Ryan A Dunn, Lauren A Fry, Yasuki Sekiguchi, Courteney L Benjamin, Ciara N Manning, Robert A Huggins, Rebecca L Stearns, Douglas J Casa
{"title":"热适应、热适应和间歇热训练对最大摄氧量的影响。","authors":"Ryan A Dunn, Lauren A Fry, Yasuki Sekiguchi, Courteney L Benjamin, Ciara N Manning, Robert A Huggins, Rebecca L Stearns, Douglas J Casa","doi":"10.1177/19417381241249470","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Maximal oxygen uptake (VO<sub>2max</sub>) is an important determinant of endurance performance. Heat acclimation/acclimatization (HA/HAz) elicits improvements in endurance performance. Upon heat exposure reduction, intermittent heat training (IHT) may alleviate HA/HAz adaptation decay; however, corresponding VO<sub>2max</sub> responses are unknown.</p><p><strong>Hypothesis: </strong>VO<sub>2max</sub> is maintained after HAz/HA; IHT mitigates decrements in aerobic power after HAz/HA.</p><p><strong>Study design: </strong>Interventional study.</p><p><strong>Level of evidence: </strong>Level 3.</p><p><strong>Methods: </strong>A total of 27 male endurance runners (mean ± SD; age, 36 ± 12 years; body mass, 73.03 ± 8.97 kg; height, 178.81 ± 6.39 cm) completed VO<sub>2max</sub> testing at 5 timepoints; baseline, post-HAz, post-HA, and weeks 4 and 8 of IHT (IHT<sub>4</sub>, IHT<sub>8</sub>). After baseline testing, participants completed HAz, preceded by 5 days of HA involving exercise to induce hyperthermia for 60 minutes in the heat (ambient temperature, 39.13 ± 1.37°C; relative humidity, 51.08 ± 8.42%). Participants were assigned randomly to 1 of 3 IHT groups: once-weekly, twice-weekly, or no IHT. Differences in VO<sub>2max</sub>, velocity at VO<sub>2max</sub> (vVO<sub>2</sub>), and maximal heart rate (HR<sub>max</sub>) at all 5 timepoints were analyzed using repeated-measure analyses of variance with Bonferroni corrections post hoc.</p><p><strong>Results: </strong>No significant VO<sub>2max</sub> or vVO<sub>2</sub> differences were observed between baseline, post-HAz, or post-HA (<i>P</i> = 0.36 and <i>P</i> = 0.09, respectively). No significant group or time effects were identified for VO<sub>2max</sub> or vVO<sub>2</sub> at post-HA, IHT<sub>4</sub>, and IHT<sub>8</sub> (<i>P</i> = 0.67 and <i>P</i> = 0.21, respectively). Significant HR<sub>max</sub> differences were observed between baseline and post-HA tests (<i>P</i> < 0.01). No significant group or time HR<sub>max</sub> differences shown for post-HA, IHT<sub>4</sub>, and IHT<sub>8</sub> (<i>P</i> = 0.59).</p><p><strong>Conclusion: </strong>VO<sub>2max</sub> was not reduced among endurance runners after HA/HAz and IHT potentially due to participants' similar aerobic training status and high aerobic fitness levels.</p><p><strong>Clinical relevance: </strong>HAz/HA and IHT maintain aerobic power in endurance runners, with HAz/HA procuring reductions in HR<sub>max</sub>.</p>","PeriodicalId":54276,"journal":{"name":"Sports Health-A Multidisciplinary Approach","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Heat Acclimatization, Heat Acclimation, and Intermittent Heat Training on Maximal Oxygen Uptake.\",\"authors\":\"Ryan A Dunn, Lauren A Fry, Yasuki Sekiguchi, Courteney L Benjamin, Ciara N Manning, Robert A Huggins, Rebecca L Stearns, Douglas J Casa\",\"doi\":\"10.1177/19417381241249470\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>Maximal oxygen uptake (VO<sub>2max</sub>) is an important determinant of endurance performance. Heat acclimation/acclimatization (HA/HAz) elicits improvements in endurance performance. Upon heat exposure reduction, intermittent heat training (IHT) may alleviate HA/HAz adaptation decay; however, corresponding VO<sub>2max</sub> responses are unknown.</p><p><strong>Hypothesis: </strong>VO<sub>2max</sub> is maintained after HAz/HA; IHT mitigates decrements in aerobic power after HAz/HA.</p><p><strong>Study design: </strong>Interventional study.</p><p><strong>Level of evidence: </strong>Level 3.</p><p><strong>Methods: </strong>A total of 27 male endurance runners (mean ± SD; age, 36 ± 12 years; body mass, 73.03 ± 8.97 kg; height, 178.81 ± 6.39 cm) completed VO<sub>2max</sub> testing at 5 timepoints; baseline, post-HAz, post-HA, and weeks 4 and 8 of IHT (IHT<sub>4</sub>, IHT<sub>8</sub>). After baseline testing, participants completed HAz, preceded by 5 days of HA involving exercise to induce hyperthermia for 60 minutes in the heat (ambient temperature, 39.13 ± 1.37°C; relative humidity, 51.08 ± 8.42%). Participants were assigned randomly to 1 of 3 IHT groups: once-weekly, twice-weekly, or no IHT. Differences in VO<sub>2max</sub>, velocity at VO<sub>2max</sub> (vVO<sub>2</sub>), and maximal heart rate (HR<sub>max</sub>) at all 5 timepoints were analyzed using repeated-measure analyses of variance with Bonferroni corrections post hoc.</p><p><strong>Results: </strong>No significant VO<sub>2max</sub> or vVO<sub>2</sub> differences were observed between baseline, post-HAz, or post-HA (<i>P</i> = 0.36 and <i>P</i> = 0.09, respectively). No significant group or time effects were identified for VO<sub>2max</sub> or vVO<sub>2</sub> at post-HA, IHT<sub>4</sub>, and IHT<sub>8</sub> (<i>P</i> = 0.67 and <i>P</i> = 0.21, respectively). Significant HR<sub>max</sub> differences were observed between baseline and post-HA tests (<i>P</i> < 0.01). No significant group or time HR<sub>max</sub> differences shown for post-HA, IHT<sub>4</sub>, and IHT<sub>8</sub> (<i>P</i> = 0.59).</p><p><strong>Conclusion: </strong>VO<sub>2max</sub> was not reduced among endurance runners after HA/HAz and IHT potentially due to participants' similar aerobic training status and high aerobic fitness levels.</p><p><strong>Clinical relevance: </strong>HAz/HA and IHT maintain aerobic power in endurance runners, with HAz/HA procuring reductions in HR<sub>max</sub>.</p>\",\"PeriodicalId\":54276,\"journal\":{\"name\":\"Sports Health-A Multidisciplinary Approach\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-05-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Sports Health-A Multidisciplinary Approach\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1177/19417381241249470\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"SPORT SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sports Health-A Multidisciplinary Approach","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1177/19417381241249470","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"SPORT SCIENCES","Score":null,"Total":0}
Effect of Heat Acclimatization, Heat Acclimation, and Intermittent Heat Training on Maximal Oxygen Uptake.
Background: Maximal oxygen uptake (VO2max) is an important determinant of endurance performance. Heat acclimation/acclimatization (HA/HAz) elicits improvements in endurance performance. Upon heat exposure reduction, intermittent heat training (IHT) may alleviate HA/HAz adaptation decay; however, corresponding VO2max responses are unknown.
Hypothesis: VO2max is maintained after HAz/HA; IHT mitigates decrements in aerobic power after HAz/HA.
Study design: Interventional study.
Level of evidence: Level 3.
Methods: A total of 27 male endurance runners (mean ± SD; age, 36 ± 12 years; body mass, 73.03 ± 8.97 kg; height, 178.81 ± 6.39 cm) completed VO2max testing at 5 timepoints; baseline, post-HAz, post-HA, and weeks 4 and 8 of IHT (IHT4, IHT8). After baseline testing, participants completed HAz, preceded by 5 days of HA involving exercise to induce hyperthermia for 60 minutes in the heat (ambient temperature, 39.13 ± 1.37°C; relative humidity, 51.08 ± 8.42%). Participants were assigned randomly to 1 of 3 IHT groups: once-weekly, twice-weekly, or no IHT. Differences in VO2max, velocity at VO2max (vVO2), and maximal heart rate (HRmax) at all 5 timepoints were analyzed using repeated-measure analyses of variance with Bonferroni corrections post hoc.
Results: No significant VO2max or vVO2 differences were observed between baseline, post-HAz, or post-HA (P = 0.36 and P = 0.09, respectively). No significant group or time effects were identified for VO2max or vVO2 at post-HA, IHT4, and IHT8 (P = 0.67 and P = 0.21, respectively). Significant HRmax differences were observed between baseline and post-HA tests (P < 0.01). No significant group or time HRmax differences shown for post-HA, IHT4, and IHT8 (P = 0.59).
Conclusion: VO2max was not reduced among endurance runners after HA/HAz and IHT potentially due to participants' similar aerobic training status and high aerobic fitness levels.
Clinical relevance: HAz/HA and IHT maintain aerobic power in endurance runners, with HAz/HA procuring reductions in HRmax.
期刊介绍：
Sports Health: A Multidisciplinary Approach is an indispensable resource for all medical professionals involved in the training and care of the competitive or recreational athlete, including primary care physicians, orthopaedic surgeons, physical therapists, athletic trainers and other medical and health care professionals.
Published bimonthly, Sports Health is a collaborative publication from the American Orthopaedic Society for Sports Medicine (AOSSM), the American Medical Society for Sports Medicine (AMSSM), the National Athletic Trainers’ Association (NATA), and the Sports Physical Therapy Section (SPTS).
The journal publishes review articles, original research articles, case studies, images, short updates, legal briefs, editorials, and letters to the editor.
Topics include:
-Sports Injury and Treatment
-Care of the Athlete
-Athlete Rehabilitation
-Medical Issues in the Athlete
-Surgical Techniques in Sports Medicine
-Case Studies in Sports Medicine
-Images in Sports Medicine
-Legal Issues
-Pediatric Athletes
-General Sports Trauma
-Sports Psychology
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
