Medicine and Health Sciences Commons^™

Runner's Stitch And The Thoracic Spine, Darren Morton, T Aune

Darren Morton

The cause of the abdominal pain commonly referred to as "stitch", but more accurately known as exercise related transient abdominal pain (ETAP), had until recently attracted more speculation than research. Explanations for the pain have included diaphragmatic ischaemia, (1) stress on peritoneal ligaments, (2) and irritation of the parietal peritoneum. (3) Although the exact cause of the pain remains to be elucidated, a neurogenic explanation has not appeared in the literature. We present the case of an elite runner who, after a thoracic spine trauma, developed severe and recurrent episodes of ETAP which were relieved by localised treatment. As a …

Heart Rate Responses And Fluid Balance Of Competitive Cross-Country Hang Gliding Pilots, Darren Morton

Darren Morton

Purpose: To evaluate the physiological challenges of competitive cross-country hang gliding.

Methods: Seventeen experienced male pilots (age = 41 ± 9 y; mean ± SD) were fitted with a monitor that recorded heart rate and altitude at 0.5 Hz throughout a competitive flight. Fluid losses were evaluated by comparing pilot pre- and postflight mass.

Results: The pilots’ displacement was 88.4 ± 43.7 km in 145.5 ± 49.4 min. Mean flight altitude was 1902 ± 427 m (range = 1363–2601 m) with a maximum altitude of 2925 ± 682 m (1870–3831 m). The mean in-flight heart rate of the pilots was …

Exercise-Related Transient Abdominal Pain, Darren Morton, Robin Callister

Darren Morton

Exercise-related transient abdominal pain (ETAP), commonly referred to as “stitch”, is an ailment well known in many sporting activities. It is especially prevalent in activities that involve repetitive torso movement with the torso in an extended position, such as running and horse riding. Approximately 70% of runners report experiencing the pain in the past year and in a single running event approximately one in five participants can be expected to suffer the condition. ETAP is a well-localized pain that is most common in the lateral aspects of the mid abdomen along the costal border, although it may occur in any …

Exercise Related Transient Abdominal Pain, Darren Morton

Darren Morton

The causes of exercise related abdominal pain remain to be elucidated.

Effect Of Ingested Fluid Composition Of Exercise-Related Transient Abdominal Pain, Darren Morton, Luis Fernando Aragon-Vargas, Robin Callister

Darren Morton

The present study investigated the effect of ingested fluid composition on the experience of exercise-related transient abdominal pain (ETAP). Forty subjects, susceptible to ETAP, completed 4 treadmill exercise trials: a no-fluid trial and flavored water (FW, no carbohydrate, osmolality = 48 mosmol/L, pH = 3.3), sports drink (SD, freshly mixed Gatorade®, 6% total carbohydrate, 295 mosmol/L, pH = 3.3), and reconstituted fruit juice (FJ, BERRI® orange, 10.4% total carbohydrate, 489 mosmol/L, pH = 3.2) trials. Measures of the experience of ETAP and gastrointestinal disturbances, particularly bloating, were quantified. The FJ was significantly (p < .01) more provocative of both ETAP and bloating than all other trials. There was no difference among the no-fluid, FW, and SD in the severity of ETAP experienced, although the difference between the no-fluid and SD approached significance at the .05 level (p = .056). There was a significant relationship between both the mean (r = 0.40, p < .01) and peak (r = 0.44, p < .01) levels of ETAP and bloating. When the level of bloating was controlled for, the FJ remained significantly (p < .01) more provocative of ETAP than the other conditions, with no difference between the FW and SD (p = .37). The results indicate that in order to avoid ETAP, susceptible individuals should refrain from consuming reconstituted fruit juices and beverages similarly high in carbohydrate content and osmolality, shortly before and during exercise. Further, the mechanism responsible for the heightened experience of ETAP in the FJ trial extends beyond a gastric mass explanation.