Medicine and Health Sciences Commons^™

Muscle Cramping During A 161-Km Ultramarathon: Comparison Of Characteristics Of Those With And Without Cramping, Martin D. Hoffman, Kristin J. Stuempfle

Health Sciences Faculty Publications

Background: This work sought to identify characteristics differing between those with and without muscle cramping during a 161-km ultramarathon.

Methods: In this observational study, race participants underwent body weight measurements before, during, and after the race; completed a post-race questionnaire about muscle cramping and “near” cramping (controllable, not reaching full-blown cramping), drinking strategies, and use of sodium supplementation during four race segments; and underwent a post-race blood draw for determination of serum sodium and blood creatine kinase (CK) concentrations.

Results: The post-race questionnaire was completed by 280 (74.5 %) of the 376 starters. A post-race blood sample was provided by …

Changes In The Number Of Circulating Cd34+ Cells After Eccentric Exercise Of The Elbow Flexors In Relation To Muscle Damage, Ho Seong Lee, Makii Muthalib, Takayuki Akimoto, Kazunori Nosaka

Research outputs 2014 to 2021

Background: It has been reported that strenuous exercise increases the number of bone marrow-derived progenitor cells such as CD34⁺ cells in the blood, but no previous studies have investigated the changes in circulating CD34⁺ cells following resistance exercise. This study tested the hypothesis that the number of CD34⁺ cells in the blood would increase after eccentric exercise of the elbow flexors, but decrease in recovery, and the magnitude of the changes would be dependent on the magnitude of muscle damage.

Methods: Nine men (28.0 ± 6.6 years) performed exercises consisting of 10 sets of six maximal voluntary …