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Determining the Appropriate Intensity of Exercise to Prevent Post-exercise Hypoglycemia in Persons Living With T1D

2018년 6월 27일 업데이트: Jon McGavock, University of Manitoba

Determining the Appropriate Intensity of Vigorous Intensity Exercise to Prevent Post-exercise Hypoglycemia in Persons Living With Type 1 Diabetes

Over 300, 000 youth and young adults across Canada are living with Type 1 Diabetes (T1D) which is considered the most common endocrine condition. Physical activity offers numerous health benefits however the majority of persons living with T1D are physically inactive, primarily due to fear of low blood sugar (hypoglycemia). This fear of hypoglycemia continues to exist for physically active persons with T1D as no established physical activity guidelines exist. Several acute studies have used high intensity interval training as a way to reduce the risk of hypoglycemia as it has the ability to activate fight or flight hormones which can raise blood sugar; however the intensity needed to elicit this response is unknown.

The purpose of this project is to determine the acute effects of varying exercise intensities on the time spent in a low blood sugar range in 10 sedentary (VIGOR acute sedentary) and 16 physically active (VIGOR acute trained) individuals with T1D. Each participant will complete a maximal exercise test prior to the exercise sessions. Sedentary participants will complete 45 minutes of continuous moderate intensity exercise at 45-55% heart rate reserve (HRR) and three high intensity interval sessions with six one minute burst of high intensity at 70%, 80%, or 90% of HRR every four minutes. Active participants will complete 45 minutes of moderate intensity exercise at 45-55% of HRR and one high intensity interval session at 90% of HRR with intervals spaced every two minutes.

The investigators will track the blood sugar response to exercise using a device called a continuous glucose monitor (CGM) which records blood sugar every five minutes over a period of six days. The CGM will help determine which exercise intensity does a better job at reducing the time spent in a low blood sugar range. The information gained through this study will help individuals with T1D remain active without fear of low blood sugar and provide guidelines for professionals working with this population.

Adding high intensity bursts at 80% and 90% of maximum aerobic capacity (active participants) or heart rate reserve (sedentary participants) to a moderate intensity exercise session will significantly reduce the amount of time spent in a low blood sugar range in sedentary and active persons with T1D compared to moderate intensity exercise alone.

연구 개요

상태

완전한

개입 / 치료

상세 설명

Sedentary Arm: This portion of the study is complete. 10 participants completed the study in its entirety. Maximal exercise testing utilized a Parvomedics Metabolic cart to analyze oxygen consumption in ml/kg/min and maximum heart rate. Results from this test were used to estimate intensity using heart rate for the exercise sessions. Prior to each exercise session, participants arrived at 4:00 PM ate a Glucerna bar (to prevent drastic falls in glycemia with exercise) and had an IV inserted. A total of six blood samples were taken at each session at the following timepoints: (1) 0 mins-baseline, (2) 10 mins- end of warm up, (3) 35 mins-end of intervals, (4) 45 mins-end of exercise, (5) 75 mins-mid recovery, and (6) 105 mins-end of exercise. Each blood draw was sampled for glucose, cortisol, and growth hormone. Before exercise, blood glucose was measured on a handheld glucometer. If blood glucose was <5.7 mmol/L glucose was administered via Dex4 tablets. Exercise did not begin until blood glucose was at least 5.7 mmol/L. If blood glucose was greater than 16.7 mmol/L but less than 20.0 mmol/L ketones were tested on a urine ketone strip. If ketones were negative or trace exercise began.

The first exercise session was 45 minutes of moderate intensity exercise at 45-55% of heart rate reserve (HRR). The intensity determined from this session (speed and incline) was used as the recovery intensity for the high intensity sessions. The high intensity sessions were allocated in a random order from www.random.org where 1=70%, 2=80%, and 3=90%. Each high intensity session started with 10 minutes of moderate intensity exercise (at the same speed and incline from the first session) and six one minute bursts of high intensity every four minutes followed by a 10 minute cool down.

Because of the small sample size and non-normal glucose profiles, data was analyzed using a Friedman analysis of variance (non-parametric test).

Active Arm: This portion is still recruiting participants. The procedures for this experiment are very similar to the sedentary component. Blood glucose targets prior to exercise are the same however no blood samples will be taken. Participants will arrive at the lab for 4:30 PM and eat a Glucerna bar (to avoid drastic falls in glycemia with exercise). The two exercise sessions, moderate and 90%, will be allocated in a random order from a coin flip where heads is moderate exercise and tails is the 90% intervals. The moderate intensity session will consist of 45 minutes of exercise at 45-55% of HRR. The 90% session will consist of 15 minutes of moderate intensity at 45-55% of HRR followed by six one minute bursts of exercise at 90% of HRR every two minutes followed by a 10 minute cooldown.

Data will be analyzed using a general linear model and logistic regression.

연구 유형

중재적

등록 (실제)

10

단계

  • 해당 없음

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 장소

    • Manitoba
      • Winnipeg, Manitoba, 캐나다, R3E 3P4
        • Children's Hospital Research Institute of Manitoba

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

15년 (어린이, 성인)

건강한 자원 봉사자를 받아들입니다

아니

연구 대상 성별

모두

설명

Inclusion Criteria:

  • Persons with type 1 diabetes
  • Hemoglobin A1c <9.9%
  • Diabetes duration >/= 2 years
  • Sedentary Participants: participate in <150 minutes of moderate to vigorous physical activity per week
  • Active Participants: regular performance of vigorous physical activity >3 times/week for over one year. Display a maximal oxygen uptake that is at least 40.9 ml/kg/min for females, and 49.3 ml/kg/min for males.

Exclusion Criteria:

  • HbA1c ≥9.9% as the lack of compliance with insulin suggests they may not be able to comply with the prescribed exercise requirements
  • Have frequent and unpredictable hypoglycemia as they will be at a greater risk of serious hypoglycemic events
  • Had a change in insulin management strategy, including adoption of a pump within two months of enrolment or switching back to multiple daily injections in the last two months, as they may be at risk for a hypoglycemic event due to the novel insulin management approach
  • Have conditions that would render vigorous intensity activity contraindicated including: uncontrolled hypertension: BP >150 mm Hg systolic or >95 mm Hg diastolic in a sitting position; severe peripheral neuropathy; or history of cardiovascular disease
  • Cognitive deficit resulting in an inability to provide informed consent
  • Are currently taking beta-blockers as this would limit the ability to achieve target heart rates within the prescribed range
  • Are currently being treated with medications (other than insulin) that alter glucose metabolism (i.e. atypical antipsychotics, corticosteroids)
  • Are women who are pregnant, breastfeeding, or planning to get pregnant
  • Have a job or profession that involves shift work (working during the night time, and being asleep during the daytime, as this alters glucose levels.

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

  • 주 목적: 방지
  • 할당: 무작위
  • 중재 모델: 크로스오버 할당
  • 마스킹: 하나의

무기와 개입

참가자 그룹 / 팔
개입 / 치료
활성 비교기: Moderate Intensity Exercise Alone
45 minutes of moderate intensity exercise at 45-55% of maximum aerobic capacity (active participants) or heart rate reserve (sedentary participants) used as a control condition. Participants will consume a glucerna bar at 10pm following this session.
The intervention will be the different high intensity sessions. Time spent in hypoglycemia and glucose variability will be compared as follows: 70% vs. moderate, 80% vs. moderate, and 90% vs. moderate to see if high intensity is protective against hypoglycemia and provides lower glucose variability levels.
실험적: 70% Session
45 minutes of moderate intensity exercise interspersed with one minute bouts at 70% heart rate reserve every 4 minutes. Note: this session is not included for the active participants. Participants will consume a glucerna bar at 10pm following this session.
The intervention will be the different high intensity sessions. Time spent in hypoglycemia and glucose variability will be compared as follows: 70% vs. moderate, 80% vs. moderate, and 90% vs. moderate to see if high intensity is protective against hypoglycemia and provides lower glucose variability levels.
실험적: 80% Session
45 minutes of moderate intensity exercise interspersed with one minute bouts at 80% of heart rate reserve every 4 minutes. Note: this session is not included for the active participants. Participants will consume a glucerna bar at 10pm following this session.
The intervention will be the different high intensity sessions. Time spent in hypoglycemia and glucose variability will be compared as follows: 70% vs. moderate, 80% vs. moderate, and 90% vs. moderate to see if high intensity is protective against hypoglycemia and provides lower glucose variability levels.
실험적: 90% Session
45 minutes of moderate intensity exercise interspersed with one minute bouts at 90% of maximum aerobic capacity (active participants every two minutes) or heart rate reserve (sedentary participants every 4 minutes). Participants will consume a glucerna bar at 10pm following this session.
The intervention will be the different high intensity sessions. Time spent in hypoglycemia and glucose variability will be compared as follows: 70% vs. moderate, 80% vs. moderate, and 90% vs. moderate to see if high intensity is protective against hypoglycemia and provides lower glucose variability levels.

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Percent time spent </= 3.9 mmol/L as measured by continuous glucose monitor
기간: 12 hours post exercise (6:00 PM to 6:00 AM)
The time spent </= 3.9 mmol/L is measured through the continuous glucose monitor and is represented as a percentage.
12 hours post exercise (6:00 PM to 6:00 AM)

2차 결과 측정

결과 측정
측정값 설명
기간
Mean absolute glucose change (MAG-mmol/L/h) as measured by continuous glucose monitor
기간: 12 hours post exercise (6:00 PM to 6:00 AM)
Glucose variability will be measured using a continuous glucose monitor assessed through mean absolute glucose change (MAG) which is a measure of inter-day variability (mmol/L/h)
12 hours post exercise (6:00 PM to 6:00 AM)
Continuous overall net glycemic action (CONGA-mmol/L) as measured by continuous glucose monitor
기간: 12 hours post exercise (6:00 PM to 6:00 AM)
CONGA will be measured using a continuous glucose monitor assessed through overall net glycemic action (CONGA) which is a measure of intra-day variability (mmol/L).
12 hours post exercise (6:00 PM to 6:00 AM)

기타 결과 측정

결과 측정
측정값 설명
기간
Cortisol
기간: two hours post exercise
Cortisol levels are assessed to see if these values are protective against hypoglycemia. Measured by competitive immunoassay with biotinylated polyclonal antibody against cortisol. Sedentary group only.
two hours post exercise
Growth hormone
기간: two hours post exercise
Growth hormone levels are assessed to see if these values are protective against hypoglycemia. As measured by immunosorbent assay. Sedentary group only.
two hours post exercise
Muscle mass as assessed by DEXA
기간: Baseline appointment ~20 minutes
For active individuals only. Muscle mass will be measured using a DEXA scanner
Baseline appointment ~20 minutes

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

수사관

  • 수석 연구원: Jonathan McGavock, PhD, University of Manitoba; Children's Hospital Research Institute of Manitoba

간행물 및 유용한 링크

연구에 대한 정보 입력을 담당하는 사람이 자발적으로 이러한 간행물을 제공합니다. 이것은 연구와 관련된 모든 것에 관한 것일 수 있습니다.

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작

2013년 5월 1일

기본 완료 (실제)

2016년 3월 1일

연구 완료 (실제)

2016년 3월 1일

연구 등록 날짜

최초 제출

2015년 3월 18일

QC 기준을 충족하는 최초 제출

2018년 6월 27일

처음 게시됨 (실제)

2018년 7월 11일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2018년 7월 11일

QC 기준을 충족하는 마지막 업데이트 제출

2018년 6월 27일

마지막으로 확인됨

2018년 6월 1일

추가 정보

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

제1형 당뇨병에 대한 임상 시험

Exercise에 대한 임상 시험

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