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September 16, 2014High Altitude Medicine & BiologyOpen Access

Muscle Activation During Exercise in Severe Acute Hypoxia: Role of Absolute and Relative Intensity

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Why the study?

Does severe acute hypoxia alter muscle activation during whole body dynamic exercise in healthy young men?

Population

11 physically active and healthy young men, mean age 21.2 years.

Comparison

Incremental cycle ergometer test to exhaustion… vs Incremental cycle ergometer test to exhaustion…

Design

Other, Tests carried out in random order

Follow-up

Acute (during exercise test to exhaustion)

Authors

RTRafael Torres‐PeraltaUniversidad Politécnica de MadridJLJosé Losa‐ReynaUniversidad de ValladolidMGMiriam González‐IzalUniversidad Publica de Navarra

Discussion

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Overview

No immediate clinical implications in patients; hypothesis-generating for muscle-specific activation in hypoxic exercise.

Structured PICO

Does severe acute hypoxia alter muscle activation during whole body dynamic exercise in healthy young men?

P
Population
11 physically active and healthy young men, mean age 21.2 years.
I
Intervention
Incremental cycle ergometer test to exhaustion breathing hypoxic gas (FIO2 = 0.108, PIO2 = 74 mmHg)
C
Comparator
Incremental cycle ergometer test to exhaustion breathing normoxic gas (FIO2 = 0.21, PIO2 = 143 mmHg)
O
Outcome
Muscle activation measured by surface electromyography (EMG) root mean square (RMS) of rectus femoris, vastus medialis, vastus lateralis, and biceps femorissurrogate

Severe acute hypoxia alters muscle activation during dynamic exercise in a muscle-specific pattern, increasing activation at absolute intensities but decreasing it at relative intensities.

Cite This Study

Torres‐Peralta et al. (2014) studied this question.

synapsesocial.com/papers/6a7e1b83fe4ed90abf2354ebhttps://doi.org/10.1089/ham.2014.1027
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Regulation of glycogen phosphorylase and PDH during exercise in human skeletal muscle during hypoxia2000 · 89 citations
  2. 2Influence of exercise intensity on skeletal muscle blood flow, O2 extraction and O2 uptake on‐kinetics2012 · 37 citations
  3. 3Evolution of Electromyographic Signal, Running Economy, and Perceived Exertion During Different Prolonged Exercises2000 · 78 citations
  4. 4Cerebral perturbations during exercise in hypoxia2012 · 104 citations
  5. 5Reduced muscle activation during exercise related to brain oxygenation and metabolism in humans2010 · 172 citations