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| Name | Class |
|---|---|
| Queen's University | OTHER |
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The purpose of this study is to compare the impact of augmenting exercise intensity and augmenting exercise frequency on peak work rate. Participants will complete exercise tests and provide 8 skeletal muscle samples following a within-subjects randomized crossover design utilizing single-leg cycling. Both training periods will be 4 weeks long and skeletal muscle biopsies will be collected from both legs before and after each training period. All exercise sessions will be supervised, take place in the investigator's laboratory, and occur on stationary bikes.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Frequency then Intensity | Experimental | Training period 1: Frequency comparison Training period 2: Intensity comparison |
|
| Intensity then Frequency | Experimental | Training period 1: Intensity comparison Training period 2: Frequency comparison |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Frequency comparison | Behavioral | One leg assigned to low-frequency low-intensity (3 days per week of 11 x 1 min @ 73% peak work rate interspersed with 1-minute periods of active recovery). The other leg assigned to high-frequency low-intensity (5 days per week of 11 x 1 min @ 73% peak work rate interspersed with 1-minute periods of active recovery). |
| Measure | Description | Time Frame |
|---|---|---|
| Peak work rate | Change in Highest work rate achieved (30s period) during incremental exercise tests | Before exercise training on two days (~7 and 6 days before first training session; ~24 hours apart), and after exercise on two days (~48-96 hours after the last training session; ~24 hours apart) |
| Measure | Description | Time Frame |
|---|---|---|
| Peak oxygen uptake | Change in Highest oxygen uptake achieved (30s period) during incremental exercise tests | Before exercise training on two days (~7 and 6 days before first training session; ~24 hours apart), and after exercise on two days (~48-96 hours after the last training session; ~24 hours apart) |
| Maximal citrate synthase activity |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Brendon J Gurd, PhD | Queen's University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Queen's Muscle Physiology Lab in the School of Kinesiology and Health Studies at Queen's University | Kingston | Ontario | K7L 3N6 | Canada |
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| Intensity comparison | Behavioral | One leg assigned to low-frequency low-intensity (3 days per week of 11 x 1 min @ 73% peak work rate interspersed with 1-minute periods of active recovery). The other leg assigned to low-frequency high-intensity (3 days per week of 8 x 1 min @ 100% peak work rate interspersed with 1-minute periods of active recovery). |
|
Change in maximal citrate synthase activity |
| Before exercise training (~7 days before first training session), and after exercise training (~48-72 hours after the last training session) |