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	<title>Trainer Confidential &#187; Pain Prevention</title>
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		<title>What To Do About Sore Muscles</title>
		<link>http://trainerconfidential.com/2009/09/02/what-to-do-about-sore-muscles/</link>
		<comments>http://trainerconfidential.com/2009/09/02/what-to-do-about-sore-muscles/#comments</comments>
		<pubDate>Wed, 02 Sep 2009 13:52:40 +0000</pubDate>
		<dc:creator>Nicole</dc:creator>
				<category><![CDATA[Pain Prevention]]></category>
		<category><![CDATA[Strength Training]]></category>
		<category><![CDATA[muscle soreness]]></category>
		<category><![CDATA[pain]]></category>

		<guid isPermaLink="false">http://trainerconfidential.com/?p=510</guid>
		<description><![CDATA[ <p>It’s the morning after you started your new workout program and you wake up feeling fantastic.  Until you move.  All of a sudden you’re aware of EVERY muscle in your body, plus a few you didn’t know you had.</p> <p>I know we’re all familiar with that seemingly inevitable muscle soreness that comes with [...]]]></description>
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<p>It’s the morning after you started your new workout program and you wake up feeling <span style="text-decoration: underline;">fantastic</span>.  <em>Until you move</em>.  All of a sudden you’re aware of EVERY muscle in your body, plus a few you didn’t know you had.</p>
<p><img class="alignleft size-thumbnail wp-image-512" title="42-15653189" src="http://trainerconfidential.com/wp-content/uploads/2009/09/j0424376-150x150.jpg" alt="" width="150" height="150" />I know we’re all familiar with that seemingly inevitable <strong>muscle soreness</strong> that comes with changing your workout routine.  It usually presents itself 24 to 48 hours <em>after</em> you exercise, deviously drawing out the <strong>suspense</strong> of what <em>you know</em> lies ahead.    This delayed onset is typical of this type of soreness, and the pain dissipates rather quickly after another one or two days.</p>
<p>The worst part about delayed-onset muscle soreness (often called “<strong>DOMS</strong>”) is that you never know how much pain you’ll be in, so it is difficult to gauge how much to push yourself in your first workout.  Push too hard and you’re certain to regret it that next morning, especially if you’re new to exercise.  Yet muscle soreness isn’t <em>just</em> for new exercisers.  Experienced athletes fall victim to it every time they increase the frequency or intensity of their strength training, or when they add new exercises.</p>
<p><strong>Treatment</strong></p>
<p>Although prevention is really the best treatment (<em>continue reading below</em>), there are a few things you <span style="text-decoration: underline;">can</span> do at home that will help alleviate muscle soreness.  I would start with the RICE principle (<span style="text-decoration: underline;">r</span>est, <span style="text-decoration: underline;">i</span>ce, <span style="text-decoration: underline;">c</span>ompression, and <span style="text-decoration: underline;">e</span>levation).  <strong>Ice</strong>, in particular, has proven to be useful for some in dulling the pain.  Non-steroidal anti-inflammatory medications (<strong>Ibuprofen</strong> and <strong>Aleve</strong> are good examples) can also help with pain and inflammation within the muscle fibers.</p>
<p>Most importantly, continue to move and exercise when you’re sore.  You shouldn’t perform the same routine that caused soreness, but you <span style="text-decoration: underline;"><em>should</em></span> spend at least <strong>20-30</strong> <strong>minutes </strong>doing low-impact cardio such as <strong>walking</strong> or <strong>biking</strong>.  This loosens up the muscles, gets blood and nutrients flowing more freely to the muscle fibers, and can minimize the level and/or duration of muscle soreness that you will experience.  When you’re ready to try strength training again, make sure you’re thoroughly warmed-up beforehand.  Try running through a couple exercises without weight before you add resistance back in.</p>
<p>Remember that muscle soreness is common and natural, but prolonged pain is NOT.  If you continue to feel pain for more than a week, consult your physician.</p>
<p><strong>Prevention</strong></p>
<p>Because of the <strong>unpredictability</strong> of DOMS, it’s always a good idea to be cautious when beginning a new workout routine.  <span style="text-decoration: underline;">Prevention is the best treatment</span>.  I recommend that my clients not complete the <em>entire</em> program the first day (and sometimes the whole first week or two).</p>
<p><span id="more-510"></span></p>
<blockquote><p><strong>Example:</strong> You’re starting a new workout program that requires 2-3 sets of exercises.  The first day or two, you would only <strong>complete 1-2 sets</strong> of these exercises.  You’ll get all the benefits of the workout without all the soreness.  Of course, you’ll likely experience <em>some</em> muscle pain and stiffness regardless (<em>sorry to break it to you!</em>), but with this solution, at least you’re <em>lessening</em> that amount.</p></blockquote>
<p>And if you haven’t exercised in over a year, play it <em>extra</em> safe and use lighter weights for everything those first two weeks until your body has gotten used to the exercises.  A good rule of thumb is never increase the <strong>frequency</strong> or <strong>intensity</strong> of your workouts by more than <span style="text-decoration: underline;">10% per week</span>.  This ensures a slow, steady exercise progression that won’t overstrain your muscles, risk injury, and cause unpleasant soreness.</p>
<p>Stretching after your workout can also play a big role in reducing next-day muscle soreness.  Make sure you devote a few minutes at the end of your workout to stretches for each major muscle that you worked.  <a href="http://trainerconfidential.com/2009/08/31/what-stretching-can-do-for-you/" target="_blank">Read more on stretching here</a>.</p>
<p><strong>Causes</strong></p>
<p>Although there are several theories as to what actually causes DOMS, most agree it’s the result of tiny <strong>tears</strong> within the muscles.  Research indicates that delayed muscle soreness is most closely associated with <strong>the negative phase</strong> of muscular effort.</p>
<blockquote><p><img class="alignright size-thumbnail wp-image-513" title="42-16033126" src="http://trainerconfidential.com/wp-content/uploads/2009/09/j0430787-150x150.jpg" alt="" width="150" height="150" />To explain, <span style="text-decoration: underline;">think of a Bicep Curl</span>: As you curl the weight up towards your shoulder, your bicep muscle is contracting and shortening (this is the <strong>positive</strong> phase).  As you lower the weight back down to your side, your muscle is relaxing and lengthening (this is the <strong>negative</strong> phase).  During this negative work, your bicep is still actively trying to contract against the weight so that your arm lowers slowly to your side (rather than just giving in to gravity and dropping your arm, which could cause injury).  Thus your muscle is trying to hold a shortened state while you are forcing it to lengthen.  This action is what can cause miniscule tears in the muscle fibers and surrounding connective tissues.</p></blockquote>
<p>That’s not to say DOMS is a bad thing.  As uncomfortable (and often painful) as it can be, those tears are a normal consequence of your body’s adaptation to the movements.  After recovery, your muscles come back <strong>stronger</strong> and with <strong>more</strong> <strong>stamina</strong> than before.</p>
<p>It is also important to realize that soreness <span style="text-decoration: underline;">is NOT</span> a reflection on the quality of your workout.  I know a few people who inevitably scrap their workout program as soon as they <em>stop</em> feeling that soreness the next day.  They are, literally, addicted to the pain.  But the reality is that muscle soreness has a <strong>rapid adaptation response</strong> &#8211; meaning that your muscles will adapt very quickly to a given exercise intensity.  You might experience soreness <span style="text-decoration: underline;">the first time</span> you work out at a new intensity, but you won’t feel pain <em>every</em> time you exercise at that intensity.  Actually, you shouldn’t feel that same level of soreness again until you progress to a higher intensity.</p>
<p>For strength gains, you should push yourself to complete as many repetitions of an exercise as you can <span style="text-decoration: underline;">in good form</span>.  Increase the weight and/or reps (only one at a time) by <strong>no more than 10% each week</strong> to minimize soreness and reduce your risk of injury.  This strategy will ensure you get the most out of your workouts with as little pain as possible.</p>
<p>Remember that muscle soreness is natural for new strength training programs, but it isn’t necessary.  Taking precautions to progress your workout gradually, to thoroughly warm-up before your workout, and to stretch afterwards are just a few of the ways you can minimize delayed-onset muscle soreness.</p>
<p>Do you have any prevention or treatment strategies of your own?</p>
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		<title>How To Avoid Leg Fatigue From Standing</title>
		<link>http://trainerconfidential.com/2009/08/26/how-to-avoid-leg-fatigue-from-standing/</link>
		<comments>http://trainerconfidential.com/2009/08/26/how-to-avoid-leg-fatigue-from-standing/#comments</comments>
		<pubDate>Wed, 26 Aug 2009 10:00:33 +0000</pubDate>
		<dc:creator>Nicole</dc:creator>
				<category><![CDATA[Ask the Trainer]]></category>
		<category><![CDATA[Flexibility]]></category>
		<category><![CDATA[Pain Prevention]]></category>
		<category><![CDATA[Strength Training]]></category>
		<category><![CDATA[core exercises]]></category>
		<category><![CDATA[leg fatigue]]></category>
		<category><![CDATA[leg strength]]></category>
		<category><![CDATA[stretch]]></category>

		<guid isPermaLink="false">http://trainerconfidential.com/?p=488</guid>
		<description><![CDATA[ <p>Q: I have to stand all day at work for 13 hour shifts.  Are there any simple exercises or stretches I can do just to keep myself in shape?  I’m so tired by the time I get home that I don’t have the energy to work out!</p> <p>A: Although it may seem effortless, [...]]]></description>
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<p><strong>Q:</strong> <em>I have to stand all day at work for 13 hour shifts.  Are there any simple exercises or stretches I can do just to keep myself in shape?  I’m so tired by the time I get home that I don’t have the energy to work out!</em></p>
<p><strong>A: </strong>Although it <img class="alignleft size-thumbnail wp-image-491" title="CBR001201" src="http://trainerconfidential.com/wp-content/uploads/2009/08/j0409079-150x150.jpg" alt="" width="150" height="150" />may <em>seem </em>effortless, standing all day requires strength <span style="text-decoration: underline;">and </span>stamina – which is why leg fatigue and back aches are very common for people employed in such occupations.  Retail, food service, construction, landscape, education, and medicine are just a few of the major employment sectors that involve standing for long periods of time during the workday.  Fortunately, there are several things you can do to improve your strength and reduce that end-of-day fatigue.</p>
<p><strong>Focus on Strengthening Your Legs First</strong></p>
<p>Exercise has the wonderful ability to increase both your <strong>energy </strong>levels <em>and </em>the flow of <strong>oxygen </strong>and <strong>nutrients</strong> throughout your body.  If you are consistently working out (at least 3 times per week), then you are already helping to strengthen and energize your body for your strenuous job.  If <em>whole </em>exercise sessions are difficult to work into your schedule, then try to incorporate <span style="text-decoration: underline;">just 10-15 minutes</span> of strengthening exercises each day.  Four 15-minute segments in a week equals two half-hour sessions – which is plenty of time to achieve strength gains, especially if you’re new to exercise.</p>
<p>During your workouts, focus on lower body strengtheners such as lunges, squats, romanian deadlifts, leg curls, leg extensions, calf raises, wall sits, hip bridges, etc.  Lunges and squats, in particular, are two of the best lower body exercises in the book.  They strengthen and tone <em>everything </em>below the waist!</p>
<p><em>(Unfortunately I don’t have any pictures of these exercises to post.  Eventually I’ll be able to post examples, but until then, check out the <a href="http://www.nasmpro.com/nasmpro/library/ex_categories.aspx?fid=232" target="_blank">exercise library at NASMPro for animated illustrations</a>).</em></p>
<p><strong>Then Strengthen Your Core</strong></p>
<p>Core strength is THE most important aspect of fitness, yet it is often the <span style="text-decoration: underline;">weakest link </span>in a person’s muscular structure.  Most sedentary adults are chained to a desk 5 days a week, where core strength and postural awareness get overshadowed by looming deadlines and a high-stress environment.  Having a strong core will not only allow you to function better (both at your desk and away from it), it will help <strong>prevent </strong>back and leg pain as you get older and less active.  This is especially true if your job requires you to be on your feet all day!</p>
<p>The <strong>best core strength exercises</strong> to include in your routine are: <span id="more-488"></span>planks (front and side), crunches, back extensions, and hip bridges.  If you are especially prone to back aches, then I recommend including all four in your routine.  Again, click on the link above for some pictures and descriptions.  I’ll update as soon as I can with actual demonstrations.</p>
<p><strong>Stretch It </strong><strong>Out</strong></p>
<p><img class="alignright size-medium wp-image-489" title="CB060687" src="http://trainerconfidential.com/wp-content/uploads/2009/08/j0407309-239x300.jpg" alt="" width="239" height="300" />Incorporating the above exercises into your program will <em>increase </em>your muscle strength and <em>improve </em>your energy, guaranteed.  But if you don’t stretch those muscles afterwards, you could do <span style="text-decoration: underline;">more damage</span> in the long run.  For example, if you were to perform all four core exercises listed above without ever stretching your back… you’d end up with extremely tight lower back muscles and more lower back pain than you started with.  A tight back would cause the pelvis to tilt forward, the hip flexors to shorten, and the back to sway out.  This is an extremely <em>un</em>natural position &#8211; so you can imagine how your body would feel after standing that way for 13 hours!</p>
<p>A great <em><strong>lower back stretch</strong></em> is to kneel on the floor and sit back on your heels.  Then lean your upper body forward towards the floor, stretching your arms out on the floor in front of you.  Oppositely, you can <em><strong>stretch your abdominals</strong></em> by bending backwards over an exercise/stability ball and letting your arms fall above your head.  Just lean back as far as is comfortable for you.  You’ll want to hold every stretch for <strong>20 to 30 seconds</strong> without bouncing.</p>
<p>For your legs, try lying on your back with the left foot on the floor, knee bent.  Extend the right foot up towards the ceiling, keeping the leg fairly straight.  Grab just below the right knee and hold your leg vertically, feeling the back of your leg stretch out.  This is called a <em><strong>hamstring stretch</strong></em>.  Again, hold for 20-30 seconds.</p>
<p>Thirteen hours is a <em>long </em>time to be on your feet, but with the stretching and strengthening outlined above you should see an improvement in both your energy levels and leg strength within a couple weeks.  Just fit the exercises in where you can – don’t worry about trying to squeeze in an hour at the gym after you’ve worked so many!  Fifteen minutes here and there is enough to get you started and <span style="text-decoration: underline;">seeing results</span>.</p>
<p>Of course, comfortable shoes help too!  Look for soles with sufficient cushioning and arch support.  Your job is important, but <strong>you </strong>should be your number one priority.  Take care of your body and the rest of your activities will become a little easier!</p>
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		<title>Overtraining: Too Much of a Good Thing</title>
		<link>http://trainerconfidential.com/2009/08/10/overtraining-too-much-of-a-good-thing/</link>
		<comments>http://trainerconfidential.com/2009/08/10/overtraining-too-much-of-a-good-thing/#comments</comments>
		<pubDate>Mon, 10 Aug 2009 10:00:02 +0000</pubDate>
		<dc:creator>Nicole</dc:creator>
				<category><![CDATA[Cardio Training]]></category>
		<category><![CDATA[Pain Prevention]]></category>
		<category><![CDATA[cross-training]]></category>
		<category><![CDATA[muscle imbalance]]></category>
		<category><![CDATA[overtraining syndrome]]></category>
		<category><![CDATA[overuse injury]]></category>
		<category><![CDATA[recovery]]></category>
		<category><![CDATA[rest]]></category>
		<category><![CDATA[tendinitis]]></category>

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		<description><![CDATA[ <p>When it comes to your fitness program, more is not always better.  Just as it’s important to exercise your body on a regular basis, it’s also critical to allow your body time to recover from those strenuous workouts.  Now I realize you’re thinking, I just got myself motivated to GO to the gym, [...]]]></description>
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<p>When it comes to your fitness program, <strong>more is not always better</strong>.  Just as it’s important to exercise your body on a regular basis, it’s also critical to allow your body time to recover from those strenuous workouts.  Now I realize you’re thinking, <em>I just got myself motivated to GO to the gym, and now you want me to take time off?!? </em>But trust me, even one day off each week will give your body the time it needs to repair muscle damage, refuel energy stores, and everything else it needs in order to give you the <strong>results </strong>you want.  That’s right – if you don’t let your body rest from its training, your results will suffer… along with your performance, your muscle strength, your energy, etc.  And if you <em>continuously </em>deprive yourself of rest between workouts, you put yourself at risk of developing <strong>overtraining syndrome</strong>.</p>
<p><strong>What Is Overtraining Syndrome (OTS)?</strong></p>
<p>Exercise has a myriad of health benefits, from lowering blood pressure and cholesterol to increasing energy and reducing risk of injury.  Ironically though, <em>too much</em> exercise will cause the opposite to occur.  With overtraining syndrome, you could experience a higher resting heart rate, higher blood pressure, less energy, more injuries… the list goes on.  You fall victim to overtraining when you continuously exercise in excessive amounts <em>without </em>planned recovery time.  This behavior will inevitably lead to injury, chronic fatigue, and a host of other symptoms that not only hurt your performance, but will require time off to recover from.</p>
<p>One such consequence of overtraining syndrome is the <strong>overuse injury</strong>.  As the name implies, this type of injury occurs from repetitive movements performed over an extended period of time.  Although not always associated with overtraining, an overuse injury can be a preliminary sign to step back from your training a little.  Overuse injuries can also be caused by muscle imbalances or inflexibility that have gone unchecked or by training too hard for your fitness level.  Examples here would include runner’s knee, swimmer’s shoulder, tennis elbow, shin splints, tendonitis, and IT band syndrome.  If you are suffering from an overuse injury, allow yourself time to heal with plenty of rest, icing of the injured area, and cross-training with different activities.</p>
<p><strong>What Causes Overtraining Syndrome?</strong></p>
<p>Overtraining is usually caused by one of these situations: 1) not enough planned recovery time in a training program, 2) too much high-intensity training, 3) increasing the intensity or frequency of your training too quickly (a good guideline is to increase your workout intensity by no more than 5 to 10% at a time), or 4) a combination of too much training, too much stress, and too little sleep – all of which have an impact on your body’s ability to rest, repair, and recover.</p>
<p>A carefully designed program must include adequate recovery time, during which your muscles build strength, heal minor tissue damage, synthesize proteins, and refuel.  The length of time required is determined by the type and intensity of your workout and your individual fitness level.  This is the central reason why strength training is done on non-consecutive days; the body needs about 48 hours to rest and repair before you challenge it again.</p>
<p><strong>Signs &amp; Symptoms</strong></p>
<p>So how do you know if you’re overtraining? </p>
<p><span id="more-400"></span>I’ve compiled a list of the various symptoms that have been linked with OTS, although you won’t necessarily experience all of them.  In fact, the most universal symptom of overtraining is <strong>chronic fatigue</strong>, so pay attention to your body!  If you feel tired, rest.  A day off here and there is better than having to take a few months off down the road…</p>
<p><strong></strong></p>
<p><strong>Symptoms of Overtraining Syndrome</strong></p>
<ul>
<li>Chronic fatigue</li>
<li>Elevated resting heart rate</li>
<li>Decreased post-exercise heart rate recovery</li>
<li>Increased blood pressure</li>
<li>Hypoglycaemia (low blood sugar) during exercise</li>
<li>Decreased performance during workouts</li>
<li>Decreased motor coordination</li>
<li>Continual muscle soreness</li>
<li>Digestive upset</li>
<li>Restlessness</li>
<li>Loss of appetite</li>
<li>Sleeplessness</li>
<li>Sudden weight loss</li>
<li>Headaches</li>
<li>Frequent sicknesses</li>
<li>Lethargy</li>
<li>Irritability</li>
<li>Depression<strong><br />
</strong></li>
</ul>
<p><strong>Prevention</strong></p>
<p>Planning recovery time into your program is the key to preventing an overtrained body.  Monitor your fatigue levels, increase your training intensity only gradually, rest when tired, and include cross-training in your workouts to add variety and discourage repetitive movements.  Also be sure to train opposing muscle groups equally and address any muscle imbalances in order to prevent possible overuse injuries.</p>
<p>In the end, it’s important to listen to your body.  Exercise can significantly improve your quality of life, but as with anything else, it has its limits.  If you take the time to recover between workouts now, then you lessen the chance that you’ll have to take months off later.</p>
<p>I’ll be addressing the concept of cross-training in my next article, so be sure to <a href="http://feeds2.feedburner.com/TrainerConfidential" target="_blank">subscribe to my posts</a>!</p>
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		<title>A Burning Question About Lactic Acid</title>
		<link>http://trainerconfidential.com/2009/05/18/a-burning-question-about-lactic-acid/</link>
		<comments>http://trainerconfidential.com/2009/05/18/a-burning-question-about-lactic-acid/#comments</comments>
		<pubDate>Mon, 18 May 2009 20:18:29 +0000</pubDate>
		<dc:creator>Nicole</dc:creator>
				<category><![CDATA[Ask the Trainer]]></category>
		<category><![CDATA[Cardio Training]]></category>
		<category><![CDATA[Pain Prevention]]></category>
		<category><![CDATA[aerobic exercise]]></category>
		<category><![CDATA[anaerobic exercise]]></category>
		<category><![CDATA[anaerobic threshold]]></category>
		<category><![CDATA[ATP]]></category>
		<category><![CDATA[exercise]]></category>
		<category><![CDATA[Exercise Physiology]]></category>
		<category><![CDATA[lactate threshold]]></category>
		<category><![CDATA[lactic acid]]></category>
		<category><![CDATA[muscle fatigue]]></category>
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		<description><![CDATA[ <p> </p> <p>Q: What is lactic acid?  Why does it cause that &#8220;burn&#8221;?</p> <p>A: The simplest answer is that lactic acid is a byproduct of anaerobic ATP production.  But let’s backtrack a little and review some exercise physiology to put that definition into context…</p> <p>A cell can produce energy in one of two ways: [...]]]></description>
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<p><strong>Q:</strong> <em>What is lactic acid?  Why does it cause that &#8220;burn&#8221;?</em></p>
<p><em></em><strong>A: </strong>The simplest answer is that lactic acid is <strong>a byproduct of anaerobic ATP production</strong>.  But let’s backtrack a little and review some exercise physiology to put that definition into context…</p>
<p>A cell can produce energy in one of two ways: <strong>with </strong>or <strong>without </strong>the presence of oxygen.  If there is an adequate supply of oxygen to your cells (regardless of your activity – sleeping, typing, walking, running, etc), then your cells are involved in <strong>aerobic energy production</strong>.  Your cells are actively utilizing fat stores, sugar stores, and oxygen to produce ATP (short for the molecule <em>adenosine triphosphate</em>).  <strong>Think of ATP as your cells’ battery power.</strong></p>
<blockquote><p><strong>Example: </strong>You are attempting to lift a dumbbell into a bicep curl.  First, your body needs fat, sugar, and oxygen in order to produce ATP molecules.  The new ATP is used to drive the muscle contraction in the bicep muscle, allowing you to curl the weight.  Realistically, this occurs on a much grander scale, but you get the idea…</p></blockquote>
<p><img class="alignleft size-thumbnail wp-image-362" title="42-16617126" src="http://trainerconfidential.com/wp-content/uploads/2009/05/j0427818-150x150.jpg" alt="" width="150" height="150" />In aerobic energy systems, <strong>water </strong>and <strong>carbon dioxide</strong> are the byproducts of the chemical reaction that creates ATP.  Both compounds are easy for the body to utilize or eliminate, thus aerobic energy production <strong>does not </strong>lead to muscle fatigue.</p>
<p>On the other hand, sometimes your body is unable to extract enough oxygen from the blood to continue the high demand for ATP production.  Now you begin to exercise <strong>anaerobically</strong>, or <strong>without oxygen</strong>.  This is often the case during vigorous workouts, sprints, heavy weight lifting &#8211; basically whenever the intensity at which you are exercising <em>exceeds the available oxygen</em>.  This upper limit of sustainable aerobic exercise usually corresponds with a heart rate elevated above 50-85% of maximum heart rate, and is referred to as the <strong>anaerobic threshold</strong> (sometimes called <em>the lactate threshold</em>).</p>
<p><span id="more-360"></span>At the anaerobic threshold, the body must continue to create ATP using <strong>alternate </strong>pathways, primarily using sugar as its fuel source (rather than a combination of fat and sugar).  In these reactions, the <strong>byproducts are lactic acid, heat, and hydrogen ions</strong>.  The lactic acid in particular is very difficult to eliminate from the muscle cells, in contrast to the water and carbon dioxide produced in aerobic energy production.  As more ATP is produced anaerobically, more lactic acid is generated and <strong>builds up</strong> within the muscle.  Lactic acid is blamed for the “burn” you feel when you exhaust a muscle (when you do enough lunges, cycle uphill, perform lots of push-ups, etc), and it causes rapid muscle fatigue.</p>
<p>There is nothing wrong with lactic acid build-up in the cells; it is just a natural alternative process for creating ATP when your body is short on oxygen.  The &#8220;burning&#8221; is simply due to the overproduction of acid in the muscle cell, which causes local acidosis.  The muscle then begins to <strong>fatigue </strong>quickly – usually soon after you start to feel that burn.  Once you stop the movement and allow your breathing to return to normal, your cells will be able to eliminate most of the lactic acid within a minute or two.  Continuing to move and walk around will aid in its removal and allow you to progress to the next exercise a little quicker.</p>
<p>References:</p>
<p>Bryant, Cedric X., and Daniel J. Green, eds.  ACE Personal Trainer Manual, 3rd ed.  San Diego: American Council on Exercise, 2003.</p>
<p>Powers, Scott K., and Edward T. Howley.  Exercise Physiology, 3rd ed. Guilford, CT: Brown &amp; Benchmark Publishers, 1997.</p>
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