Feasibility of a Sprint Interval Training Program During Inpatient Spinal Cord Injury Rehabilitation

Description of the Sprint Interval Training Condition

The SIT treatment procedures will parallel the procedures used in the successful comparative effectiveness trial of SIT versus Moderate Intensity Continuous Training (MICT) during IPR in Canada.

SIT participants will be trained to use an ergometer on a Monark 881 mechanically braked arm ergometer purchased for the study. The Monark will be mounted on a rolling table designed for this purpose, so training can take place in patient rooms or in one of several small therapy rooms adjacent to the inpatient rehabilitation unit. Sessions will begin with the physical or occupational therapist showing the participant the RPE scale (Borg 6-20) posted behind the ergometer and instructing the participant in how to report perceived exertion during each session. The therapist will position the ergometer axle at shoulder height and close enough to the participant to maintain slight elbow flexion. They will attach the heart rate monitor, validate initial recordings, assess resting RPE, and record resting HR and blood pressure. They will have the participant begin a two-minute warm-up at a self-selected speed and zero resistance followed by three 20-second intervals of all-out effort interspersed by 120 seconds of active recovery at zero resistance. During each interval, participants will be instructed to achieve a cadence of approximately 100 revolutions per minute for persons with paraplegia and approximately 85 revolutions per minute for people with tetraplegia. The therapist will adjust ergometer resistance as needed to maintain RPE ratings between 15-17. Rating of perceived exertion is a valid method to prescribe interval exercise intensity and preferable to HR. Heart rate will be recorded continuously and averaged over the entire training session excluding the warm-up and recovery periods. RPE will be measured at the end of each sprint interval training session. To accommodate training adaptation over time, the resistance on the ergometer will be increased to maintain a peripheral RPE of 16. SIT training was well-tolerated and safe in the prior IPR trial as well as in several post-acute SCI studies. Hypotension is a potential adverse event in this setting, especially immediately post-exercise. Thus, sessions will include blood pressure monitoring and surveillance for symptoms of hypotension during and after the exercise session. Adverse events will be reported to the research team for review by the DSMB. SIT training will take place approximately 3 times per week.

Description of the Home Arm Ergometer Condition

Participants randomized to receive ERGO will also take part in SIT approximately 3 times per week. Participants will undergo at least one SIT session on the consumer grade ergometer under supervision of the physical or occupational therapist. The therapist/team will demonstrate all the features of the device set up, use, and resistance adjustment to the patient and caregiver (if available). The therapist/team will problem-solve barriers to home use prior to discharge and contact the patient soon after discharge to help resolve additional problems that may have emerged. The patient will be sent home with an exercise log-sheet like the one used during IPR to guide continued training. Prior to discharge the study team will arrange to have the ergometer given to or shipped to the participant's discharge residence.

The investigators plan to give participants randomized to ERGO a consumer grade tabletop ergometer. Study staff will also provide ace bandages or specialized exercise gloves for patients with tetraplegia who cannot grip the ergometer handles.

Description of the Motivational Interviewing Condition

The motivational interviewing (MI) condition participants will take part in SIT approximately 3 times per week and be provided an ERGO for home use. In addition, participants will receive MI. The sessions will use a MI counseling style consisting of strategic use of open questions, reflections, affirmations, summaries, and information sharing. MI is a widely used, evidence-based counseling approach with evidence of efficacy across many different health behaviors including exercise promotion. The sessions will also include evidence-based content and behavior change principles such as goal setting, activity monitoring, feedback, and identification of barriers and facilitators. This content has been adapted for people with SCI from an unusually successful and highly replicated lifestyle intervention (the Diabetes Prevention Program (DPP)). The investigators will include 10 DPP modules on values and goals, self-monitoring, exercise safety, problem-solving I, relapse prevention, activity cues, problem-solving II, professional help, dealing with negative thoughts, and staying motivated. Participants will receive approximately four weekly 30-minute in-person counseling sessions during IPR and six monthly telehealth sessions during the post-discharge period provided by Dr. Bombardier, an expert in MI and exercise promotion.

Description of the Usual Care Control Condition

Study design includes a control group because our aims include preliminary efficacy as well as feasibility. The investigators chose Usual Care as the control group over other control group options, such as traditional moderate intensity aerobic conditioning in order to know whether the treatment components are potentially more effective than current standard of care. Also, traditional aerobic conditioning (30-45 minute sessions 3 times per week) is not a current component of IPR in the U.S. and is likely not feasible. All patients, including those assigned to usual care, may participate in optional group endurance exercise classes at the end of the day 2-3 times per week. Endurance group classes include moderate intensity continuous aerobic training using any equipment appropriate to the patient's level and severity of injury, as determined by the treating physical therapist.

Data Collection and Measurement Techniques There will be three assessment points: baseline, within the week prior to end of treatment/discharge from IPR, and at 6 months post discharge from IPR. All outcome assessments will be conducted by a trained and supervised research assistant who will be kept unaware of the participants treatment condition. Patient reported outcomes will be assessed via in-person structured interviews for baseline and discharge and via Zoom or telephone for 6-month assessments. A 6-MAT (6 minute arm test) will be done on an arm ergometer around the time of the baseline survey and repeated within one week prior to discharge from IPR. Participants will be asked to wear an Actigraph activity monitor for 1 week approximately 6 months after discharge.