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Effectiveness of Structured Hypoventilation Training on Cardiovascular Endurance in Swimmers.

International Journal of Drug Delivery Technology · 2026

This study tested whether hypoventilation training—deliberately reducing breathing frequency during exercise—could improve cardiovascular endurance in 55 recreational swimmers aged 16-25 over three weeks. The training significantly improved 400m freestyle swim time (from 294 to 275 seconds), time to exhaustion, recovery heart rate, perceived exertion, and breath-hold duration, though resting heart rate and oxygen saturation didn't change.
Takeaway: Try structured hypoventilation training for 3 weeks to improve your swimming endurance and breath-hold capacity.
Abstract (source)

Background: Cardiovascular endurance is an essential component of swimming performance, as it influences aerobic capacity, fatigue resistance, and recovery.Hypoventilation training, which involves controlled reduction of breathing frequency during exercise, has emerged as a practical

Method: to improve respiratory efficiency and endurance.However, evidence regarding its effectiveness among recreational swimmers remains limited.

Materials and methods: An interventional experimental study was conducted among 55 male and female swimmers aged 16-25 years in Karad.Participants were selected using a simple random sampling

method and underwent a structured hypoventilation training programme for three weeks.Cardiovascular endurance was assessed before and after the intervention using 400 m freestyle swim time, Time to Exhaustion (TTE), Heart Rate, Oxygen Saturation (SpO₂), Rate of Perceived Exertion (RPE), and Maximum Breath-Hold Time.Data were analysed using descriptive statistics along with paired and independent t-tests, with statistical

Significance: set at p < 0.05.

Results: Significant improvements were observed following the intervention.The mean 400 m freestyle swim time improved from 294.20 ± 15.03 to 275.15 ± 11.29 seconds (p < 0.001).Time to Exhaustion, one-minute recovery heart rate, Rate of Perceived Exertion, and Maximum Breath-Hold Time also showed statistically significant improvements.Resting heart rate, peak heart rate, and oxygen saturation did not demonstrate significant changes after the training programme.

Conclusion: Structured hypoventilation training significantly improved cardiovascular endurance, swimming performance, recovery, and breath-hold capacity in swimmers.The

Findings: suggest that this training

method can be incorporated into regular swimming programmes as a safe and effective strategy to enhance endurance performance and respiratory efficiency.

Primary studyOpen accessRecovery & Sleep
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