Effects of Exercise and Training on Natural Killer Cell Counts and Cytolytic Activity

Effects of Exercise and Training on Natural Killer Cell Counts and Cytolytic Activity
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运动和训练对自然杀伤细胞计数和溶细胞活性的影响

DOI:
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发表时间:
1999
期刊:
影响因子:
9.8
通讯作者:
P. Shek
P. Shek
中科院分区:
医学1区
文献类型:
--
作者:
R. Shephard;P. Shek

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荟萃分析技术已被用来积累数据,从94项研究描述自然杀伤(NK)细胞反应的约900名志愿者急性和慢性运动。NK细胞数量以CD 3-CD 16 + CD 56+、CD 16+或CD 56+表型表示,溶细胞活性以每10 000个外周血单核细胞或裂解单位表示。急性运动可分为持续中度(50 - 65%的有氧运动能力)、持续剧烈(>75%的有氧运动能力)、短暂的最大或“超最大”运动、长时间、离心或抵抗运动和重复运动。一般来说,运动结束时NK细胞计数显著增加,这可能是由于儿茶酚胺介导的细胞脱边作用。运动后,细胞计数在几个小时内下降到正常水平的一半以下,但除非在不寻常的情况下(例如长时间,激烈和紧张的运动),正常的静息值在24小时内恢复。如果运动时间长且剧烈,NK细胞计数和细胞溶解活性的下降可能在运动期间开始。虽然NK细胞计数的通常抑制似乎太短暂,对健康没有重大的实际意义,但每周诱导这种变化几次的运动员的免疫监测和健康体验可能会产生累积的不良影响。有一个微弱的建议,抵消增加静息NK细胞计数和细胞溶解作用的训练的个人,这值得进一步探索的研究,最近的训练课程的影响是仔细控制。
Meta-analysis techniques have been used to accumulate data from 94 studies describing the natural killer (NK) cell response of some 900 volunteers to acute and chronic exercise. NK cell numbers have been indicated in terms of CD3-CD16+CD56+, CD16+ or CD56+ phenotypes, and cytolytic activity has been expressed per 10 000 peripheral blood mononuclear cells or in terms of lytic units. Acute exercise has been categorised as sustained moderate (50 to 65% of aerobic power), sustained vigorous (>75% of aerobic power), brief maximal or ’supramaximal’, prolonged, eccentric or resistance, and repeated exercise.In general, there was amarked increase in NK cell count at the end of exercise, probably attributable to a catecholamine-mediated demargination of cells. Following exercise, cell counts dropped to less than half of normal levels for a couple of hours but, except in unusual circumstances (e.g. prolonged, intense and stressful exercise), normal resting values are restored within 24 hours. If activity is both prolonged and vigorous, the decrease inNKcell counts and cytolytic activity may begin during the exercise session. Although the usual depression of NK cell count seems too brief to have major practical importance for health, there could be a cumulative adverse effect on immunosurveillance and health experience in athletes who induce such changes several times per week. There is a weak suggestion of an offsetting increase in resting NK cell counts and cytolytic action in trained individuals, and this merits further exploration in studies where effects of recent training sessions are carefully controlled.
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