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Exercise capacity and exercise-induced bronchoconstriction (EIB) in a cold environment.

Stensrud T, Berntsen S, Carlsen KH

Respir Med. 2007 Feb 19;

Introduction: Exercise in a cold environment has been reported to increase exercise-induced bronchoconstriction (EIB). However, the effect of a cold environment upon exercise capacity in subjects with EIB has, to our knowledge, not been previously reported.

Purpose:

Primary: To examine the influence of changing environmental temperature upon exercise capacity measured by peak oxygen uptake (V O(2peak)), peak ventilation (V E(peak)) and peak running speed in subjects with diagnosed EIB.

Secondary: To assess the influence of changing environmental temperature upon EIB.

Methods: Twenty subjects (10-45 years old, male/female: 13/7) with EIB underwent exercise testing by running on a treadmill in a climate chamber under standardised, regular conditions, 20.2 degrees C (+/-1.1) and 40.0% (+/-3.3) relative humidity [mean(+/-SD)], and in a standardised cold environment, -18.0 degrees C (+/-1.4) and 39.2% (+/-3.8) relative humidity in random order on separate days. Oxygen uptake (V O(2)), minute ventilation (V E), respiratory exchange ratio (RER), heart rate (HR) and running speed were measured during exercise. Lung function (flow volume loops) was measured before and 1, 3, 6, 10 and 15min after exercise and 15min after inhalation of salbutamol.

Results: V O(2peak) decreased 6.5%, from 47.9 (45.0, 50.8) to 44.8mlkg(-1)min(-1) (41.2, 48.4) [mean (95% confidence intervals)] (p=0.004) in the cold environment. Also running speed was significantly lower in the cold environment (p=0.02). No differences were found for V E(peak), RER(peak) or HR(peak.) The post-exercise reduction in forced expiratory volume in 1s (FEV(1)) (DeltaFEV(1)) increased significantly from 24% (19,29) to 31% (24,38), respectively (p=0.04) after exercise in the cold environment. No correlation was found between reduction in V O(2peak) and the increased maximum fall in FEV(1) in the cold environment.

Conclusion: Exercise capacity (V O(2peak) and peak running speed) was markedly reduced during exercise in a cold environment whereas EIB increased in subjects suffering from EIB.

From HubMed Abstracts

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Susan Leining ran her first 5-kilometer run on Saturday, and the Santa Fe High School girls soccer coach didn’t do too bad for a first-timer. Leining completed the Mardi Gras Beach Run 5k in 39 minutes, 38.9 seconds Saturday in Galveston.

Leining, 49, finished 16th in the women’s ages 45 to 49 age division.

“I felt really good,” Leining said. “When I finished, I felt like I had won the marathon. I felt really satisfied. Since I sprinted that last half mile, I couldn’t breathe, but I felt really good. I felt like I’d challenged myself and met my challenge. Now I’m looking for my next one.”

Leining, who admits she hates running, decided to take up the sport in honor of a former student, Chelsey Campbell.

Campbell was a 15-year-old sophomore at Santa Fe when she was diagnosed with an undifferentiated sarcoma, a rare form of cancer that affects about 50 people worldwide annually.

The former Homecoming princess died Dec. 9 at age 16.

Read the rest at The Galveston County Daily News

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Changes in power assessed by the wingate anaerobic test following downhill running.

Nottle C, Nosaka K

J Strength Cond Res. 2007 Feb ; 21(1): 145-50

Nottle, C., and K. Nosaka. Changes in power assessed by the Wingate Anaerobic Test following downhill running. J. Strength Cond. Res. 21(1):145-150. 2007.-Few studies have examined the effects of eccentric exercise-induced muscle damage on power despite power being a key performance variable in a number of sporting events. The aim of this study was to examine changes in anaerobic power (30-second Wingate Test), isometric strength of the knee extensors and flexors, muscle soreness, and plasma creatine kinase (CK) activity following downhill running. Eight men performed a 40-minute downhill (-7%) run on a treadmill, and measurements were taken on 6 occasions (2 baseline and 0.5, 24, 72, and 120 hours postrun).

A second group of men (n = 5) had the measurements taken on 6 occasions without downhill running and served as a control group. A repeated measures analysis of variance revealed no significant changes in any measures across time for the control group. Following downhill running, significant (p < 0.05) decreases in strength (0.5-24 hours), and significant increases in muscle soreness (0.5-72 hours) and plasma CK activity (0.5-120 hours) were observed.

A significant decrease in peak and average power ( approximately 5%) was evident only 0.5 hours postrun, and the decrease was smaller in magnitude than that of strength ( approximately 15%). These results suggest that power is less affected than strength after eccentric exercise, and the effect of reduced power on sport performance seems negligible.

From HubMed Abstracts

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KC_JAKE posted a photo:

MIAA Track Meet 2007

Running tag from Flickr

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Top 10 Reasons Not To Run

Every runner or jogger has their special excuse not to run; in fact, most people who don’t run at all have their excuses too. Presented here are some of my favorite excuses why people don’t run. Whether it is a runner’s excuse to skip a day or a nonrunner’s excuse to not start running, here are ten of them and why they don’t hold water.

Read the reasons at about.com

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