During the “pause” period in this thread I researched more the RSA (repeated sprint ability), and I found the folowing article: The Effects of Strength (Resistance) Training on Repeated Sprint Ability and Muscle Buffer Capacity
The research found that VO2max have medium correlation with RSA tests (10x40m, 5x6sec, Bangsbo sprint test etc), but the research found betam (buffering capacity expressed of a muscle expressed something like deltabLA/deltapH ) to have great correlation with power-decrement in RSA tests…
Some authors (Weston) have suggested that accumulation of H+ is important in developing muscle buffer capacity, but does this means that to improve betam and as a result of that RSA, athletes should do the speed/special endurance work (lactate capacity)?
Aziz (Journal of Applied Sports Sciences 16: 14-22, 2004) found very low correlation with Wingate test with RSA test. Wingate test is used to assess anaerobic capacity. Wadley & La Rossignol (J Sci Med Sport. 1998 Jun;1(2):100-10.) stated: “the results indicate that the best 20 m sprint time was the only factor to correlate significantly with total sprinting time (r = 0.829, P < 0.001) and percentage decrement (r = -0.722, P < 0.01). VO2 max and AOD [Accumulated Oxygen Dept] were not related to the total sprinting time or the percentage decrement that was produced by the RSA test. This was interpreted to signify that the phosphagen system was the major energy contributor for this test”
According to this two studies training to improve oxygen-independent glycolysis (20-40 almost maximal effort) (altought we are talking about cross study) will not improve RSA. Not that Bangsbo uses “speed endurance training” both “producing” and “maintenance” type, will small yearly volume, to increase match run distance in elite-soccer players (source: Fitness training for soccer).
Also, speed endurance training (both production and maintenance training) will interfere with speed training. So maybe another training type should allow increase in buffering capacity without interfering with speed training.
Edge et al (Med Sci Sports Exerc. 2005 Nov;37(11):1975-82.) compared effects of cycling interval training (6-10, 2-min intervals at 120-140% LT) and continuous training (20-30 min at 80-95% LT) matched for total work, on VO2max, LT, RSA. Theri results and conclusions are the following: “RESULTS: Both groups had significant improvements in VO(2peak) (10-12%; P < 0.05) and LT (8-10%; P < 0.05), with no significant differences between them. Both groups also had significant increases in RSA total work (kJ) (P < 0.05), with a significantly greater increase following HIT than MIT (13 vs 8.5%, respectively; P < 0.05). There was a significant decrease in resting [ATP] and an increase in postexercise La(-) for both groups, but no significant differences between them. There were no significant changes in resting or postexercise [PCr], [Cr], muscle [La(-)], or [H(+)] after the training period. CONCLUSIONS: When total work is matched, HIT results in greater improvements in RSA than MIT. This results from an improved ability to maintain performance during consecutive sprints, which is not explained by differences in work done during the first sprint, aerobic fitness or metabolite accumulation at the end of the sprints”
So, according to the data presented here we could assume the following:
- VO2max have small/medium correlation with RSA tests (both decrement and best result)
- Betam have large correlation with RSA test (decrement)
- To increase betam H+ should be increased
- Speed endurance training (lactated production/toleration) increases H+ and thus increase betam (buffer capacity) but in the same time interfere with speed abilities and development, so it should be planned accordingnly and used only with elite players (Bangsbo)
- To increase RSA training should be intermitent in nature. The effects of intermitent training compared to continuous may not be explained by VO2max increase, resting or postexercise P, LA, H+. I can only speculate that the Central Governor (Autonomic Nervous System) imporved its control over functional systems, as outlined in my previous post on this very issue.
- Tempo can increase buffer capacity. The speed should not be faster than 75% of best time to avoid interfering with speed sessions. Rest should be progresivelly reduced as the athletes adapt
- Specially designed strength training (large number of reps, short rest between sets) may improve buffer capacity and thus RSA. So, this may me the mechanism of power’s work capacity gym work on RSA. Note that the study from the begining was not conducted yet. I should ocntact the author and ask him about the results. Also, this kind of work may interfere with strength, speed and power development, but in the same time it will get rid of the body fat
I hope I did’t missed the “thread”, becasue we were discussiong about work capacity in the gym transfer to the field (RSA).
I hope this bring us some answers but a lot of new questions…