No Improved Performance With Repeated-Sprint Training in Hypoxia Versus Normoxia: A Double-Blind and Crossover Study

Montero, David; Lundby, Carsten

doi:10.1123/ijspp.2015-0691

Cited by 54 publications

(46 citation statements)

References 23 publications

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“…Taken together, these observations indicate that higher power productions in the posttest in TR NOR resulted in higher fractional O 2 -extraction, whilst in TR HYP O 2 -delivery conceivably was increased due to elevated perfusion, yet at constant fractional O 2 -extraction rate. These findings corroborate recent observations (Faiss et al, 2013b, 2015; Montero and Lundby, 2017) showing more pronounced increases in the amplitude of tHb shifts during intermittent whole body sprinting in normoxia following a period of repeated sprint-training in hypoxia vs. normoxia. A potential mechanism to explaining these greater amplitudes in ΔtHb's in TR HYP , indicating greater blood volume shifts, is higher degree of arteriolar dilation in conjunction with increased capillary volume.…”

Section: Discussionsupporting

confidence: 92%

“…Therefore, extrapolations from the present study from single-leg HIIT in hypoxia, to whole-body HIIT in hypoxia should be performed with caution. Studies investigating whole-body exercise have produced equivocal results, with two studies showing improved intermittent cycling (Faiss et al, 2013b) or double-poling (Faiss et al, 2015) sprint performance following a period of RSH, vs. one other study showing no such ergogenic effects on repeated cycling sprint performance (Montero and Lundby, 2017). Clearly, more studies are needed to define the conditions wherein hypoxic training could enhance high-intensity intermittent exercise performance.…”

Section: Discussionmentioning

confidence: 99%

“…Yet sprint interval training in both normoxic and hypoxic conditions failed to increase muscular buffering capacity (De Smet et al, 2016). Recent observations also indicate that RSH may facilitate muscular perfusion during intermittent contractions (Faiss et al, 2013b, 2015; Montero and Lundby, 2017). Furthermore, there is evidence to indicate that training in hypoxia may stimulate angiogenesis in muscle tissue (Montero and Lundby, 2016).…”

Section: Introductionmentioning

confidence: 95%

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Physiological Adaptations to Hypoxic vs. Normoxic Training during Intermittent Living High

et al. 2017

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In the setting of “living high,” it is unclear whether high-intensity interval training (HIIT) should be performed “low” or “high” to stimulate muscular and performance adaptations. Therefore, 10 physically active males participated in a 5-week “live high-train low or high” program (TR), whilst eight subjects were not engaged in any altitude or training intervention (CON). Five days per week (~15.5 h per day), TR was exposed to normobaric hypoxia simulating progressively increasing altitude of ~2,000–3,250 m. Three times per week, TR performed HIIT, administered as unilateral knee-extension training, with one leg in normobaric hypoxia (~4,300 m; TRHYP) and with the other leg in normoxia (TRNOR). “Living high” elicited a consistent elevation in serum erythropoietin concentrations which adequately predicted the increase in hemoglobin mass (r = 0.78, P < 0.05; TR: +2.6%, P < 0.05; CON: −0.7%, P > 0.05). Muscle oxygenation during training was lower in TRHYP vs. TRNOR (P < 0.05). Muscle homogenate buffering capacity and pH-regulating protein abundance were similar between pretest and posttest. Oscillations in muscle blood volume during repeated sprints, as estimated by oscillations in NIRS-derived tHb, increased from pretest to posttest in TRHYP (~80%, P < 0.01) but not in TRNOR (~50%, P = 0.08). Muscle capillarity (~15%) as well as repeated-sprint ability (~8%) and 3-min maximal performance (~10–15%) increased similarly in both legs (P < 0.05). Maximal isometric strength increased in TRHYP (~8%, P < 0.05) but not in TRNOR (~4%, P > 0.05). In conclusion, muscular and performance adaptations were largely similar following normoxic vs. hypoxic HIIT. However, hypoxic HIIT stimulated adaptations in isometric strength and muscle perfusion during intermittent sprinting.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Physiological Adaptations to Hypoxic vs. Normoxic Training during Intermittent Living High

et al. 2017

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“…). Curiously, in their first RSH study (Montero & Lundby, ), the authors have used the same criteria. How coherent is this?…”

Section: Living High Training Low (Lhtl)mentioning

confidence: 99%

Clarification on altitude training

Millet

Brocherie

Faiss

et al. 2016

Experimental Physiology

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“…As correctly stated by Millet and colleagues, we find the applied study protocols in their repeated sprint training in hypoxia (RSH) studies of questionable quality and they rightfully wonder why we then used the identical protocol in a subsequent study (Montero & Lundby, ). The answer here is simple; we aimed to replicate their studies, and in case of a negative study outcome (which seemed reasonable to assume) we wanted to avoid the criticism of having applied a divergent test protocol, which others would suggest could be the reason for the negative results.…”

mentioning

confidence: 98%