Would I lose muscle if I change from a high volume lifting to running and lighter lifts?

I've been lifting for 10 months, and I've been doing the program Stronglifts 5x5. I'm going to focus more on running and doing barbell complexes. Would I lose the muscle that I've built? My goal is lower body weight percentage. I've also changed my nutrition to have a deficit.I have no exact reason why I want to lose body fat. I'm doing an obstacle race August 31st and I'm thinking lower weight and less body fat would decrease my time. With the muscle gain I've went from 173 lbs, when I started Stronglifts 5x5, to 200 lbs today. I used to comfortably run 10k's but now I can barely run 2 miles, but my pace increased from 12-14 minute mile to just a few seconds above 9 minutes.

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Recommended Answer:

Well, yes, on deficit, when trying to lower body fat % you are likely to lose some muscle. How much muscle depends primarily on the scale of the deficit.You can do some things to minimize the muscle loss1) Try to not have a deficit larger than 10/15% from your maintenance calories2) When you run, try to do short bursts of cardio instead of low/medium intensity long runs. HIIT have been proven one of the best forms of cardio to preserve muscle3) Make sure you get enough protein 4) Stronglifts is primarily a strength program and is not ideal for muscle building. I am sure you have seen good gains on it, but for muscle size - a higher frequency program is MUCH better.Look into AllPro Beginner workouts. Try to workout each body part at least twice a week (3 if you can). That will both increase protein synthesis and you should make more gainsHave fun.

Other Answers:

• You'll probably lose a bit of muscle, but you'll definitely lose more fat and that will make your muscle more defined. If you are lowing your calorie deficit, I would do light lifting and cardio. If you are eating the same amount then I would lit moderately heavy and add in cardio on opposite days.
• some.but don't chase a number. esp one like bf%.It's very hard to measure accurately unless by underwater weighing which can cost $.post why you want a certain bf%.