Example: Usain Bolt sprinting 100m.
Or, we can produce ATP...
- ...in larger amounts but relatively slowly with oxygen for exercises that last longer periods of time. Since we don’t accumulate ATP as quickly, our bodies use this method for moderate intensity work and we can stretch this work out over long durations. Producing ATP with the use of oxygen characterizes aerobic metabolism.
Example: Running a marathon.
Now back to the study: Eleven “elite” Japanese male paddlers (defined as National Team competitors) were assessed for their 200m and 500m erg times on a K1 Ergo machine. The subjects paddled on their preferred sides and average power output was measured for these race sims. Aerobic and anaerobic capacity was also calculated by measuring VO2max as the paddlers performed the various capacity tests and race sims. Physical characteristics such as body mass, height, arm girth (both relaxed and tensed), body fat percentage and others were also measured.
Generally speaking, one might believe that a 200m dragon boat race is a predominantly anaerobic activity due to the shorter duration of the race while the longer 500m race has more aerobic demands. The results from the study indicated that for a 200m race lasting approximately 50 seconds, the aerobic energy contribution is 52.1%. For a 500m race lasting approximately 1 minute 50 seconds, the aerobic energy contribution is 67.5%.
Not surprisingly, the longer race which took more time had more aerobic demands than the shorter, faster race. Conversely, this also means that the 200m race requires more anaerobic metabolism than a 500m race. An interesting observation from this however is the relatively equal energy demands of aerobic and anaerobic metabolism for the 200m race sim.
I would have assumed the anaerobic component of a 200m race would be far greater than the aerobic component. This suggests that aerobic training is the predominant energy system utilized for dragon boating and should be a significant aspect of padders’ training regimen.
Another result from the study showed that flexed arm girth was the most powerful predictor of 200m and 500m race performance. But more on that later...
As with any study, this one is not without its limitations. Eleven subjects is not a tremendous sample size for a study. The study only observed males which makes sense to control for gender, but I’d be curious to see if these study results apply to females as well. These tests were performed on paddling ergs as opposed to on an actual boat. Despite these limitations, in fairness, for reasons of practicality it would be more feasible to test small sample sizes of paddlers on ergs where VO2 max measurements and other testing procedures could be carried out.
Paddling style also differs from nation to nation. Specific instructions were given to these Japanese paddlers in terms of stroke rate and other aspects of paddling style, but perhaps national-level paddlers from other countries with different physiological qualities perform better under different parameters which could potentially change the aerobic:anaerobic contributions. This doesn’t necessarily invalidate the study but just speaks to a potential shortcoming in being able to generalize the findings to all paddlers.
I don’t believe the impact of the correlation findings are practically significant because correlation doesn’t imply causation. Just because a skilled paddler has big arms doesn’t necessarily make him a better paddler than someone of comparable experience with smaller arms. Maybe some high-performing paddlers’ arms are big because they do a lot of back-strengthening exercises, many of which are pulling motions in which the biceps are also used for elbow flexion. The observation of hypertrophied arms could just be a side-effect of other more effective strengthening, paddling-relevant exercises. I don’t foresee coaches taking out measuring tapes and checking arm diameters of their paddlers to predict how well they’ll do on races--that’s just silly.
Additional Thoughts & Takeaways
You never hang your hat on one study. This study contributes to the overall data pool of paddling sport-related research, which includes numerous studies on kayaking and rowing too. Incorporating evidence-based principles into coaching approaches and practice should take into account coaches’ individual experiences and values as well, in the same manner PTs combine patient values and clinician experience for evidence-based clinical decision making.
- Both 200m races and 500m races are aerobic and anaerobic activities, with the 200m being more anaerobic than the 500m
- 200m races are almost 50:50 aerobic to anaerobic in terms of energy contribution.
- Dragon boat paddlers should include both aerobic and anaerobic exercise into their training for optimal performance.
So How Do I Train Anaerobically?
While training at your bodys anaerobic threshold, several distinct ventilatory and blood-related phenomena occur. There are steep increases in ventilation, blood lactate concentration, carbon dioxide production and other markers which I won’t go into detail here. True testing of one’s anaerobic threshold involves measuring these numbers which requires a laboratory setting and equipment that most of us don’t have. Not to mention taking blood samples, and who does that in a non-clinical or non-research based setting? That's some Rocky IV Ivan Drago shit. Not very practical, but there’s another way to roughly estimate anaerobic threshold: Training at a target higher than 85% of your maximum heart rate.
Using the Karvonen Formula:
220 - Age = Max Heart Rate
Max Heart Rate - Resting Heart Rate = Heart Rate Reserve
(0.85 x Heart Rate Reserve) + Resting Heart Rate = Anaerobic Threshold Training Zone
So for example, a 27 year old with a resting heart rate of 65 bpm to train anaerobically, he/she must train at a heart rate greater than 174 bpm. Intermittent bouts of high intensity exercise at this heart rate can be an effective method of doing this.
In my next post, I’ll explore different methods of movements and anaerobic exercises conducive to dragon boating training. Stay tuned for more and if you have any questions or comments, please feel free to leave a comment or contact me!
Wilmore, J. H., Costill, D. L., & Kenney, W. L. (2008). Physiology of sport and exercise. Champaign, IL: Human Kinetics.
McPartland, Darren; Pree, Adrian; Malpeli, Robert; Telford, Amanda (2010). Nelson Physical Education Studies For WA. Australia: Nelson.
Ghosh AK. Anaerobic Threshold: Its Concept and Role in Endurance Sport. The Malaysian Journal of Medical Sciences : MJMS. 2004;11(1):24-36.
Ho SR, Smith RM, Chapman PG, Sinclair PJ, Funato K. J Strength Cond Res. 2013 Jan;27(1):137-45.