Ergogenics aids of priming exercise and ischemic pre-conditioning on VO2 kinetics during swimming at severe domain in tethered conditions

• Grant number: 17/23717-9
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2022
• End date: February 29, 2024
• Field of knowledge: Biological Sciences - Physiology - Physiology of Effort
• Principal Investigator: Dalton Müller Pessôa Filho
• Grantee: Dalton Müller Pessôa Filho
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

Ischemic pre-conditioning (IPC) and the priming exercise are techniques of physiological modulation to obtain acute ergogenic effects on the following exercise. Despite the priming exercise is a procedure with broad support in literature about it ergogenic aids, on the other hand, the IPC technique has no enough bases of results for its applying, as a tool for athletes conditioning planning and performance enhancement. By analyzing the effects of both procedures in swimming, this study will be faced with an unprecedented situation, since the effects of the priming exercise and IPC techniques on swimming tolerance have not yet been addressed in the literature. Thus, this study will contextualize two experimental circumstances involving (1) the effect of priming exercise on the kinetics of oxygen uptake (VO2), swimming in free and tethered conditions; and (2) to compare the effects of the priming exercise and the IPC technique on tolerance at severe domain of exercise intensity. Will be invited at least sixteen trained swimmers, preferably of the same sex. In the first experimental phase, the performance of swimmers will be compared during incremental tests and constant exercises. The latter will be performed at severe domains, but after priming exercise at moderate intensity. In the second experimental stage, the transitions at severe domain will be performed after the application of IPC technique and priming exercise, which will be also performed at severe intensity. In all constant testing phase, the data will be processed by bi-exponential model of VO2 kinetics for the description of the profiles of the VO2 responses. Pulmonary gas exchange will be analyzed breath-by-breath with an automatic portable system (K4b2, Cosmed, Rome, Italy) coupled to the swimmer for a snorkel and specific valve system (AquaTrainer, Cosmed, Italy). The challenge will be to compare two acute strategies of modulation of the physiological response to answer at the same time two questions: (a) which procedure of the prior physiological modulation, namely the prming exercise and IPC, tend to influence tolerance at severe domain of exercise intensity; and thus (b) to define the applicability of the IPC in swimming and identify the metabolic mechanisms that supports the IPC strategy. Given the results, it can be evaluated for the first time the influence of prior exercise strategies (priming exercise and IPC) upon tolerance in swimming, and thus contribute to the proposition of new training schedules and techniques for acute modulation of human performance. (AU)