The Effect of Different Beverages on Acute Regeneration and Performance During Interval Running
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Journal of Applied Life Sciences International 17(3): 1-12, 2018; Article no.JALSI.41498 ISSN: 2394-1103 The Effect of Different Beverages on Acute Regeneration and Performance during Interval Running K. Baum1* 1Institute of Physiology and Anatomy, German Sport University Cologne, Germany. Author’s contribution The sole author designed, analyzed, interpreted and prepared the manuscript. Article Information DOI: 10.9734/JALSI/2018/41498 Editor(s): (1) Purnachandra Nagaraju Ganji, Department of Hematology and Medical Oncology, Emory University School of Medicine, USA. Reviewers: (1) Rosendo Balois Morales, Universidad Autonoma de Nayarit, Mexico. (2) Faika Şanal Karahan, Necmettin Erbakan University, Turkey. Complete Peer review History: http://www.sciencedomain.org/review-history/24671 Received 3rd March 2018 Accepted 12th May 2018 Original Research Article th Published 18 May 2018 ABSTRACT Purpose: Field studies show, that in several sports a major part of athletes are seriously dehydrated and carbohydrate depleted after a match. Therefore, during sports-game competitions, it is of great importance to optimize short-term regeneration such as fluid and carbohydrate replacement within breaks. In the present study, the influence of taste and composition of beverages on self-selected drink volumes and the resulting performance capacity was investigated during a simulated game. Methods: 11 athletes (3 female, 8 male) performed 5 treadmill-spiroergometries with a break of at least one week between tests. Test 1 consisted of a stepwise increase in speed (1,5 km x h-1 every -1 4 minutes, starting from 8-5 km x h ) in order to determine maximal speed (vmax) and maximal physiologic data. The subsequent tests were applied in random order and consisted of two 30 min. interval runs with speeds depending on individual vmax of test 1. In the 15 min. break between the halves, subjects were offered one of four different beverages to drink ad libitum (Mineral water = MWT, a zero-alcohol beer with 6,4 % carbohydrate content (CHO) = PIT, a zero-alcohol beer with 7,5 % CHO = WET, a 10 % CHO caffeinated beverage = CCT). After the second half, subjects run at 90 % of vmax until exhaustion. Main Results: About one third of the sweat loss was compensated by the halftime drink. The volume of the ingested fluid ranged between 0,43 + 0,19 L and 0,51 + 0,24 L (mean + SD) with no _____________________________________________________________________________________________________ *Corresponding author: E-mail: [email protected]; Baum; JALSI, 17(3): 1-12, 2018; Article no.JALSI.41498 significant differences between beverages. Spiroergometric parameters, as well as lactic acid concentrations, showed no obvious differences between tests 2 to 5. By contrast, running time to exhaustion was significantly longer in WET as compared to MWT and CCT (P=0,05). Discussion: Taste and composition of a beverage appear to be no important influences on drink volume during competition. It is speculated that the differences in running time originate from different sources, a glycogen depletion in MWT and a decreased gastric emptying rate in CCT. Conclusions: In sports-game competitions, besides predetermined breaks also impromtu breaks have to be used in order to counteract dehydration. In order to substitute sweat and carbohydrates during and after exercise in a balanced way, zero-alcohol beer is a promising candidate. Keywords: Sports; exercise; athletes; dehydration; sweat loss; carbohydrates; zero-alcohol beer. 1. INTRODUCTION competition [17,18,19]. A recent study showed that dehydration is also common in athletes of In sports competitions which are interrupted by other sports [20]. Besides the physiological need recovery periods such as the predetermined to drink, other factors like taste, believe, or habits breaks in soccer, basketball, handball, or ice may play an important role. In adult athletes, one hockey, acute regeneration strategies become of of the most popular drinks after training or great importance. The physiological demands of competition is beer [21,22]. Meanwhile, zero- these sports are characterized by interval loads. alcohol forms offer the taste of a beer as well as High-intensities like sprints, rapid direction its carbohydrate content but without the diuretic changes, tackles, or jumps alternate with and other deteriorating effects of alcohol. intermediate to low activities. At the end of a match, fatigue symptoms were reported in In the present study, we investigated two professional soccer [1,2], handball [3,4], ice different zero-alcohol beers in comparison to hockey [5,6], and basketball players [7,8]. mineral water and a popular soft drink as fluid replacements during exercise. We addressed Already a moderate fluid loss of 1,5 to 2 % of two primary outcomes: First, does the taste body weight is able to decline physical influence the volume of fluid ingested during the performance in soccer [9], ice hockey [10,11], break of a simulated team-sports game and, and basketball players [7,8]. Furthermore, Saltin secondly, what is the influence of these drinks on [12] could prove that after a soccer match the performance? muscular glycogen store of the vastus lateralis was lowered by 91%. A more recent study in 2. MATERIALS AND METHODS soccer players performing a friendly match yielded a glycogen reduction of 43% [13]. The present study followed all the relevant However, in that study, a histochemical analysis national regulations and the tenets of the showed that approximately 50% of all fibers were Declaration of Helsinki and was approved by the almost depleted or even totally depleted of ethical committee of the Sport University carbohydrates. Therefore, both the substitution of Cologne, Germany. fluid loss and the refilling of carbohydrate stores are regarded as significant contributors to 2.1 General Overview overcome or at least to reduce the obtained decreases in overall performance. Meanwhile, The empirical part of the study took place from there exists considerable evidence that the 19th of September to the 22th of December carbohydrate containing drinks improve 2017. All tests were performed by means of a performance in team sports [6,8,14,15,16,17]. spiroergometry on a treadmill. Room temperature However, most studies dealing with the effect of and humidity amounted to 22,3 + 0,4°C and 39 + fluid replacement during or in between exercise 4%, respectively. Each subject had to perform follow protocols with certain fluid volumes, which five tests separated by at least one week. is far away from real-life training and match Initially, all subjects performed a stepwise conditions. So it may not be surprising that there incremental speed test (IST). The remaining four is a mismatch between scientific knowledge and tests followed an identical protocol except for the players drink behavior. Real-live research kind of a half-time beverage. They were applied showed that a large proportion of soccer players in random order. Subjects had to run in an become dehydrated during training and interval mode two times 30 minutes separated by 2 Baum; JALSI, 17(3): 1-12, 2018; Article no.JALSI.41498 a break of 15 minutes, during which one of four analysis with suspected exercise induced fluids was offered ad libitum. One minute after asthma. He reported “difficulties to sufficiently the second half, subjects run at 90% of their breath” and “a thightness in the chest” as limiting maximal IST speed until exhaustion. factors in some but not all tests. An analysis of the initial incremental test yielded an unusual 2.2 Subjects high ratio of physiologic dead space over tidal volume at exhaustion (28%) combined with a low Subjects were recruited via local maximal ventilation (88 L / min, for comparison to announcements. If the inclusion and exclusion the other male subjects see Tables 1 and 2). criteria were met, subjects were included in the study after oral and written informed consent. 2.3 Incremental Speed Test The inclusion and exclusion criteria were as follows: After 3 minutes of rest, subjects run on a treadmill (hp-cosmos mercury®, h/p/cosmos Inclusion criteria: sports & medical gmbh, Unterhaching, Germany) for 4 minutes per stage interrupted by 30 age between 18 and 55 years, seconds in order to draw a blood sample. The -1 a history of at least 3 times training per initial velocity amounted to 8,5 km x h and was -1 week on a regular basis over the last two increased by 1,5 km x h every 4,5 minute until years, subjective exhaustion. willing to run until exhaustion in each test. 2.3.1 Measurements Exclusion criteria: Ventilation (Vent), oxygen uptake (VO2), and CO2 cardiovascular and pulmonary diseases, release (VCO2) were measured breath by breath other diseases limiting running until with a spirometry system (Zan 680 nSpire exhaustion, Health, Oberthulba, Germany). Peak values were actual orthopedic problems, calculated offline for the last 30 s before a longer than 5 days journey during the exhaustion. Lactic acid concentration ([lac]) was experimental period. determined at rest and in the 30 s breaks between each speed by means of arterialized Subjects were encouraged to follow their normal blood taken from an ear lobe (Accutrend lactate training habits but had to rest one day before analyser, Roche Diagnostics, Mannheim, each test. If possible, experiments were Germany). Blood glucose concentration ([gluc]) conducted individually on the same day of the was analysed before and two minutes after week. exercise also by means of arterialized