The purpose of this study was to evaluate the ability of individuals with spinal cord injury (SCI) to reach a training threshold during on-court sport activity. Monitors collected heart rate (HR) data every 5 s for 11 wheelchair tennis players (WCT) with low paraplegia and 11 able-bodied controls matched on experience and skill level (ABT). Average HR was determined for time spent in practice (e.g., drills) and game (i.e., a competitive set), and the ability to surpass 50% peak HR (HRpeak) and 64% HRpeak in each condition was evaluated. Average exercise intensity (%HRpeak) was not significantly different between the groups during practice (M WCT = 68.18, SD = 7.53%, M ABT = 68.78, SD = 5.44%; t = 0.22, p = 0.83) or game (M WCT = 68.17, SD = 0.17%, M ABT = 71.55, SD = 4.75%; t = 1.12, p = 0.28). All participants averaged an intensity [greater than or equal to] 50% HR-peak during practice and game, and the difference between group participants averaging an intensity [greater than or equal to] 64% HRpeak was not significant during practice ([chi][squared] = 0.92, p = 0.34) or game ([chi][squared] = 3.85, p = 0.05). In terms of reaching a health and fitness training threshold during tennis, individuals with low-level SCI are similar to matched controls. (Contains 3 tables and 1 figure.)