HIIT produces increases in muscle power and free testosterone in male masters athletes

Herbert, Peter N.; Hayes, Lawrence D.; Sculthorpe, Nicholas; Grace, Fergal

doi:10.1530/ec-17-0159

Cited by 39 publications

(37 citation statements)

References 36 publications

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“…This may indicate that aerobic HIIT could be effective in increasing leg muscle strength. This is in line with HIIT research in healthy populations which demonstrated an increase in muscle strength following a HIIT cycling intervention (Herbert et al, 2017;Wright et al, 2016). As working muscles at a higher intensity produces greater increases in strength (Garber et al, 2011), the increase in strength from HIIT is likely induced from cycling at a higher workrate during the high intensity intervals, compared to continuous moderate intensity training.…”

Section: Mssupporting

confidence: 83%

High intensity interval training for people with multiple sclerosis: A systematic review

Campbell

Coulter

Paul

2018

Multiple Sclerosis and Related Disorders

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Section: Mssupporting

confidence: 83%

High intensity interval training for people with multiple sclerosis: A systematic review

Campbell

Coulter

Paul

2018

Multiple Sclerosis and Related Disorders

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“…A further issue is the heterogeneity of exercise training design. When two studies used the same exercise intervention, for the same duration, free-T and TT responses were remarkably similar considering sedentary older men were compared to masters athletes (Hayes et al, 2017a; Herbert et al, 2017a). As such, it is possible the exercise intervention specifics (volume, intensity, frequency, etc.)…”

Section: Discussionmentioning

confidence: 92%

“…The two included interval training studies displayed a positive testosterone SDM, with both investigations coming from the same research group (Hayes et al, 2017a; Herbert et al, 2017a). This group used the same high intensity interval training (HIIT) in both studies, which consisted of 6 × 30 s sprints at 40% peak power output (~130% peak oxygen uptake) interspersed with 3 min rest.…”

Section: Discussionmentioning

confidence: 99%

Short-Term Exercise Training Inconsistently Influences Basal Testosterone in Older Men: A Systematic Review and Meta-Analysis

Hayes

Elliott

2019

Front. Physiol.

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Background: The age-associated decrease in testosterone is one mechanism suggested to accelerate the aging process in males. Therefore, approaches to increase endogenous testosterone may be of benefit. The aim of this paper was to undertake a Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA)-accordant meta-analysis concerning the effect of exercise on total (TT), bioavailable (bio-T), free (free-T), and salivary (sal-T) testosterone in older males.Methods: Databases were searched up to and including 20th February 2018 for the terms “testosterone AND exercise AND aging AND males,” “testosterone AND exercise AND old AND males,” “testosterone AND training AND aging AND males,” and “testosterone AND training AND old AND males”. From 1259 originally identified titles, 22 studies (randomized controlled trials; RCTs; n = 9, and uncontrolled trials; UCTs; n = 13) were included which had a training component, participants ≥60 years of age, and salivary or serum testosterone as an outcome measure. Meta-analyses were conducted on change to testosterone following training using standardized difference in means (SDM) and random effects models.Results: The overall SDM for endurance training, resistance training, and interval training was 0.398 (95% CI = 0.034–0.761; P = 0.010), −0.003 (95% CI = −0.330–0.324; P = 0.986), and 0.283 (95% CI = 0.030–0.535; P = 0.028), respectively. Resistance training exhibited a qualitative effect of hormone fraction whereby free-T resulted in the greatest SDM (0.253; 95% CI = −0.043–0.549; P = 0.094), followed by TT (0.028; 95% CI = −0.204–0.260; P = 0.813), and resistance training negatively influenced bio-T (−0.373; 95% CI = −0.789–0.042; P = 0.078). Due to the small number of studies, subgroup analysis was not possible for endurance training and interval training studies.Conclusions: Data from the present investigation suggests that resistance training does not significantly influence basal testosterone in older men. Magnitude of effect was influenced by hormone fraction, even within the same investigation. Aerobic training and interval training did result in small, significant increases in basal testosterone. The magnitude of effect is small but the existing data are encouraging and may be an avenue for further research.

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“…The high-volume and high-intensity protocols with short rest intervals between sets tended to lead to greater hormonal changes (Kraemer and Ratamess, 2005 ). Previous studies have reported a significant increase in testosterone levels after high-intensity exercises in runners and master athletes of various modalities (Herbert et al, 2017 ; Nuuttila et al, 2017 ). Women did not present significant chronic testosterone and cortisol changes (Poderoso et al, 2019 ).…”

Section: Discussionmentioning

confidence: 94%

Characterization of Hormonal, Metabolic, and Inflammatory Responses in CrossFit® Training: A Systematic Review

Jacob¹,

Novaes

Behm

et al. 2020

Front. Physiol.

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Background: CrossFit® training is a high-intensity functional training program that aims to increase physical functional performance through biochemical responses, i.e., hormonal, metabolic, and inflammatory responses. Most hormonal, metabolic, and inflammatory changes induced by CrossFit® training have been reported in isolated clinical studies. The purpose of this review was to systematically explore the existing literature on characterization of hormonal, metabolic, and inflammatory responses resulting from CrossFit® training. Methods: A systematic search of the literature was conducted in PubMed, Web of Science and Scopus from August 2019 to October 2019. Studies were selected through critical review of the content. Using specific keywords, 623 articles were found, of which 597 were excluded for ineligibility, and 25 were eligible. The papers were separated according to subject area: hormonal ( n = 8), metabolic ( n = 19), and inflammatory ( n = 6) changes. All were published between 2015 and 2019. Results: This review reveals potential effects of CrossFit® training on hormonal, metabolic, and inflammatory responses. However, studies had low levels of evidence and reliability due to methodological limitations. Conclusion: In summary, the results showed a greater volume and intensity of workouts accentuate the responses, that are of paramount importance for improving understanding of the effects of CrossFit ® training and serve as a basis for prescribing future exercise protocols.

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HIIT produces increases in muscle power and free testosterone in male masters athletes

Cited by 39 publications

References 36 publications

High intensity interval training for people with multiple sclerosis: A systematic review

High intensity interval training for people with multiple sclerosis: A systematic review

Short-Term Exercise Training Inconsistently Influences Basal Testosterone in Older Men: A Systematic Review and Meta-Analysis

Characterization of Hormonal, Metabolic, and Inflammatory Responses in CrossFit® Training: A Systematic Review

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