Heart Rate Recovery Responses to Graded Exercise Testing in Healthy-Weight versus Obese Boys and Girls

The primary aims of this paper were (1) to evaluate the influence of intensive lifestyle weight loss and exercise intervention (ILI) compared with diabetes support and education (DSE) upon Heart Rate Recovery (HRR) from graded exercise testing (GXT) and (2) to determine the independent and combined effects of weight loss and fitness changes upon HRR. In 4503 participants (45–76 years) who completed 1 year of intervention, HRR was measured after a submaximal GXT to compare the influence of (ILI) with (DSE) upon HRR. Participants assigned to ILI lost an average 8.6% of their initial weight versus 0.7% in DSE group (P<0.001) while mean fitness increased in ILI by 20.9% versus 5.8% in DSE (P<0.001). At Year 1, all exercise and HRR variables in ILI improved (P<0.0001) versus DSE: heart rate (HR) at rest was lower (72.8±11.4versus77.7±11.7 b/min), HR range was greater (57.7±12.1versus53.1±12.4 b/min), HR at 2 minutes was lower (89.3±21.8versus93.0±12.1 b/min), and HRR was greater (41.25±22.0versus37.8±12.5 b/min). Weight loss and fitness gain produced significant separate and independent improvements in HRR.

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Comparison of on-ice and off-ice graded exercise testing in collegiate hockey players

Applied Physiology Nutrition and Metabolism ◽

10.1139/h09-129 ◽

2010 ◽

Vol 35 (1) ◽

pp. 35-39 ◽

Cited By ~ 13

Author(s):

John J. Durocher ◽

Angela J. Guisfredi ◽

Darin T. Leetun ◽

Jason R. Carter

Keyword(s):

Heart Rate ◽

Exercise Testing ◽

Aerobic Capacity ◽

Cycle Ergometry ◽

National Hockey League ◽

Maximal Heart Rate ◽

Graded Exercise Testing ◽

Hockey Players ◽

Graded Exercise ◽

Specific Manner

The purpose of this study was to compare lactate thresholds (LT) and maximal aerobic capacities (VO2 max) during sport-specific skating (on ice) and cycle ergometry (off ice) in collegiate hockey players. We hypothesized that VO2 max and LT would be higher on ice. We also sought to determine if on-ice and off-ice VO2 max values were correlated. Twelve collegiate hockey players performed both graded exercise protocols in randomized order to fatigue. Both protocols included 80 s of work during each stage, followed by 40 s of rest to allow for blood lactate sampling. VO2 max was significantly higher on ice (46.9 ± 1.0 mL·kg–1·min–1) than off ice (43.6 ± 0.9 mL·kg–1·min–1; p < 0.05). Maximal heart rate (HRmax) was also higher on ice (192.2 ± 1.8 beats·min–1) than off ice (186.0 ± 1.5 beats·min–1; p < 0.01). LT was drastically higher on ice than off ice as a percentage of VO2 max (85.9% ± 1.9% vs. 69.7% ± 1.3%; p < 0.01) and HRmax (90.1% ± 1.3% vs. 79.4% ± 1.6%; p < 0.01). Finally, no correlation existed between VO2 max values off ice and on ice (r = –0.002; p = 0.99). Our results indicate that off-ice VO2 max and LT are not adequate predictors of on-ice VO2 max and LT in collegiate hockey players. These findings challenge the use of cycle ergometry to assess aerobic capacity at events such as the National Hockey League Entry Draft combine. We suggest that hockey players be tested in a sport-specific manner, regardless of whether those tests are performed on ice or off ice.

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