Tidal volume in supine position pre and post ingestion of caffeine.

<p>* = outlier; § = significant difference between pre and post (p < 0.05).</p

Participant recruitment flowchart.

<p>Participant recruitment flowchart.</p

Characteristics of spinal cord injured participants.

<p>Characteristics of spinal cord injured participants.</p

MeanRR, SDNN, RMSSD and heart rate during rest in sitting and supine position.

<p>MeanRR, SDNN, RMSSD and heart rate during rest in sitting and supine position.</p

Blood pressure pre and post ingestion of either placebo or caffeine.

<p>Blood pressure pre and post ingestion of either placebo or caffeine.</p

Heart rate variability (HF, LF, LF/HF and TP) pre and post ingestion of either placebo or caffeine supplementation in able-bodied, paraplegic and tetraplegic participants in supine and sitting position.

<p>Heart rate variability (HF, LF, LF/HF and TP) pre and post ingestion of either placebo or caffeine supplementation in able-bodied, paraplegic and tetraplegic participants in supine and sitting position.</p

Differences in tidal volume (supine position) from pre to post ingestion between placebo and caffeine trial.

<p>° = outlier; * = extreme outlier; § = significant difference between the change from pre to post caffeine compared to placebo ingestion (p < 0.05).</p