The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance
Background Keratins are structural, thiol-rich proteins, which comprise 90% of total poultry feather weight. Their favourable amino acid profile suggests the potential for use as a protein source and ergogenic aid for endurance athletes, following treatment to increase digestibility. This study inve...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2018-09-01
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| Series: | Journal of the International Society of Sports Nutrition |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1186/s12970-018-0251-x |
| _version_ | 1797684994433351680 |
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| author | Emma M. Crum Yanita D. McLeay Matthew J. Barnes Stephen R. Stannard |
| author_facet | Emma M. Crum Yanita D. McLeay Matthew J. Barnes Stephen R. Stannard |
| author_sort | Emma M. Crum |
| collection | DOAJ |
| description | Background Keratins are structural, thiol-rich proteins, which comprise 90% of total poultry feather weight. Their favourable amino acid profile suggests the potential for use as a protein source and ergogenic aid for endurance athletes, following treatment to increase digestibility. This study investigated whether 4 weeks of soluble keratin (KER) consumption (0.8 g/kg bodyweight/day) by 15 endurance-trained males would have favourable effects on body composition, blood and cardiorespiratory variables, and cycling performance, compared to casein protein (CAS). Methods Supplementation was randomized, blinded and balanced, with a minimum eight-week washout period between trials. An exercise test to measure oxygen consumption during submaximal and maximal cycling exercise was completed at the start at and end of each intervention. Anthropometric (DEXA) and blood measures were made prior to and following each intervention period. Results Total body mass and percentage body fat did not change significantly (p > 0.05). However, a significantly greater increase in bone-free lean mass (LM) occurred with KER compared to CAS (0.88 kg vs 0.07 kg; p < 0.05). While no change in LM was evident for the trunk and arms, leg LM increased (0.45 ± 0.54 kg; p = 0.006) from baseline with KER. KER was not associated with changes in blood parameters, oxygen consumption, or exercise performance (p > 0.05). Conclusions These data suggest that KER is not useful as an ergogenic aid for endurance athletes but may be a suitable protein supplement for maximizing increases in lean body mass. |
| first_indexed | 2024-03-12T00:37:56Z |
| format | Article |
| id | doaj.art-1abc6cab50784b86845fdd0aee76bed4 |
| institution | Directory Open Access Journal |
| issn | 1550-2783 |
| language | English |
| last_indexed | 2024-03-12T00:37:56Z |
| publishDate | 2018-09-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of the International Society of Sports Nutrition |
| spelling | doaj.art-1abc6cab50784b86845fdd0aee76bed42023-09-15T09:19:30ZengTaylor & Francis GroupJournal of the International Society of Sports Nutrition1550-27832018-09-0115110.1186/s12970-018-0251-x12130064The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performanceEmma M. Crum0Yanita D. McLeay1Matthew J. Barnes2Stephen R. Stannard3School of Sport and ExerciseSchool of Sport and ExerciseSchool of Sport and ExerciseSchool of Sport and ExerciseBackground Keratins are structural, thiol-rich proteins, which comprise 90% of total poultry feather weight. Their favourable amino acid profile suggests the potential for use as a protein source and ergogenic aid for endurance athletes, following treatment to increase digestibility. This study investigated whether 4 weeks of soluble keratin (KER) consumption (0.8 g/kg bodyweight/day) by 15 endurance-trained males would have favourable effects on body composition, blood and cardiorespiratory variables, and cycling performance, compared to casein protein (CAS). Methods Supplementation was randomized, blinded and balanced, with a minimum eight-week washout period between trials. An exercise test to measure oxygen consumption during submaximal and maximal cycling exercise was completed at the start at and end of each intervention. Anthropometric (DEXA) and blood measures were made prior to and following each intervention period. Results Total body mass and percentage body fat did not change significantly (p > 0.05). However, a significantly greater increase in bone-free lean mass (LM) occurred with KER compared to CAS (0.88 kg vs 0.07 kg; p < 0.05). While no change in LM was evident for the trunk and arms, leg LM increased (0.45 ± 0.54 kg; p = 0.006) from baseline with KER. KER was not associated with changes in blood parameters, oxygen consumption, or exercise performance (p > 0.05). Conclusions These data suggest that KER is not useful as an ergogenic aid for endurance athletes but may be a suitable protein supplement for maximizing increases in lean body mass.http://dx.doi.org/10.1186/s12970-018-0251-xdietary proteinexerciseskeletal muscleergogenic aidperformancedexa |
| spellingShingle | Emma M. Crum Yanita D. McLeay Matthew J. Barnes Stephen R. Stannard The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance Journal of the International Society of Sports Nutrition dietary protein exercise skeletal muscle ergogenic aid performance dexa |
| title | The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance |
| title_full | The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance |
| title_fullStr | The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance |
| title_full_unstemmed | The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance |
| title_short | The effect of chronic soluble keratin supplementation in physically active individuals on body composition, blood parameters and cycling performance |
| title_sort | effect of chronic soluble keratin supplementation in physically active individuals on body composition blood parameters and cycling performance |
| topic | dietary protein exercise skeletal muscle ergogenic aid performance dexa |
| url | http://dx.doi.org/10.1186/s12970-018-0251-x |
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