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"Living Low - Training High" Methods and Physiological Responses in Well-trained Swimmers

Not Applicable
Not yet recruiting
Conditions
Hypoventilation
Normoxia
Normobaric Hypoxia
Interventions
Other: Repeated sprint
Registration Number
NCT06253039
Lead Sponsor
Faculdade de Motricidade Humana
Brief Summary

To overcome the lack of knowledge regarding the impact of different "living low, training high" methods on swimming performance, a 4-week intervention will be carried out to determine and compare the effects of three Repeated Sprints in Hypoxia (RSH) methods with each other and with a control group. Our goal is to characterize and compare the adaptations in swimming performance and in cardiorespiratory, metabolic, and muscle oxygenation responses that can arise after a 4-week training period of RSH and RSH-voluntary hypoventilation (VHL) performed in a ski-ergometer.

Detailed Description

Recently, several new "living low training high" (LLTH) methods involving repeated sprints in hypoxia have shown promising results, especially in team sports. However, the underlying mechanisms remain mostly unclear, as does its effectiveness in improving swimming performance.

Hypoxemia can be induced by exposure to ambient hypoxia conditions, by voluntary hypoventilation at low lung volume, or by vascular occlusion (namely, blood flow restriction). Swimming performance is influenced by aerobic and anaerobic metabolism and could benefit from these different LLTH methods.

This project aims to compare the effects of repeated sprint training performed with a ski-ergometer 1) in a hypoxic chamber and 2) with voluntary hypoventilation on the performance of swimmers, as well as to characterize cardiorespiratory, metabolic, and muscle oxygenation adaptations that may contribute to the improvements achieved after four weeks of each of these types of training.

All groups will be evaluated before and after the supervised training period in three testing sessions in normoxia, separated by at least 24 hours within 7 days. Swimmers will perform: 1) time-trial (100 m front crawl) in the swimming pool to determine performance, V̇̇O2 peak, and lactate concentration following the test; 2) incremental test to exhaustion in the swim-ergometer to determine aerobic peak power, cardiorespiratory responses (V̇̇O2max, ventilatory thresholds), and maximal tissue deoxygenation; 3) time-trial test in the ski-ergometer (100 m) to access performance, muscle and pulmonary oxygen uptake kinetics, and the relative contribution of energetic systems.

Training sessions will be performed in the ski-ergometer and consist of 4 sets of 5x6s all-out sprints with 24s and 5 min of passive rest between the sprints and sets, respectively. In all testing and training sessions, pulse oxygen saturation will be measured for safety purposes.

Recruitment & Eligibility

Status
NOT_YET_RECRUITING
Sex
All
Target Recruitment
36
Inclusion Criteria
  • Swimmers from both sexes;
  • With regular participation in National Championships;
  • More than five years of training experience;
  • No recent exposure/acclimatization to altitude;
  • No recent exposition to Blood Flow Restriction training.
Exclusion Criteria
  • athletes who had an acclimatization experience or exposure to altitude lasting more than 10 days in the last 6 months;
  • pregnant or postpartum women;

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
Hypoventilation (RSH-VHL)Repeated sprintRSH-VHL group will be asked to exhale down to functional residual capacity just before each repetition and then hold their breath until the end of the sprint
Normoxia (RSN)Repeated sprintThe control group will perform the training sessions in normoxia (FIO2, 20.9%)
Normobaric hypoxia (RSH)Repeated sprintThe RSH group will perform training sessions in a normobaric hypoxic chamber at a simulated altitude of 3000 meters (FiO2 14.5%)
Primary Outcome Measures
NameTimeMethod
Time-trialBefore and after 4 weeks of supervised training period

seconds

Ventilatory thresholds and maximum oxygen consumptionBefore and after 4 weeks of supervised training period

mL/kg·min

Lactate concentrationBefore and after 4 weeks of supervised training period

mmol.L-1

Muscle oximetryBefore and after 4 weeks of supervised training period

Near-infrared spectroscopy (NIRS)

Secondary Outcome Measures
NameTimeMethod
Heart rateBefore and after 4 weeks of supervised training period

bpm

Arterial oxygen saturationBefore and after 4 weeks of supervised training period

Oxymetry (%)

Trial Locations

Locations (1)

Faculty of Human Kinetics

🇵🇹

Lisbon, Cruz-Quebrada, Portugal

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