Runner World interpretation: Respiratory muscle training (RMT) targets the muscles that drive breathing and has been investigated as a means to enhance endurance performance in athletes, including runners. Recent systematic reviews and meta‑analyses summarize findings from healthy volunteers and competitive athletes, highlighting potential benefits, the influence of fitness level, and the types of protocols studied. This guide synthesizes that evidence, outlines practical considerations, and clarifies current knowledge gaps to help runners make informed decisions about incorporating RMT into their training. Evidence basis: PMID 22765281, PMID 22836606
This guide is general educational information, not a diagnosis, treatment plan or individualized exercise prescription. Recent surgery, pregnancy, chronic illness, medication concerns, significant symptoms and return from injury require advice from an appropriately qualified clinician.
What is respiratory muscle training?
Peer-reviewed finding: Respiratory muscle training (RMT) comprises two primary approaches. Inspiratory muscle strength training uses resistive or threshold devices that create a load during inhalation, while respiratory muscle endurance training involves sustained hyperpnoea to challenge the ventilatory muscles over extended periods. Both methods have been investigated in healthy volunteers to enhance the capacity and endurance of the muscles that drive breathing. Evidence basis: PMID 22765281
Runner World interpretation: In athletic research, RMT has been applied to explore its impact on sport‑specific outcomes. Although study designs differ, the collective evidence suggests that RMT may be relevant for runners seeking to increase ventilatory capacity. However, the optimal training protocol, dosage, and the precise magnitude of performance benefit for running remain uncertain based on the current literature. Evidence basis: PMID 22836606
Evidence of performance effects
Peer-reviewed finding: A meta‑analysis of eight controlled trials reported a statistically significant improvement in endurance exercise performance after RMT. The benefit was detected by constant‑load tests, time‑trial protocols, and intermittent incremental tests, whereas conventional incremental tests did not reveal a performance gain. These findings indicate that RMT can enhance measures that reflect sustained effort. Evidence basis: PMID 22765281
Peer-reviewed finding: A systematic review of athletes demonstrated a positive effect of RMT on sport‑performance outcomes, including faster time‑trial completions, longer exercise‑endurance time, and increased repetitions on Yo‑Yo tests. The improvements were observed across multiple athletic disciplines, suggesting that the performance gains identified in the studies may be transferable to running activities. Evidence basis: PMID 22836606
Types of RMT and comparative effects
Peer-reviewed finding: Regression analyses across 46 studies showed that participants with lower maximal oxygen uptake experienced larger performance gains from RMT, with an estimated improvement of roughly six percent for each decrement in VO₂max. This pattern implies that less‑fit individuals may derive greater benefit from RMT compared with highly trained athletes. Evidence basis: PMID 22765281
Peer-reviewed finding: The same analyses found no statistically significant difference between inspiratory muscle strength training and respiratory muscle endurance training on performance outcomes. Combined inspiratory and expiratory strength training appeared to produce a larger effect, but this conclusion is based on a limited number of studies and should be interpreted cautiously. Evidence basis: PMID 22765281
Practical implementation tips
Runner World interpretation: The literature notes that training protocols vary widely and that more aggressive progression of training intensity may lead to greater improvements, yet specific guidelines for starting load or incremental progression are not detailed in the cited systematic reviews. Researchers therefore recommend that practitioners tailor the load based on individual tolerance and progressively increase resistance as comfort permits. Evidence basis: PMID 22836606
Runner World interpretation: Assessments that involve sustained effort, such as constant‑load runs or time‑trial performances, are reported to capture changes associated with RMT, whereas conventional incremental tests may not reflect these adaptations. Therefore, coaches often prefer these endurance‑focused tests when monitoring the impact of respiratory training on athletic performance. Evidence basis: PMID 22765281
Limitations and future research
Runner World interpretation: The current evidence base is limited by small sample sizes, heterogeneous training protocols, and a predominance of studies on non‑running sports, which restricts direct extrapolation to distance runners. Consequently, the magnitude of benefit for typical running regimens remains uncertain. Further research is needed to determine how these findings translate to various running distances and training levels. Evidence basis: PMID 22836606
Runner World interpretation: Future investigations should align the ventilatory demands of RMT with those encountered during competitive running and explore progressive intensity schemes. Such research would clarify optimal dosing, identify responder characteristics, and strengthen guidance for runners seeking evidence‑based respiratory training. These efforts could also inform individualized programming and safety monitoring for athletes at different performance tiers. Evidence basis: PMID 22836606