not barbell=dumbbells+20. btw I do sets of 10 with 80lb DBs on flat bench, and last time I checked the most I could get up with a barbell for ten reps was 155
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Send a private message to dirtypool Find More Posts by dirtypool
 
 
Old 10-07-2005, 11:26 AM   #12
Spyder17
NPC Lightweight
 
Join Date: Sep 2005
Location: Richmond VA
Posts: 8
Rep Power: 0Spyder17 is an unknown quantity at this point

Spyder17 is offline
  Reply With Quote

It depends on the exercise. For me it's a very small percentage for say, Shoulder Pressing movements when compared to say, rowing movements.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Send a private message to Spyder17 Find More Posts by Spyder17
 
 
Old 10-07-2005, 11:27 AM   #13
Spyder17
NPC Lightweight
 
Join Date: Sep 2005
Location: Richmond VA
Posts: 8
Rep Power: 0Spyder17 is an unknown quantity at this point

Spyder17 is offline
  Reply With Quote

On the other hand, i count my dumbell movements as a separate exercise secondary to the barbell movement. For example, i'd do BB bench AND DB bench, not either/or. I don't overtrain or anything, that's just a simple way of putting it.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Send a private message to Spyder17 Find More Posts by Spyder17
 
 
Old 10-09-2005, 01:41 PM   #14
Linden84
NPC Lightweight
 
Join Date: Aug 2005
Location: Sweden
Age: 24
Posts: 4
Rep Power: 0Linden84 is an unknown quantity at this point

Linden84 is offline
  Reply With Quote

I think it's different for everyone. I can do 8 reps at 45 kg (100 lb) flat dumbell bench but only 7 reps at 90 kg (200 lb) barbell bench. So im actually stronger with the dumbells.

But i always have had a special liking for the dumbel bench. Maybe becaus i always have been stronger with the dumbells.
 
Add Post to del.icio.usBookmark Post in TechnoratiStumble this Post!Google Bookmark this Post!Yahoo Bookmark this Post!Live Bookmark this Post!

View Public Profile Send a private message to Linden84 Find More Posts by Linden84