So for 20mins of interval cardio how would you break it down in mins:MHR% ?
Matt
MHR%
I'm guessing is max heart rate
Well the first thing to do is to find your max heart rate in terms of your true performance level. For example, the # in which you can't talk and exercise at the same time or the moment when you feel your muscles are not responding well.
If you can't talk is a respiratory fatigue and if you can't move is muscular fatigue. Find your number at the type of fatigue that doesn't let you keep going. You said that with the DB swings you got to 85%. Do you think you can go higher or is that your limit. (for now)
For some of my clients the first week, 67% is the highest they can go. Then we work on getting better and after 3 weeks they can reach 83% of their max HR without feeling like they are going to die.
Using the formula is good, as a reference # but I don't like to use it to determine your limit. Also the max HR formula has a big error margin of +/-14. Some studies say 27 and some say 9. I've seen 14 so I use that #.
This means that if your max HR is 200 using the formula, you could have a true max HR of 214 or or 184. To me that is too big of a margin.
Find your HR limit and how long does it take you to get there. This could be because respiratory fatigue or muscle fatigue. Muscle fatigue is more common when using a bike or a stairmaster. You should try it just sprinting outside. It shouldn't be more than 1 minute. Is the # you feel that you can't go no more as fast as you can. Then walk for like 4 minutes because you will need it.
Most people get it at 45 seconds of sprinting but I've had some people that can get 110% max HR (according to the formula) after 2 minutes in swimming. Not athlete but a 35 year old asian man, I got scared the first time I saw that and then looked at the research.
Ok, so you have your HR max and how long does it take (work time)
The HR max is your goal at the last rep of your interval. The work time is the max time you can spend on a rep.
You decrease the time by 10 or 20 seconds of the time it takes you to get 100% true max HR. And now you have the time for your work intervals.
I use a minimum of 20 seconds and not more than 2 minutes for work reps. For rest reps I use a minimum of 10 seconds and a maximum of 4 minutes depending on the person.
Your rest intervals will be according to your level. Use a ratio format like this:
1 to 1 ratio = 30seconds of work and 30seconds of rest
1 to 2 ratio = 30seconds of work and 60seconds rest
1 to 3 ratio = 30seconds of work and 90seconds rest
you can use it for 45second work intervals or 1 minute work intervals
a 20min Interval Workout can look like this
2min warm-up 50% of true max HR or less
1st rep - 30 seconds of work (hard sprinting) 70% of true max HR
30 seconds rest (walking) bring your HR at least by 20beats per minute
2nd rep - 30 seconds work 80% true max HR
if you continue like this and add 2 to 3 minutes of cool down you will do like 16, 30second sprints in 20 minutes
Your HR will reach 99% after the rep # 6
Most people I know have to take longer rest periods and do 7 to 10 reps in 20 minutes. This is very challenging but allows you to know your body and how much work you can do. Your body will tell you how hard you can go.
This is why you don't need a special waver to take a spinning class. Because you decide how hard you want to work and your body will slow down using fatigue to tell you when to slow down.
You'll be surprised of what you can achieve. And the challenge becomes your motivation.
One last note. Your workout should not make you puke. If it does then you need a longer rest period. This is why I don't follow the max HR formula. Just follow your breathing and when you need to rest look at your HR. Even if you stop it will go up like 5 beats per minutes after you stop.
I tried to be as simple as posible, hope this helps.