rytest.

During this test, the initial power was fixed at 150 w (during four minutes) and the increment was of 50 w every four minutes until 300 w. Of the four minute old stages were selected because it was already reported that one three minutes duration is valid to determine Lipoxmax of the high level judoists [13] . Moreover, obtaining a stable state of the gaseous exchange (VO2 and VCO2) during the last minute of each stage was controlled. Once the load of 300 w reached, the increment of power was of 25 w every two minutes, and this until exhaustion (incapacity of the judoist to maintain a cycling frequency above 70 revolutions per minute (rpm) during more than five seconds. The judoists were to develop the greatest possible power. The latter corresponded to the aerobic maximum power (LDC). To reach the LDC, verbal encouragements were given to judoists at the time of the intensities higher than 300 w.

During the test, the heart rate (FC), the VO2, the VCO2 and the RQ were measured continuously, then realised during the 30 last seconds of each stage. Then, the share of oxidation of the lipids was given starting from the formula (which was applied to the first four stages):

[Lipids] (mg/min) = −1.7012 VCO2 (ml/min) + 1.6946 VO2 (ml/min).

The climax of the relation between the power and oxidation of lipids (bell- shaped curve) corresponded to Lipoxmax.

In complement of these measurements, the general RPE were raised at the end of each stage. A sample of blood was taken with the stop of the test. Exhaustiveness was checked by the attack from at least three of the five following criteria:

・ A plate in VO2 max;

・ An increase in the VO2 lower than 150 ml/min in spite of a rise in the power;

・ A QR higher than 1.1;

・ A FC max measured to 90% of the FC max predicted;

・ One [La] higher than 8 mmol/l with the stop of the exercise;

・ A value of RPE from at least 18 at the time of the last entirely supplemented stage.

2.4. Experimental Methods

At a preliminary session, size, body mass and percentage of fat were given [9] . During this meeting, the judoists were familiarized on scale RPE. Moreover, one recommendation of this one and of its recommendations was provided to the judoists, so that they use them at the time of their drives. During this meeting, it was specified with the judoists that they were to avoid the physical activities exhausting during the 48 hours preceding the test.

The recommendations of scale RPE were read and explained to the judoists, right before the test to help the judoists to bind their stimuli to the values of RPE. The period pretest was also used to regulate the heights of saddle and guide.

During the test, the judoists were to maintain a cycling frequency continuously ranging between 70 and 100 rpm. The air of the room was air-conditioned and the temperature maintained between 20˚C and 24˚C. The test was always carried out under medical control (cardiologist and lung specialist).

2.5. Statistical Analysis

The results are expressed in the average form standard deviation (SD) and of confidence interval (CI) at 95% (IC95%). The normality of the distribution of the data was checked by the test of Shapiro-Wilks, while the homogeneity of the variance was confirmed by the Levene’stest. An analysis of variance (ANOVA) to a factor (G1 versus G2) was used to compare all the data. The threshold of significativity was fixed at 0.05 for all the analyses. The statistical data processing was carried out with software Statview 5.

3. Results

The anthropometric and physiological characteristics of the judoists are presented in Table 1 and Table 2. The judoists of group 2 were significantly younger (20.4 ± 1.6 years versus 24.1 ± 5.9 years; p < 0.03) and significantly spent (p < 0.01) more time being involved in training (15.0 ± 1.9 days against 9.9 ± 2.7 days) weekly than judoists of group 1. The RQ recorded before the stop of the test of the judoists of G2 was significantly higher than that of the judoists of G1 (1.38 ± 0.08 versus 1.11 ± 0.05; p < 0.12).

Table 3 and Table 4 bring back the target intensities corresponding to Lipoxmax in the two groups of judoists. These intensities were not significantly different, except for the zones of FC and percentage of FCmax. For these last, the judoists of G2 had zones significantly higher in comparison with the judoists of G1 (112 ± 11 bpm versus 129 ± 13 bpm and 58.6% ± 6.1% versus 65.0% ± 6.5% FC max p < 0.05).

Table 3. Zones of target intensities corresponding to Lipoxmax of the 17 judoists of group 1.

Abbreviations: p, level of significance; LDC, aerobic maximum power; Lipoxmax threshold of maximum oxidation of the lipids; VO2 oxygen uptake; VO2 max, consumption maximum of oxygen; VO2 oxygen uptake VO2 réserve consumption holds of oxygen; FC max, maximum heart rate; RPE, perception of the effort.

Table 4. Zones of target intensities corresponding to Lipoxmax of the 7 judoists of group 2.

Abbreviations: p, level of significance; LDC, aerobic maximum power; Lipoxmax threshold of maximum oxidation of the lipids; VO2 oxygen uptake; VO2 max, maximum consumption of oxygen; VO2 oxygen uptake VO2 réserve consumption holds of oxygen; FC max, maximum heart rate; RPE, perception of the effort.

4. Discussion

This study shows that Lipoxmax is not significantly influenced by the category of weight (<66 kg vs >90 kg) of the involved judoists, except when Lipoxmax is expressed in the form of a FC (bpm) or a percentage of FC max. Consequently, independently of the category of weight, the target intensities corresponding to Lipoxmax in involved judoists are: 37% - 44% LDC, 41% - 47% VO2 max, 35% - 42% VO2 reserve, 44% - 59% FC hold and RPE, 8 - 10. However, a distinction must be made when one expresses Lipoxmax in the form of FC absolute (107 - 110 and 120 - 139 bpm for judoists of less than 66 kg and judoists of more than 90 kg, respectively) or of a percentage of FC max (56% - 61% and 60% - 70% FC max for the judoists of less than 66 kg and those of more than 90 kg, respectively). In theory, zones of intensities target common could be used (E G, for the land period) to prescribe an intensity of exercise allowing to oxidize maximum of lipids, and thus to decrease the superfluous fatty mass of judoists of more than 90 kg [14] [15] and to turn over more quickly to ‘‘the weight of form’’ (particularly after the interseason), without with the precondition duty carrying out an effort test of calorimetry. However, individual analysis of our results reveals that only 29% of judoists of group 1 have Lipoxmax in the target zones of intensities suggested against 24% in group 2, with regard to the %VO2 max. These results are in agreement with literature [2] . Indeed, these authors had already noticed that the significant dispersion of the values of Lipoxmax (from 43% to 59% VO2 max) was comparable with those found in the literature among the boxers and fighters (from 33% to 75% VO2 max). The significant inter individual variance of Lipoxmax makes that the target zones of intensities suggested in the present study do not seem to be used on the ground for the regulation of exercises in Lipoxmax in judoists of more than 90 kg. So in agreement with Brown and al. (2009) [7] , it seems difficult to predict Lipoxmax without realizing with the precondition of effort test of calorimetry, even when one takes account of the sex and the sporting speciality. A future work could be to identify the factors which influence Lipoxmax in judoists, fighters and boxers.

In addition, it is wise to recall that the length of the stages of the effort tests of calorimetry remains discussed [7] [16] . Indeed, some authors showed that one 6 minutes duration (by stage) is preferable at one three minutes duration if one does not want to underestimate Lipoxmax [17] . However, this undervaluation seems to be proven at the sedentary subjects [17] , but “non-existent” statistically among involved fighters [13] . Indeed, Achtenandal., 2002, showed that one duration of three minute old stages would not significantly involve a difference on Lipoxmax of seven fighters involved (VO2 max = 64.2 ± 1.6 ml/kg/min) in comparison at one duration of five minute old stages (Lipoxmax = 5.02 ± 0.10 l/min) versus 4.92 ± 0.13 l/min, respectively) [13] . Similarly, we did not find a difference between the gaseous exchange (VO2 and VCO2 during the last minute of each stage. Consequently, although should be used stages prolonged (one six minutes duration) for judoists of less than 66 kg, the one four minutes duration old stages proposed in the present study seem sufficient since all judoists were high level and the four minutes duration borders that of a fight of judo.

In our study, Lipoxmax (44% ± 8% VO2 max) was comparable with that of other authors [18] [19] [20] . Indeed, Venablesandal. (2005) found already mean Lipoxmax to 48% ± 1% VO2 max among 300 fighters [20] . More recently, Chenevièreandal. (2014) noted that Lipoxmax was located at the neighbourhoods of 44% ± 10% VO2 max in 32 French judoists (17 women and 15 men) [18] . In the same way, Stisenandal. (2006) reported mean Lipoxmax to 56% ± 3% VO2 maxamong eight sporting women involved in endurance brought back [1] . This result is higher than that of this study; however, Jeukendrup and Wallis (2005) made state that the women had their Lipoxmax with a percentage of VO2 max higher of 10% than that of the men [21] . Consequently, this difference can be explained by the effect related to the sex (men versus women).

5. Conclusion

This study shows that the level of category of weight in the Congolese judoists does not influence Lipoxmax (except when this last is expressed in % FCmax). However, we note a broad interindividual variance of Lipoxmax since only one quarter of the studied judoists have their Lipoxmax in the target zones of intensities suggested. Moreover, when one expresses as a percentage Lipoxmax, FC max and category of weight must be taken into account (56% - 61% FC max for less than 66 kg and 60% - 70% FC max for the most 90 kg). Consequently, intensities target common cannot be used for the regulations of exercises in Lipoxmax in the Congolese judoists involved in this study. Therefore, endurance training in judo leads to a better coordination between lipid mobilization and oxidation, which could contribute to reducing the metabolic consequences of high weight.

Acknowledgements

The authors state not to have conflicts of interest in relation to this article.

Footnote

MJGA conceived the original idea of the article. MA worked out the procedure of experimentation, analyzed and treated the data obtained statistically, wrote the handwritten version of the article. IOJ and MKFN worked out the procedure experimentation. PTB read again the final version of the article, inliaisonwith MJGA and MA.

Cite this paper
Moulongo, J. , Massamba, A. , Itoua Okemba, J. , Néla, M. and Tchissambou, P. (2017) Relationship between Category of Weight and Threshold of Maximum Oxidation of Lipids in Congolese Judoists. Journal of Biosciences and Medicines, 5, 74-83. doi: 10.4236/jbm.2017.57007.
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