The Effect of Dietary Nitrate on the Physiological Responses to 3-Weeks Sprint Interval Training

David Muggeridge, Chris Easton

Research output: Contribution to journalMeeting Abstract

Abstract

Dietary nitrate (NIT) supplementation has been shown to increase nitric oxide (NO) metabolites and enhance exercise performance. Sprint interval training (SIT) has been shown to improve aerobic fitness following 2-4 weeks of training. Considering NIT has been shown to enhance intermittent high intensity exercise the addition of NIT prior to SIT may enhance the physiological changes in aerobic fitness.PURPOSE: To investigate whether dietary nitrate ingested prior to SIT can enhance the physiological adaptations to SIT.METHODS: 27 participants completed an initial incremental ramp exercise test to exhaustion (IXT) for determination of VO2max, HRmax and WRmax. Participants were subsequently randomly assigned to a control group (CONT; n=8), SIT + placebo (PLA) group (n=10) or a SIT + NIT group (n=9) and were matched based on VO2max. Participants in each of the SIT groups then underwent 3-weeks of SIT consisting of 4-6 repeated 15 s all out sprints on a cycle ergometer, interspersed with 4 min active recovery. Participants consumed either a NIT or PLA dose 2.5 h prior to each training session. The dose consisted of 2 x 60 ml nitrate gels (∼8.1 mmol nitrate) or NIT-depleted PLA. In the control group participants were asked to maintain their normal lifestyle throughout the 3 week training period. Upon completion of the SIT protocol or CONT condition all participants repeated the initial IXT 48 h following the final training session. Differences between groups, time points and their interaction were established by mixed methods repeated measures ANOVA.RESULTS: There were no differences in VO2max prior to training (CONT: 44.8 ± 8.1, SIT + PLA: 40.6 ± 7.3, SIT + NIT: 42.3 ± 6.6 ml•kg•min-1, P=0.494) but VO2max improved pre - post training (P=0.019). Post-hoc analysis revealed changes in VO2max occurred in the SIT + NIT group (45.1 ± 9.3 ml•kg•min-1, 6.7 %, P=0.026) but not the SIT + PLA (42.5 ± 5 ml•kg•min-1, 4.7 %, P=0.097) or CONT groups (45.2 ± 7.8 ml•kg•min-1, 1 %, P=0.738). WRmax improved from pre - post training in both SIT groups (PLA: 274 ± 42 - 287 ± 42 W, P=0.006, NIT: 286 ± 47 - 314 ± 55 W, P<0.001) however no changes were seen in the CONT group (291 ± 60 - 287 ± 63 W, P=0.352).CONCLUSIONS: Results from the current study suggest that NIT may enhance the aerobic adaptations to SIT however the mechanism underpinning this response is currently unknown.
Original languageEnglish
Pages (from-to)187-187
JournalMedicine & Science in Sports & Exercise
Volume47
Issue number5S
Publication statusPublished - 2015

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Nitrates
Placebos
High-Intensity Interval Training
Physiological Adaptation
Control Groups
Architectural Accessibility
Dietary Supplements
Exercise Test
Life Style
Analysis of Variance
Nitric Oxide

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@article{68c99df17d204de58c60894019027bb0,
title = "The Effect of Dietary Nitrate on the Physiological Responses to 3-Weeks Sprint Interval Training",
abstract = "Dietary nitrate (NIT) supplementation has been shown to increase nitric oxide (NO) metabolites and enhance exercise performance. Sprint interval training (SIT) has been shown to improve aerobic fitness following 2-4 weeks of training. Considering NIT has been shown to enhance intermittent high intensity exercise the addition of NIT prior to SIT may enhance the physiological changes in aerobic fitness.PURPOSE: To investigate whether dietary nitrate ingested prior to SIT can enhance the physiological adaptations to SIT.METHODS: 27 participants completed an initial incremental ramp exercise test to exhaustion (IXT) for determination of VO2max, HRmax and WRmax. Participants were subsequently randomly assigned to a control group (CONT; n=8), SIT + placebo (PLA) group (n=10) or a SIT + NIT group (n=9) and were matched based on VO2max. Participants in each of the SIT groups then underwent 3-weeks of SIT consisting of 4-6 repeated 15 s all out sprints on a cycle ergometer, interspersed with 4 min active recovery. Participants consumed either a NIT or PLA dose 2.5 h prior to each training session. The dose consisted of 2 x 60 ml nitrate gels (∼8.1 mmol nitrate) or NIT-depleted PLA. In the control group participants were asked to maintain their normal lifestyle throughout the 3 week training period. Upon completion of the SIT protocol or CONT condition all participants repeated the initial IXT 48 h following the final training session. Differences between groups, time points and their interaction were established by mixed methods repeated measures ANOVA.RESULTS: There were no differences in VO2max prior to training (CONT: 44.8 ± 8.1, SIT + PLA: 40.6 ± 7.3, SIT + NIT: 42.3 ± 6.6 ml•kg•min-1, P=0.494) but VO2max improved pre - post training (P=0.019). Post-hoc analysis revealed changes in VO2max occurred in the SIT + NIT group (45.1 ± 9.3 ml•kg•min-1, 6.7 {\%}, P=0.026) but not the SIT + PLA (42.5 ± 5 ml•kg•min-1, 4.7 {\%}, P=0.097) or CONT groups (45.2 ± 7.8 ml•kg•min-1, 1 {\%}, P=0.738). WRmax improved from pre - post training in both SIT groups (PLA: 274 ± 42 - 287 ± 42 W, P=0.006, NIT: 286 ± 47 - 314 ± 55 W, P<0.001) however no changes were seen in the CONT group (291 ± 60 - 287 ± 63 W, P=0.352).CONCLUSIONS: Results from the current study suggest that NIT may enhance the aerobic adaptations to SIT however the mechanism underpinning this response is currently unknown.",
author = "David Muggeridge and Chris Easton",
year = "2015",
language = "English",
volume = "47",
pages = "187--187",
journal = "Medicine & Science in Sports & Exercise",
issn = "0195-9131",
publisher = "American College of Sports Medicine",
number = "5S",

}

The Effect of Dietary Nitrate on the Physiological Responses to 3-Weeks Sprint Interval Training. / Muggeridge, David; Easton, Chris.

In: Medicine & Science in Sports & Exercise, Vol. 47, No. 5S, 2015, p. 187-187.

Research output: Contribution to journalMeeting Abstract

TY - JOUR

T1 - The Effect of Dietary Nitrate on the Physiological Responses to 3-Weeks Sprint Interval Training

AU - Muggeridge, David

AU - Easton, Chris

PY - 2015

Y1 - 2015

N2 - Dietary nitrate (NIT) supplementation has been shown to increase nitric oxide (NO) metabolites and enhance exercise performance. Sprint interval training (SIT) has been shown to improve aerobic fitness following 2-4 weeks of training. Considering NIT has been shown to enhance intermittent high intensity exercise the addition of NIT prior to SIT may enhance the physiological changes in aerobic fitness.PURPOSE: To investigate whether dietary nitrate ingested prior to SIT can enhance the physiological adaptations to SIT.METHODS: 27 participants completed an initial incremental ramp exercise test to exhaustion (IXT) for determination of VO2max, HRmax and WRmax. Participants were subsequently randomly assigned to a control group (CONT; n=8), SIT + placebo (PLA) group (n=10) or a SIT + NIT group (n=9) and were matched based on VO2max. Participants in each of the SIT groups then underwent 3-weeks of SIT consisting of 4-6 repeated 15 s all out sprints on a cycle ergometer, interspersed with 4 min active recovery. Participants consumed either a NIT or PLA dose 2.5 h prior to each training session. The dose consisted of 2 x 60 ml nitrate gels (∼8.1 mmol nitrate) or NIT-depleted PLA. In the control group participants were asked to maintain their normal lifestyle throughout the 3 week training period. Upon completion of the SIT protocol or CONT condition all participants repeated the initial IXT 48 h following the final training session. Differences between groups, time points and their interaction were established by mixed methods repeated measures ANOVA.RESULTS: There were no differences in VO2max prior to training (CONT: 44.8 ± 8.1, SIT + PLA: 40.6 ± 7.3, SIT + NIT: 42.3 ± 6.6 ml•kg•min-1, P=0.494) but VO2max improved pre - post training (P=0.019). Post-hoc analysis revealed changes in VO2max occurred in the SIT + NIT group (45.1 ± 9.3 ml•kg•min-1, 6.7 %, P=0.026) but not the SIT + PLA (42.5 ± 5 ml•kg•min-1, 4.7 %, P=0.097) or CONT groups (45.2 ± 7.8 ml•kg•min-1, 1 %, P=0.738). WRmax improved from pre - post training in both SIT groups (PLA: 274 ± 42 - 287 ± 42 W, P=0.006, NIT: 286 ± 47 - 314 ± 55 W, P<0.001) however no changes were seen in the CONT group (291 ± 60 - 287 ± 63 W, P=0.352).CONCLUSIONS: Results from the current study suggest that NIT may enhance the aerobic adaptations to SIT however the mechanism underpinning this response is currently unknown.

AB - Dietary nitrate (NIT) supplementation has been shown to increase nitric oxide (NO) metabolites and enhance exercise performance. Sprint interval training (SIT) has been shown to improve aerobic fitness following 2-4 weeks of training. Considering NIT has been shown to enhance intermittent high intensity exercise the addition of NIT prior to SIT may enhance the physiological changes in aerobic fitness.PURPOSE: To investigate whether dietary nitrate ingested prior to SIT can enhance the physiological adaptations to SIT.METHODS: 27 participants completed an initial incremental ramp exercise test to exhaustion (IXT) for determination of VO2max, HRmax and WRmax. Participants were subsequently randomly assigned to a control group (CONT; n=8), SIT + placebo (PLA) group (n=10) or a SIT + NIT group (n=9) and were matched based on VO2max. Participants in each of the SIT groups then underwent 3-weeks of SIT consisting of 4-6 repeated 15 s all out sprints on a cycle ergometer, interspersed with 4 min active recovery. Participants consumed either a NIT or PLA dose 2.5 h prior to each training session. The dose consisted of 2 x 60 ml nitrate gels (∼8.1 mmol nitrate) or NIT-depleted PLA. In the control group participants were asked to maintain their normal lifestyle throughout the 3 week training period. Upon completion of the SIT protocol or CONT condition all participants repeated the initial IXT 48 h following the final training session. Differences between groups, time points and their interaction were established by mixed methods repeated measures ANOVA.RESULTS: There were no differences in VO2max prior to training (CONT: 44.8 ± 8.1, SIT + PLA: 40.6 ± 7.3, SIT + NIT: 42.3 ± 6.6 ml•kg•min-1, P=0.494) but VO2max improved pre - post training (P=0.019). Post-hoc analysis revealed changes in VO2max occurred in the SIT + NIT group (45.1 ± 9.3 ml•kg•min-1, 6.7 %, P=0.026) but not the SIT + PLA (42.5 ± 5 ml•kg•min-1, 4.7 %, P=0.097) or CONT groups (45.2 ± 7.8 ml•kg•min-1, 1 %, P=0.738). WRmax improved from pre - post training in both SIT groups (PLA: 274 ± 42 - 287 ± 42 W, P=0.006, NIT: 286 ± 47 - 314 ± 55 W, P<0.001) however no changes were seen in the CONT group (291 ± 60 - 287 ± 63 W, P=0.352).CONCLUSIONS: Results from the current study suggest that NIT may enhance the aerobic adaptations to SIT however the mechanism underpinning this response is currently unknown.

M3 - Meeting Abstract

VL - 47

SP - 187

EP - 187

JO - Medicine & Science in Sports & Exercise

JF - Medicine & Science in Sports & Exercise

SN - 0195-9131

IS - 5S

ER -