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Caffeine Enhances Intermittent Hypoxia-Induced Gains in Walking Function for People with Chronic Spinal Cord Injury
Randy D Trumbower1,2, Stella Barth2, Christopher Tuthill1
1Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA.
Journal of Neurotrauma
|June 10, 2022
Summary
Caffeine combined with acute intermittent hypoxia (AIH) training significantly improved walking speed and endurance in individuals with chronic incomplete spinal cord injury (iSCI). This combination therapy offers a promising strategy for enhancing mobility and functional independence after iSCI.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Motor Recovery
Background:
- Incomplete spinal cord injury (iSCI) frequently leads to persistent walking impairments, diminishing functional independence.
- Acute intermittent hypoxia (AIH) has shown potential in improving walking function in individuals with chronic iSCI.
- Adenosine accumulation, particularly via adenosine A2a receptors (A2aR), can impede AIH-induced neuroplasticity, a factor not fully understood in human iSCI recovery.
Purpose of the Study:
- To investigate if caffeine, a non-selective A2aR antagonist, can enhance the effects of AIH on walking function in individuals with chronic iSCI.
- To determine the efficacy of combining caffeine pre-treatment with AIH for improving walking speed and endurance.
Main Methods:
- A double-blind, placebo-controlled, crossover study involving 12 participants with chronic iSCI (≥1 year).
- Participants received daily caffeine or placebo (4 mg/kg) 30 minutes before breathing either AIH (FiO2=0.10) or SHAM (FiO2=0.21) episodes for 5 consecutive days.
- Walking function was assessed using the 10-meter walk test (speed) and 6-minute walk test (endurance) at baseline, Day 5, Day 12, and Day 19.
Main Results:
- Participants exhibited significantly improved walking speed and endurance on Day 19 following the caffeine + AIH intervention compared to baseline.
- The enhancement in walking speed persisted significantly longer after caffeine + AIH compared to placebo + AIH or caffeine + SHAM interventions.
- A notable improvement in walking distance was also observed on Day 19 (p=0.012) in the caffeine + AIH group.
Conclusions:
- Pre-treatment with caffeine potentiates the positive effects of AIH on walking function in individuals with chronic iSCI.
- This combined therapeutic strategy demonstrates potential for augmenting walking speed and endurance, offering a novel approach for rehabilitation.
- Further research is warranted to explore the long-term effects and optimal protocols for caffeine-assisted AIH therapy in iSCI recovery.
