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 Form & Fitness Q & AGot a question about fitness, training, recovery from injury or a related subject? 
  Drop us a line at fitness@cyclingnews.com. 
  Please include as much information about yourself as possible, including your 
  age, sex, and type of racing or riding. Due to the volume of questions we receive, 
  we regret that we are unable to answer them all. 
  Fitness questions and answers for December 16, 2008 
    | The Cyclingnews form & fitness panelCarrie Cheadle, MA (www.carriecheadle.com) 
        is a Sports Psychology consultant who has dedicated her career to helping 
        athletes of all ages and abilities perform to their potential. Carrie 
        specialises in working with cyclists, in disciplines ranging from track 
        racing to mountain biking. She holds a bachelors degree in Psychology 
        from Sonoma State University as well as a masters degree in Sport Psychology 
        from John F. Kennedy University. Jon Heidemann (www.peaktopeaktraining.com) 
        is a USAC Elite Certified cycling coach with a BA in Health Sciences from 
        the University of Wyoming. The 2001 Masters National Road Champion has 
        competed at the Elite level nationally and internationally for over 14 
        years. As co-owner of Peak to Peak Training Systems, Jon has helped athletes 
        of all ages earn over 84 podium medals at National & World Championship 
        events during the past 8 years. Dave Palese (www.davepalese.com) 
        is a USA Cycling licensed coach and masters' class road racer with 16 
        years' race experience. He coaches racers and riders of all abilities 
        from his home in southern Maine, USA, where he lives with his wife Sheryl, 
        daughter Molly, and two cats, Miranda and Mu-Mu.  Kelby Bethards, MD received a Bachelor of 
        Science in Electrical Engineering from Iowa State University (1994) before 
        obtaining an M.D. from the University of Iowa College of Medicine in 2000. 
        Has been a racing cyclist 'on and off' for 20 years, and when time allows, 
        he races Cat 3 and 35+. He is a team physician for two local Ft Collins, 
        CO, teams, and currently works Family Practice in multiple settings: rural, 
        urgent care, inpatient and the like. Fiona Lockhart (www.trainright.com) 
        is a USA Cycling Expert Coach, and holds certifications from USA Weightlifting 
        (Sports Performance Coach), the National Strength and Conditioning Association 
        (Certified Strength and Conditioning Coach), and the National Academy 
        for Sports Nutrition (Primary Sports Nutritionist). She is the Sports 
        Science Editor for Carmichael Training Systems, and has been working in 
        the strength and conditioning and endurance sports fields for over 10 
        years; she's also a competitive mountain biker. Eddie Monnier (www.velo-fit.com) 
        is a USA Cycling certified Elite Coach and a Category II racer. He holds 
        undergraduate degrees in anthropology (with departmental honors) and philosophy 
        from Emory University and an MBA from The Wharton School of Business. Eddie is a proponent of training with power. He coaches cyclists (track, 
        road and mountain bike) of all abilities and with wide ranging goals (with 
        and without power meters). He uses internet tools to coach riders from 
        any geography. David Fleckenstein, MPT (www.physiopt.com) 
        is a physical therapist practicing in Boise, ID. His clients have included 
        World and U.S. champions, Olympic athletes and numerous professional athletes. 
        He received his B.S. in Biology/Genetics from Penn State and his Master's 
        degree in Physical Therapy from Emory University. He specializes in manual 
        medicine treatment and specific retraining of spine and joint stabilization 
        musculature. He is a former Cat I road racer and Expert mountain biker.  Since 1986 Steve Hogg (www.cyclefitcentre.com) 
        has owned and operated Pedal Pushers, a cycle shop specialising in rider 
        positioning and custom bicycles. In that time he has positioned riders 
        from all cycling disciplines and of all levels of ability with every concievable 
        cycling problem. Clients range from recreational riders and riders with 
        disabilities to World and National champions. Current riders that Steve has positioned include Davitamon-Lotto's Nick 
        Gates, Discovery's Hayden Roulston, National Road Series champion, Jessica 
        Ridder and National and State Time Trial champion, Peter Milostic.  Pamela Hinton has a bachelor's degree in Molecular 
        Biology and a doctoral degree in Nutritional Sciences, both from the University 
        of Wisconsin-Madison. She did postdoctoral training at Cornell University 
        and is now an assistant professor of Nutritional Sciences at the University 
        of Missouri-Columbia where she studies the effects of iron deficiency 
        on adaptations to endurance training and the consequences of exercise-associated 
        changes in menstrual function on bone health.  Pam was an All-American in track while at the UW. She started cycling 
        competitively in 2003 and is the defending Missouri State Road Champion. 
        Pam writes a nutrition column for Giana Roberge's Team Speed Queen Newsletter. Dario Fredrick (www.wholeathlete.com) 
        is an exercise physiologist and head coach for Whole Athlete™. He is a 
        former category 1 & semi-pro MTB racer. Dario holds a masters degree in 
        exercise science and a bachelors in sport psychology. Scott Saifer (www.wenzelcoaching.com) 
        has a Masters Degree in exercise physiology and sports psychology and 
        has personally coached over 300 athletes of all levels in his 10 years 
        of coaching with Wenzel Coaching.  Kendra Wenzel (www.wenzelcoaching.com) 
        is a head coach with Wenzel Coaching with 17 years of racing and coaching 
        experience and is coauthor of the book Bike Racing 101. Steve Owens  (www.coloradopremiertraining.com) 
        is a USA Cycling certified coach, exercise physiologist and owner of Colorado 
        Premier Training. Steve has worked with both the United States Olympic 
        Committee and Guatemalan Olympic Committee as an Exercise Physiologist. 
        He holds a B.S. in Exercise & Sports Science and currently works with 
        multiple national champions, professionals and World Cup level cyclists. 
       Through his highly customized online training format, Steve and his handpicked 
        team of coaches at Colorado Premier Training work with cyclists and multisport 
        athletes around the world.   Richard Stern (www.cyclecoach.com) 
        is Head Coach of Richard Stern Training, a Level 3 Coach with the Association 
        of British Cycling Coaches, a Sports Scientist, and a writer. He has been 
        professionally coaching cyclists and triathletes since 1998 at all levels 
        from professional to recreational. He is a leading expert in coaching 
        with power output and all power meters. Richard has been a competitive 
        cyclist for 20 years Andy Bloomer (www.cyclecoach.com) 
        is an Associate Coach and sport scientist with Richard Stern Training. 
        He is a member of the Association of British Cycling Coaches (ABCC) and 
        a member of the British Association of Sport and Exercise Sciences (BASES). 
        In his role as Exercise Physiologist at Staffordshire University Sports 
        Performance Centre, he has conducted physiological testing and offered 
        training and coaching advice to athletes from all sports for the past 
        4 years. Andy has been a competitive cyclist for many years. Michael Smartt (www.wholeathlete.com) 
        is an Associate Coach with Whole Athlete. He holds a Masters degree 
        in exercise physiology, is a USA Cycling Level I (Elite) Coach and is 
        certified by the NSCA (Certified Strength and Conditioning Specialist). 
        Michael has more than 10 years competitive experience, primarily on the 
        road, but also in cross and mountain biking. He is currently focused on 
        coaching road cyclists from Jr. to elite levels, but also advises triathletes 
        and Paralympians. Michael is a strong advocate of training with power 
        and has over 5 years experience with the use and analysis of power meters. 
        Michael also spent the 2007 season as the Team Coach for the Value Act 
        Capital Women's Cycling Team. Earl Zimmermann (www.wenzelcoaching.com) 
        has over 12 years of racing experience and is a USA Cycling Level II Coach. 
        He brings a wealth of personal competitive experience to his clients. 
        He coaches athletes from beginner to elite in various disciplines including 
        road and track cycling, running and triathlon.  
        Advice presented in Cyclingnews' fitness pages is provided for educational 
        purposes only and is not intended to be specific advice for individual 
        athletes. If you follow the educational information found on Cyclingnews, 
        you do so at your own risk. You should consult with your physician before 
        beginning any exercise program. |   More fat burningAsymmetrical ride position
 High blood pressure
 Sore thigh muscle
 Leg length discrepancy
 Heel wiggle
 Ankle pain
 Crank length
 
  More fat burningI was curious how weight training would factor into the calorie/weight loss 
  that Johan from Switzerland was enquiring about. Like him I can go on long rides 
  with only refilling my bottles and then maybe a gel towards the end. I ride a lot in the spring/summer and fall and am on track to finish with around 
  4,500 miles for the year. I work out in a gym five days a week doing legs/core 
  work three of those five days. I already try to limit my caloric intake. Obviously 
  with winter here and shorter days I am limited to one hour trainer sessions 
  and whatever I can do on the weekends (weather permitting). So my question is 
  then how much does weight training add to calorie burn/weight loss? Chris WrightDover, New Hampshire
 Scott Saifer replies: 
 
  Great question, because the answer is really interesting. Strength training 
    can add quite a bit to calorie expenditure. For a larger rider, one deep knee 
    bend uses about one kcal. A long session of even shallow squats can use a 
    few hundred calories. Other exercises use plenty of calories as well. The 
    thing is, though, that strength training will not really support weight loss 
    at all for two reasons. The main reason is that strength training will rely 
    mostly on fast twitch muscle and fast twitch muscle uses carbohydrate as it's 
    primary fuel.  A strength training session uses very little fat. You might think, "but a 
    calorie is a calorie, no?" No. If you expend a given amount of energy from 
    carbohydrate, you have to replace that much energy as carbohydrate before 
    your next workout or you'll have a poor workout. Calories expended from carbohydrate 
    stores have to be replaced so there is no weight loss. By contrast, calories 
    expended from fat or muscle protein don't need to be replaced, so exercises 
    that utilise fat as fuel support weight loss and those that utilise carbohydrate 
    don't. The second reason that strength training is not a great way to achieve weight 
    loss is that when you do strength training, you pretty much have to eat enough 
    protein to maintain muscle mass or you lose strength and vigour. So, strength 
    training won't reduce ft mass, and can't consistently reduce muscle mass without 
    inducing exhaustion. 
 Pam Hinton replies 
 
  Weight loss occurs when you are in negative energy balance, i.e., your energy 
    expenditure exceeds your energy intake. When considering your energy balance,you 
    need to think about it over the course of at least a 24-hour period and not 
    just the deficit that results from the exercise itself.  Additionally, to the added energy expenditure associated with resistance 
    training, there are other benefits. Numerous studies have shown that strength 
    training preserves (to a point) skeletal muscle mass during weight loss. This 
    is a significant benefit, as losing leg strength would be detrimental to cycling 
    performance. Moreover, resting metabolic rate is proportional to lean body 
    mass, so losing muscle decreases your maintenance energy requirements.  High-intensity exercise, whether aerobic or strength-training, increases 
    your metabolic rate for several hours after training, during which time, the 
    primary fuel source is stored fat. So, the bottom line is that strength training can facilitate loss of body 
    fat while preserving skeletal muscle mass. However, the magnitude of the effect 
    will depend on both training volume and intensity.   Asymmetrical ride positionI saw your latest fitness response on this subject. While I don't have 
      your broad experience from seeing many bikes, I have found a couple of drivetrain 
      combinations that may not be symmetrical as to Q factor. Most recently, 
      I switched from a Dura Ace (7700) triple conversion on an Ultegra triple 
      bottom bracket (which appears symmetrical) to a SRAM Red compact crank set. 
      Before I did the triple conversion the Dura Ace bottom bracket I used was 
      also symmetrical, although narrower over all. Immediately after the change I had some problems with my left knee that 
      I had long resolved with the Dura Ace setup. When I measured the pedal distance 
      from the (apparently) symmetrical chain stays, the left crank was closer 
      than the right. I have CX-6 Look pedals and when I adjusted the left pedal 
      to be the same distance as the right, the problem disappeared. By the way, 
      the Q factor of the SRAM double was similar to the Dura Ace on the right 
      side. An old Campagnolo "Racing Triple" crankset I used for a while had a similar 
      asymmetry, which I attribute to the longer spindle needed for the triple 
      crank. Mostly the longer right side on the spindle seemed to be needed to 
      accommodate the inner limit of motion of the matching derailleur on my frame, 
      which has a 35 mm seat tube--Campy specs shorter spindles for smaller seat 
      tubes. I didn't have as much of a problem with this setup but that was 11 
      years ago in comparative youth and I only used it for a couple of years. It's safer to say that it's not all uniform from maker to maker, or even 
      year to year. Larry Klose Steve Hogg replies: 
     
  I haven't seen a Red compact crank and so can't comment. Also, I don't deny 
    that the experience you had took place. My point is that it isn't common (at 
    least in my experience) to see a large manufacturers crank set that has an 
    uneven distance between the outer edge of each crank arm at the pedal hole 
    and the centre line of the frame of more than a mm or so, which is within 
    measurement error. range. All of us have functional asymmetries far greater 
    than that and often do little to sort them out.  I'm aware of the Campag cranks that you mention, but that was some years 
        ago and Campag addressed the situation within a year and their triple 
        crank/ bottom bracket set became symmetrical. They needed to too as I 
        saw a couple of riders for whom it caused problems. I saw a lot more who 
        weren't aware of it in the sense that it didn't cause them any issues 
        that they were aware of. What you say about extra distance needed on the 
        drive side for a triple set is partially correct only. It was more the 
        product of poor design. Many years ago, Campag Nuovo and Super Record bottom brackets had an 
        axle that protruded more on the drive side but the crank arms were equidistant 
        from the centre line of the frame when mounted. The reason for the longer 
        axle on the drive side was that it allowed greater contact area with the 
        crank in an era when casting and forging methods weren't as sophisticated 
        as they are now and crank failures were more common. More contact area 
        equalled more support. 
      High blood pressureI am 46 years old and have been cycling competitively for five years. I 
      have a resting pulse of around 54bpm and a max HR of 189. I have been told 
      by three different doctors that I have high blood pressure (regular recordings 
      of 145/90 and higher)I personally don't feel any symptoms of high blood 
      pressure apart from occasional headaches. My doctor has recommended that 
      I be put on permanent medication and here in lies my problem. I have been put on a blood pressure tablet that has a diuretic in it and 
      this causes me to cramp in the latter half of races and long training spins. 
      I normally train at an average HR of 140-150bpm for three hours and race 
      at an average HR of 168 bpm; I have recently tried training without taking 
      any medication and did not suffer with cramps. I do not smoke or drink any alcohol and was just wondering how my figures 
      relate to some who suffers with hypertension? Am I causing myself harm? 
      Although I don't feel like it. Is it possible to find medication for hypertension 
      without a diuretic in it and still continue to race without any adverse 
      effect. Gerald Francis Kelby Bethards replies: 
     
  In short, yes there are other medications that can be tried. We, the medical 
    community, generally start treatment for Hypertension (HTN) with a diuretic 
    or a Beta blocker. Neither of which you should be taking as a racing cyclist. 
    There are others, ACE inhibitors, Angiotensin Receptor Blockers, etc, that 
    can be used and not dehydrate you or blunt your heart rate.  In your case, I do agree with the treatment. HTN is a "silent" process, 
        in that you don't necessarily feel it. BUT, your heart is a pump and has 
        to push against that elevated blood pressure. So, simply put, more pressure, 
        the pump wears out sooner. Less pressure, pump last longer. You aren't harming yourself by exercising and if anything your BP is 
        likely lower because of the exercise. So, don't stop that. But get back into your practitioner and tell them your problem with the 
        current meds. He/she should be able to change it for you. If not, seek 
        another practitioner. 
      Sore thigh muscleI am a 36-year-old male, 182cm tall and weigh approximately 78kg. I ride 
      between 12-15 hours a week, including a longer 3-4 hour ride on the weekends. 
      I've never been properly set up on my bike but have never had any real problems 
      with comfort during rides of any length. In recent months I have started doing more intense sprinting sessions but 
      have noticed that near the end of these sessions that my left lower thigh 
      muscle (vastus medialis) gets quite sore, while my right one seems fine. I am right sided and have played football in the past so my right leg is 
      probably stronger than my left. But that was a long time ago and I would 
      of thought the strength of my legs would have evened out. Daniel HynesLondon, United Kingdom
 Steve Hogg replies: 
     
  The vastus medialis (VMO) plays a part in laterally stabilising the knee. 
    That means that something about your pedaling technique is challenging the 
    plane of movement of the left knee. Common possible reasons are a leg length 
    difference on either side, an uncorrected foot plant on the pedal on either 
    or both sides, an inability to sit square on the seat, a seat height a touch 
    too high or any other factor that tends to destabilise the pelvis on seat 
    under load.  Next time your riding hard, look down between your thighs at the gap 
        between each inner thigh and the seat post. If the gap between left thigh 
        and seat post is greater, you are hanging to the right to some degree 
        which would explain the problem you have. That's probably the most common 
        reason. Get back to me if you need more help. 
      Leg length discrepancyI have been riding competitively for four years. I have an athletic background 
      in running and developed severe chondromalacia/tendinitis in my right knee 
      five years ago. This injury prevented me from running at all and actually 
      was my catalyst for turning to the bike. Two years ago I developed tendonitis 
      in my right knee (upper, inner) while training and racing in Italy. Initially 
      I tried to ride through the pain (for about a month) until it got so bad 
      that I was eating ibuprofen on my long rides just to get through. I then took about a month off the bike until it was eventually pain free 
      enough to ride. I haven't had a problem with it since. Now, however, and 
      since the injury, I've felt as though my right leg is extending more than 
      my left (that the seat is too far forward for my left leg but too far back 
      for my right). This has led me to be "one of those guys" who is constantly 
      messing with his position. I don't have a leg length discrepancy that I 
      am aware of. Do you have any ideas what might be causing this problem? Thanks 
      for your help! Chris DuffyLos Angeles, CA, USA
 Dave Palese replies 
     
  I'm sure for as many coaches you ask, you'd get the same number of different 
    answers to this question. So here is my take.  We're really talking about two different things here. The first is the workload of the interval, in this case the amount of time 
    you will be producing power in a certain range. The second is frequency. Or, 
    how often your do repeats during a session and the amount of time between 
    them. As far as workload goes, the length of the interval you are doing to 
        improve threshold power can be almost any length (but I'll be speaking 
        to that statement in a minute) as long as it is more than say 6 minutes 
        or so. Now, that being said, I don't usually prescribe true "threshold" 
        intervals of 45 minutes. I have found that intervals between 6 and 20 
        minutes at threshold power have yielded the best results with my clients 
        over the years. In my opinion, any thing longer the power towards the 
        end drops enough that minimal gains are realized and the time spent is 
        a bit of waste and can even induce fatigue that can affect later sessions. Now to the point of frequency: when it comes to the rest between threshold 
        intervals that can vary depending on the workout environment. As a general 
        rule, I usually prescribe 3-5 minutes depending the riders fitness and 
        the time of year. In a situation like yours, doing the intervals on a 
        longer ride, you have little control over the distance between hills, 
        so you are at the mercy of your course. That is the compromise you make 
        when you ride on the road. Now, you could ride up and down a hill or portion 
        of a hill to control the frequency better. When it comes to threshold training, the length of the rest between intervals 
        is less important that with super-threshold training (i.e., anaerobic 
        capacity intervals). I prescribe the 3-5 minute range of rest so that 
        during a session the client could do, say, 3 intervals of 15minutes with 
        4 minutes rest between. This gets back to my comments about how during 
        longer intervals the power can drop during the later portions of the effort 
        and be of little significance. When you break the total volume up into 
        smaller chunks, you'll spend more time in the optimal training range, 
        since you'll get a bit of recover every 15 minutes. Then the overall quality 
        of the 45 minutes of threshold training is higher and should yield better 
        results. So that is my, albeit long-winded, take. Hope it helps. 
     Steve Hogg replies: 
     
  When you say, "I don't have a leg length discrepancy that I am aware of" 
    what have you done to determine whether you do or not?  External measurements don't count as they aren't accurate.X rays or scans, 
        properly taken are definitive. From what you describe you are not sitting 
        squarely and have the left hip further forward than the right on the bike 
        seat. This reduces the distance that the left leg reaches to the pedals 
        and increases the distance that the right leg reaches to the pedals How's this for a scenario? You had a pre existing issue that you were unaware of. As evidence is 
        the chrondomalacia of the right knee that you had as a runner. Why the 
        right knee and not both knees? The obvious answer is some functional or measurable asymmetry. So you 
        take up bike riding and then go to Italy to race and train. Italy is mountainous 
        so it is likely that you had to ride harder in terms of the length and 
        gradients of the climbs as well as possibly the intensity.. So by working 
        harder, your underlying asymmetry asserted itself and your right knee 
        was again the casualty. You have recovered from that now, but I assume 
        you're at home and are not riding as hard or perhaps in as tough a terrain 
        as you were in Italy. What to do?  Find a good structural health professional who is a cyclist, or who 
        has a cycling clientele, and find out what the issues are. Once armed 
        with that knowledge (and probably with advice from the chiropractor, physiotherapist 
        or osteopath that you see).get back to me and I'll attempt to advise. 
      Heel wiggleI am a cat 3 and 45+ racer, my height is 5'7" and I weigh 155lbs. I have 
      a left right wiggle at the bottom of the pedal stroke on my left foot only. 
      I have noticed my son has the same thing going on. We both use Speedplay 
      x2 pedals. We are both 5000+ mile per year riders and have no knee pain. 
      We both use Specialized Pro and S-Works shoes. Mine are new and his are 
      two years old. I use the green insole in mine because I have a high arch, 
      he uses the stock ones. Paul Mathieu Steve Hogg replies: 
    
  
  Like father like son I suppose. The left foot 'wiggle' you mention can be 
    caused by the right hip moving backwards at the top of its pedal stroke and 
    then rebounding forward as top dead centre is passed on the right side pedal 
    stroke. It can also be caused by using a seat height that is too high by a 
    few millimetres. If the seat is even a touch too high (but not high enough 
    to cause injury) we will all autonomically favour one side, usually the right, 
    with any fallout tending to be on the left side. What I'd suggest is drop 
    your seat 5mm and get back to me if there is no improvement.   Ankle painMy wife and I ride a road tandem and have aspirations of doing some longer 
      (100+ miles) rides but her left ankle keeps preventing this. - We have been fit on our tandem by Paul Swift and Katrina Vogel (bikefit.com) 
      who are friends and who I have worked with before, so I'm very confident 
      the bike fits both of us well.- Since my wife does not ride as much as I do (she pretty much only rides 
      when we are on the tandem and I race on the road) her natural pedaling cadence 
      is slower than mine but even if I make a conscious effort to ride in larger 
      gears and/or slow down the cadence her ankle will still start to bother 
      her after about 30 or 40 miles.
 - Running does not bother her and she has completed two half marathons with 
      no pain in her ankle at all.
 - She rides with SPD cleats and MTB shoes and her cleats are adjusted pretty 
      neutral both in terms of fore/aft positioning and in terms of toe in/out.
 - We did complete one century last summer and the last 20 miles were extremely 
      uncomfortable for her. Afterwards the pain lasted for at least one week.
 - The pain/discomfort is located right above her heel in the Achilles tendon. 
      It's definitely not a muscle or joint pain.
 - We both suspect that cycling flexes the ankle LESS than running so this 
      pain is a mystery to us.
 What do you suggest we try? I have considered moving the cleats as far back on the shoes as possible 
      but this would only change their position by maybe 5 millimetres. I have also considered trying a pedal like the Speedplay X Series to allow 
      as much float as possible but I'm dubious about the benefit as the problem 
      seems to be related to ankle flexing and has nothing (I think) to do with 
      how her knee tracks. Martin CriminaleSeattle, WA USA
 Steve Hogg replies: 
    
  
  Don't underestimate the effects of moving a cleat back 5mm. It may not seem 
    like much but can make a substantial difference to feel and the short term 
    (and sometimes permanent) solution to an Achilles problem almost always involves 
    shortening the foot's lever length (moving the cleat rearwards).  I have never met Paul Swift but do have an email relationship with him. 
        I also that know he has an excellent reputation as a knowledgeable guy. 
        As you are socially acquainted, I would suggest contacting Paul as first 
        option. I'll tell you why. In an ideal world, a bike fit should be a one off occasion unless the 
        rider changes noticeably over time in a functional sense, or changes equipment. 
        But what can happen from time to time, is that a rider comes to a fit 
        session displaying a particular pedalling technique and what I call on 
        bike "body language". Even if substantial changes to position are made, 
        the rider can sometimes leave the fit session with much the same way of 
        pedalling and relating to the bike as when they arrived. Then over the next few weeks or months, as the changes in motor pattern 
        dictated by the new position take hold, the rider can change their way 
        of relating to the bike. Usually subtly, sometimes obviously. This means 
        that it can sometimes be necessary for a follow up visit to tweak the 
        position to allow for the changes in technique.over a period, and as you 
        deal with a reputable person, that's what I would suggest. Let me know how you get on. 
      Crank lengthI am a recreational triathlete and although I notice you guys have tons 
      of questions on crank length I have yet another one. It seems to me that 
      in triathlon applications, especially long distances like an Ironman, it 
      would be beneficial to use a shorter crank at higher rpm in an effort to 
      enlist more slow-twitch muscles and remain as aerobic as possible on the 
      bike. I naturally pedal somewhere between 90-95 rpm and am hoping a shorter 
      crank will also allow me to pedal more perfect "circles" thus being more 
      efficient with my energy. Let me know what you guys think. John MaaloufHonduras
 Steve Hogg replies: 
     
  Without getting into the enlistment of muscle fibre types or aerobic changes, 
    which I don't know enough about to comment on, if you are in doubt about crank 
    length it is better to err on the conservative side. Whatever your crank length, 
    don't expect going up or down 1 size (2.5mm) to make a lot of difference because 
    it won't. But you are right that over 180kms, a small difference may be a 
    benefit or a hindrance, just don't expect miracles.  In a personal sense, the only way that you'll find out is to try what 
        ever length your thinking of. 
    
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