{"id":2748,"date":"2003-04-01T11:31:46","date_gmt":"2003-04-01T09:31:46","guid":{"rendered":"http:\/\/www.mapeisport.it\/attivita-scientifica\/validity-of-a-submaximal-running-test-to-evaluate-aerobic-fitness-changes-in-soccer-players\/"},"modified":"2023-03-30T10:38:54","modified_gmt":"2023-03-30T08:38:54","slug":"validity-of-a-submaximal-running-test-to-evaluate-aerobic-fitness-changes-in-soccer-players","status":"publish","type":"attivita-scientifica","link":"https:\/\/www.mapeisport.it\/en\/attivita-scientifica\/validity-of-a-submaximal-running-test-to-evaluate-aerobic-fitness-changes-in-soccer-players\/","title":{"rendered":"Validity of a submaximal running test to evaluate aerobic fitness changes in soccer players"},"content":{"rendered":"

Impellizzeri FM 1<\/sup>, Mognoni P2<\/sup>, Sassi A1<\/sup>, Rampinini E 1<\/sup><\/p>\n

1, Physiology Lab, Sport Service MAPEI srl, Castellanza, Italy;2, Istituto Bioimmagini Fisiologia Molecolare, CNR, Segrate, Italy<\/p>\n

Introduction<\/strong> Several studies have been highlighted the importance of training aerobic capacity in order to optimise or improve soccer performance (1). Indeed, VO2MAX <\/sub>has been shown to be related to team level, ranking and distance covered during a match (2, 3). Consequently, several field and laboratory tests have been proposed to evaluate players\u2019 aerobic fitness.\u00a0 Usually, physiological assessments like VO2MAX<\/sub>, or field tests like shuttle-run, require maximal effort and they are commonly used to monitor longitudinal changes.\u00a0 However, maximal tests can be strongly influenced by athletes\u2019 motivation and they are usually not well accepted by the subjects. In 1993 a submaximal test for soccer players was proposed in Italy (4). The test consist in a single run of 6 min duration at 13.5 km\u00b7h-1<\/sup>. In this study, the final [La–<\/sup>] was linearly related to OBLA velocity (r2<\/sup>= 0.91) measured in the same subjects during an incremental test. Consequently, they proposed a regression equation to estimate OBLA velocity.\u00a0 This\u00a0 submaximal constant speed test is commonly used in Italy to test players of various levels.\u00a0 The reason of the widespread of this procedure is probably due to its submaximal nature, quick execution and well acceptance by the athletes. We think that OBLA estimation is not necessary, but [La–<\/sup>] at the end of the 6 min run at 13.5 km\u00b7h-1<\/sup> could be itself a useful index to monitor aerobic capacity changes in soccer players. Thus, the aim of this study was to validate this proposition, correlating the percent change in this test with the percent change in lactate threshold(LT)s measured in laboratory, after 8 weeks of soccer-training and official games. Materials and Methods<\/strong> Sixteen soccer young players (mean \u00b1 SD: age 17.5 \u00b1 \u00a00.6 yrs, weight 70.2 \u00b1 5.0 kg, height 178.5 \u00b1 \u00a04.8 cm), after having signed an informed consent to participate, performed an incremental test on a treadmill and a field test, before (T1) and after (T2) the first 8 weeks of the soccer season. The laboratory test protocol was similar to the one already used by Helgerud et al. (1), that is 1 km\u00b7h-1<\/sup> increment every 5 min, at a treadmill inclination of 3%. Respiratory gases were measured breath by breath with a metabolic cart (VMAX29, Sensormedics, CA), while capillary blood lactate were collected from ear lobe at the end of each step, and immediately analysed (YSI\u00ae 1500 Sport,\u00a0 Yellow Springs, OH).\u00a0 From blood [La-] LT (1.5 mmol\u00b7L-1<\/sup> above baseline)(1) and OBLA (4 mmol\u00b7L-1<\/sup>) were determined.\u00a0 Within one week the players performed the field test running on a track at 13.5 km\u00b7-1<\/sup> for 6 min.\u00a0 At the end of the run [La-] ([La-]FIELD) were measured with the same analyser used in lab setting. The relationships between LTs (VO2<\/sub> and velocity) and [La-]]FIELD, and between percent change of LTs and percent change of [La-]FIELD between the first and the second test, were examined using Pearson\u2019s product moment correlations (r). Results<\/strong> Significant correlations were found between [La-]]FIELD and VO2\u00b7BM-1<\/sup> at LT and OBLA in both tests (-0.62 < r < -0.83).\u00a0 Similarly, significant correlations were found between [La-]]FIELD and velocity at LT and OBLA (-0.62 < r < -0.76).\u00a0 The correlations between [La-]]FIELD, and VO2PEAK<\/sub> were not significant. The percent change (between T1 and T2) of the velocity at LT and OBLA was significantly correlated to the percent change of [La–<\/sup>]]FIELD (r = -0.60 and r = -0.54, respectively; p<0.05). Discussion<\/strong> Our results confirm previous study (1) in which a significant correlation between OBLA velocity and [La–<\/sup>] at the end of the 6 min run were found.\u00a0 In addition, after 8 weeks of training, we have found a significant correlation between changes in this simple physiological field test and LTs measured in the laboratory.\u00a0 These results suggest that this submaximal test can be used to monitor changes of aerobic capacity in alternative to maximal tests.\u00a0\u00a0\u00a0 The lowering of [La–<\/sup>] during submaximal workload should reflect a diminished production and an increase of the clearance capacity of the muscles, as a consequence of increased aerobic capacity (5).\u00a0 As lactate production could be also influenced by diminished glycogen stores due to previous hard training or overtraining., in absence of a maximal lactate value, we suggest to use also the [LA-]:RPE ratio that seems to decrease in overreached athletes (6). Despite we think that maximal and laboratory tests remain the best way to evaluate athletes, even with some limitation, the use of this kind of submaximal test could be a way to test soccer players more frequently and with results not influenced by motivation.\u00a0 To better evaluate the individual minimum detectable change of the [La-] measured during this test, specific reliability-studies are necessary.<\/p>\n

\u00a0REFERENCES<\/p>\n

    \n
  1. Helgerud J, Engen LC, Wisloff U, Hoff J. Aerobic endurance training improves soccer performance. Med Sci Sports Exerc 2001; 33:1925-31<\/li>\n
  2. Smaros G. Energy usage during a football match. In: Vecchiet L, ed. Proceedings of the First International Congress on Sports Medicine Applied to Football. Rome: Guanilo, D, 1980:795-801<\/li>\n
  3. Wisloff U, Helgerud J, Hoff J. Strength and endurance of elite soccer players. Med Sci Sports Exerc 1998; 30:462-7<\/li>\n
  4. Sirtori MD, Lorenzelli F, Peroni-Ranchet F, Colombini A, Mognoni P. A single blood lactate measure of OBLA running velocity in soccer players. Medicina dello Sport 1993; 43:281-286<\/li>\n
  5. Stallknecht B, Vissing J, Galbo H. Lactate production and clearance in exercise. Effects of training. A mini-review. Scand J Med Sci Sports 1998; 8:127-31<\/li>\n
  6. Garcin M, Fleury A, Billat V. The ratio HLa:RPE as a tool to appreciate overreaching in young high-levelmiddle-distance runners. Int J Sports Med 2002; 23:16-21<\/li>\n<\/ol>\n

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