Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue
Both the quantity and quality of pre-exercise carbohydrate (CHO) meals have been shown to improve endurance performance. However, their role in attenuating central fatigue (CF) is inconclusive. The use of neurophysiological techniques, such as voluntary activation (VA) and the central activation rat...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Published: |
American Physiological Society
2018
|
| Subjects: |
| _version_ | 1796961471976964096 |
|---|---|
| author | Khong, Teng Keen Selvanayagam, Victor Selvarajah Hamzah, Sareena Hanim Yusof, Ashril |
| author_facet | Khong, Teng Keen Selvanayagam, Victor Selvarajah Hamzah, Sareena Hanim Yusof, Ashril |
| author_sort | Khong, Teng Keen |
| collection | UM |
| description | Both the quantity and quality of pre-exercise carbohydrate (CHO) meals have been shown to improve endurance performance. However, their role in attenuating central fatigue (CF) is inconclusive. The use of neurophysiological techniques, such as voluntary activation (VA) and the central activation ratio (CAR), alongside maximum voluntary contraction (MVC) and sustained MVC (sMVC) can provide information on CF. Hence, the objective of this study was to investigate the effects of isocaloric pre-exercise meals: 1) a high versus low quantity of CHO and 2) a high quantity of CHO with a high versus low glycemic index (GI) on MVC, VA, and CAR following a 90-min run. The high and low quantity of CHO was 1.5 and 0.8 g/kg body wt, respectively, and high and low GI was ∼75 and ∼40, respectively. Blood insulin, serotonin, tryptophan, and gaseous exchange were also measured. High CHO preserved sMVC, VA, CAR, and serotonin postrunning with greater CHO oxidation and insulin response, whereas in low CHO, greater reductions in sMVC, VA, and CAR were accompanied by higher serotonin and fat oxidation with lower insulin response. These observations indicate central involvements. Meanwhile, high GI CHO better preserved force (sMVC), CAR, and tryptophan with greater CHO oxidation and insulin respons.compared with low GI. The findings of this study suggest that pre-exercise meals with varying quantity and quality of CHO can have an effect on CF, where greater CHO oxidation and insulin response found in both high CHO and high GI lead to attenuation of CF. NEW & NOTEWORTHY This paper examined the effects of carbohydrate interventions (high and low: Quantity and quality wise) on central activity during prolonged exercise using mainly neurophysiological techniques along with gaseous exchange and blood insulin, serotonin, and tryptophan data. |
| first_indexed | 2024-03-06T05:54:36Z |
| format | Article |
| id | um.eprints-21611 |
| institution | Universiti Malaya |
| last_indexed | 2024-03-06T05:54:36Z |
| publishDate | 2018 |
| publisher | American Physiological Society |
| record_format | dspace |
| spelling | um.eprints-216112019-07-15T04:30:13Z http://eprints.um.edu.my/21611/ Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue Khong, Teng Keen Selvanayagam, Victor Selvarajah Hamzah, Sareena Hanim Yusof, Ashril GV Recreation Leisure Both the quantity and quality of pre-exercise carbohydrate (CHO) meals have been shown to improve endurance performance. However, their role in attenuating central fatigue (CF) is inconclusive. The use of neurophysiological techniques, such as voluntary activation (VA) and the central activation ratio (CAR), alongside maximum voluntary contraction (MVC) and sustained MVC (sMVC) can provide information on CF. Hence, the objective of this study was to investigate the effects of isocaloric pre-exercise meals: 1) a high versus low quantity of CHO and 2) a high quantity of CHO with a high versus low glycemic index (GI) on MVC, VA, and CAR following a 90-min run. The high and low quantity of CHO was 1.5 and 0.8 g/kg body wt, respectively, and high and low GI was ∼75 and ∼40, respectively. Blood insulin, serotonin, tryptophan, and gaseous exchange were also measured. High CHO preserved sMVC, VA, CAR, and serotonin postrunning with greater CHO oxidation and insulin response, whereas in low CHO, greater reductions in sMVC, VA, and CAR were accompanied by higher serotonin and fat oxidation with lower insulin response. These observations indicate central involvements. Meanwhile, high GI CHO better preserved force (sMVC), CAR, and tryptophan with greater CHO oxidation and insulin respons.compared with low GI. The findings of this study suggest that pre-exercise meals with varying quantity and quality of CHO can have an effect on CF, where greater CHO oxidation and insulin response found in both high CHO and high GI lead to attenuation of CF. NEW & NOTEWORTHY This paper examined the effects of carbohydrate interventions (high and low: Quantity and quality wise) on central activity during prolonged exercise using mainly neurophysiological techniques along with gaseous exchange and blood insulin, serotonin, and tryptophan data. American Physiological Society 2018 Article PeerReviewed Khong, Teng Keen and Selvanayagam, Victor Selvarajah and Hamzah, Sareena Hanim and Yusof, Ashril (2018) Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue. Journal of Applied Physiology, 125 (4). pp. 1021-1029. ISSN 8750-7587, DOI https://doi.org/10.1152/japplphysiol.00221.2018 <https://doi.org/10.1152/japplphysiol.00221.2018>. https://doi.org/10.1152/japplphysiol.00221.2018 doi:10.1152/japplphysiol.00221.2018 |
| spellingShingle | GV Recreation Leisure Khong, Teng Keen Selvanayagam, Victor Selvarajah Hamzah, Sareena Hanim Yusof, Ashril Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title | Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title_full | Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title_fullStr | Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title_full_unstemmed | Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title_short | Effect of quantity and quality of pre-exercise carbohydrate meals on central fatigue |
| title_sort | effect of quantity and quality of pre exercise carbohydrate meals on central fatigue |
| topic | GV Recreation Leisure |
| work_keys_str_mv | AT khongtengkeen effectofquantityandqualityofpreexercisecarbohydratemealsoncentralfatigue AT selvanayagamvictorselvarajah effectofquantityandqualityofpreexercisecarbohydratemealsoncentralfatigue AT hamzahsareenahanim effectofquantityandqualityofpreexercisecarbohydratemealsoncentralfatigue AT yusofashril effectofquantityandqualityofpreexercisecarbohydratemealsoncentralfatigue |